What is stereo?




There are now two system of high fidelity, monophonic (monaural) and stereophonic. Monophonic is a system that starts from one microphone and is fed through a single high fidelity set. Stereophonic is a double system. Two separate microphones are placed at different sides of the orchestra and two different systems are used to keep the two signals or channels separated. Two separate speakers are used, placed on different sides of you room. Stereo is much like 3-D photography, two slightly different sound reach your ears giving you a new dimension in sound.




H.H. Scott '59





B&W DM 560

 
DM560  Stand-mount/Bookshelf loudspeaker system
Product Summary
The two way front vented system encompasses the same design technology of the DM550 with its rigid one-piece baffle construction, but offers a noticeable extended bass – thanks to a bigger 8in bass/midrange driver and increased enclosure size.
 
Technical highlights
B&W's Tweeter technology ensures that the sound remains focused and time sensitive and that the stereo image is presented with unparalleled three dimensional accuracy. The cabinets feature a specially designed high density front baffle which achieves almost Matrix-like stability in strengthening overall enclosure construction. The bevel edges of the front moulding reduce diffraction and improve dispersion. The crossover components use heavy gauge wire throughout and new drivers guarantee not only high reliability but ensure that top specifications are met.

Specyfications
Drive Units 560
1 x 26 mm high-frequency with aluminium dome, 26 mm coil on aluminium dome former, wound with polymide resin and heat cured
1 x 200 mm bass/midrange with composite short fibre cone, 26 mm coil on high temperature former, wound with polymide resin and heat cured
Frequency Response:  65 Hz – 20 kHz ±2.5 dB on reference axis
Sensitivity:  90 dB spl(2.83V 1m)
Nominal Impedance:  8Ω
Power Handling:  10 W – 75 W into 8Ω on unclipped programme
Dimensions (W x H x D):  236 x 490 x 302 mm
Finish:  Black ash or walnut vinyl

B&W DM 570


DM570  Stand-mount/Bookshelf loudspeaker system
Product Summary
The DM570 construction consists of a one piece moulded baffle design – in which components are exactly appropriate to the size and expected performance. A performance guided to perfection through the use of CAD, finite element analysis and laser interferometry techniques. The two-way front vented system has a specially designed 8in bass/midrange driver of the highest sophistication incorporating a high temperature Kapton voice coil which effectively winds up to increase power handling.
 
Technical highlights
B&W's Tweeter technology ensures that the sound remains focused and time sensitive and that the stereo image is presented with unparalleled three dimensional accuracy. The cabinets feature a specially designed high density front baffle which achieves almost Matrix-like stability in strengthening overall enclosure construction. The bevel edges of the front moulding reduce diffraction and improve dispersion. The crossover components use heavy gauge wire throughout and new drivers guarantee not only high reliability but ensure that top specifications are met.

Specifications
Drive Units 570
1 x 26 mm high-frequency with aluminium dome, 26 mm coil on aluminium dome former, wound with polymide resin and heat cured
1 x 200 mm bass/midrange with composite short fibre cone, 3 0mm coil onKapton former, wound with polymide resin and heat cured
Frequency Response:  55 Hz – 20 kHz ±2.5 dB on reference axis
Sensitivity:  91 dB spl(2.83V 1m)
Nominal Impedance:  8Ω
Power Handling:  10 W – 120 W into 8 Ω on unclipped programme
Dimensions (W x H x D):  236 x 634 x 302 mm
Finish:  Black ash or walnut vinyl


McIntosh MX 117


 
The MX 117 AM-FM Stereo Tuner-Preamplifier concept is a total Mclntosh master control center that allows you to select the matching Mclntosh power amplifier for your individual requirements. All needed inputs such as two record players, two tape recorders and auxiliary can be accommodated, along with the built-in AM-FM stereo tuner. The advanced circuits and performance features of the Mclntosh MX 117 make it an ideal and especially convenient solution for the most discriminating stereo listener.
FM AFL AUTOMATIC FREQUENCY LOCK
The Automatic Frequency Lock is a patented Mclntosh circuit that activates when you tune to the center frequency of an FM station. A varacter diode fine tunes the tuner with a correction voltage from the AFL circuit. When the center ON -station vertical LED indicator lights, the AFL circuit is in operation and the tuner stays locked to the signal. There will be no drift from this accurate tuning, insuring minimum distortion and best overall FM performance.
2. ELECTRONIC FET ANALOG INPUT SWITCHING
All critical input switching is done electronically using field effect transistor analog switches. The front panel selector simply switches small amounts of control DC voltage which turn the FET analog switches on or off. Since the FET analog switches are located near the input jacks, the length of interconnecting leads is much shorter. This design eliminates switching noise as well as frequency loss caused by the longer signal leads necessary in conventional circuits.
3. HEADPHONE—OUTPUT AMPLIFIER
The built-in headphone amplifier is capable of driving a pair of dynamic headphones with less than 0.02% harmonic distortion. Because of its extremely low distortion and power capability, it is also the main preamplifier output.
4. TRI-FREQUENCY PROGRAM EQUALIZER
Three separate controls allow the balance and response of musical information to be adjusted with far more flexibility than with conventional tone controls. The center frequencies of the controls are 30 Hz, 750 Hz and 10 kHz. Plus and minus 12 dB of control is available. Use of the program equalizer controls does not affect in the slightest the low noise, low distortion performance of the tuner-preamplifier. When the equalizer controls are in their center detent or flat position, their action is neutral and response of the tuner-preamplifier is absolutely flat.
5. TRUE LOUDNESS COMPENSATION
The MX 117 active circuit loudness control is continuously variable with constant midrange gain and operates independently of the volume control. The loudness contour is accurately modeled after the Fletcher Munson family of "Equal Loudness" curves. Use of this control restores proper perceived frequency response at even the softest listening levels.
5. TRUE LOUDNESS COMPENSATION
The MX 117 active circuit loudness control is continuously variable with constant midrange gain and operates independently of the volume control. The loudness contour is accurately modeled after the Fletcher Munson family of "Equal Loudness" curves. Use of this control restores proper perceived frequency response at even the softest listening levels.
5. TRUE LOUDNESS COMPENSATION
The MX 117 active circuit loudness control is continuously variable with constant midrange gain and operates independently of the volume control. The loudness contour is accurately modeled after the Fletcher Munson family of "Equal Loudness" curves. Use of this control restores proper perceived frequency response at even the softest listening levels.
6. PRECISION TRACKING VOLUME CONTROL
The volume control manufactured for Mclntosh Laboratory is a step attenuator which has tracking accuracy within 1 dB throughout its entire range. Such extremely accurate matching is achieved through electronically controlled trimming of the resistance material deposited on pairs of miniature printed circuits. Tracking accuracy and quiet performance are permanently maintained.
Use does not affect performance as in ordinary volume controls.
7. ELECTRONIC FET RF SELECTIVITY SWITCHING
A back panel switch gives additional FM RF selectivity for best performance in areas with extremel strong station signal strengths. This switch feeds a control DC voltage to PIN semiconductor diodes which electronically perform the RF switching functions.
AUTOMATIC STEREO NOISE SUPPRESSION
A new third generation phase locked loop stereo decoder incorporates a unique variable stereo separation - noise reduction control circuit. This circuit operates from the IF amplifier signa strength detector. When listening to weak or distant FM stations, optimum stereo separation and signal to noise ratio is automatically provided. You get a smooth transition between stereo and mono depending on the prevailing signal conditions. This means that with the Mclntosh MX 117 you always get the most noise-free reception of weaker stereo signals. Since this circuit automaticallyadjusts in varying amounts, you never hearthe abrupt switching present in conventional circuits.
UNIQUE AM TUNER SECTION
The AM circuit in the MX 117 is unique in designfor a superheterodyne tuner. The AM RF amplifier circuit has constant selectivity, constant sensitivity and high image rejection across the complete AM band. In addition there is no loss of audio frequency response at the low end of the band. No conventional AM circuit can offer all these features simultaneously. These advanced AM performance characteristics of the MX 117 bring about a re-discovery of AM listening.
INTEGRATED CIRCUIT OPERATIONAL AMPLIFIERS
Both the magnetic phono and the equalizer amplifierstages utilize new high technology integrated circuit operational amplifiers. Noise factors are incredibly low and distortion levels are at or below the limits of the best present day test equipment.


PREAMP SECTION
FREQUENCY RESPONSE:  + 0 - 0.5 db from 20 Hz to 20 kHz
RATED OUT PUT LEVELS
Main Out : 2.5V
Line Out : 1.25V
Headphone : 750mV
Tape Out : 250mV
DISTORTION:  0.02% maximum at 2.5V output from 20 Hz to 20 kHz
INPUT SENSITIVITY AND GAIN
Input to Main Out
Phone 1 and 2:  2.2mV in for 2.5V out (61.1 dB gain at 1 kHz)
AUX, Tape 1 and 2: 250mV in for 2.5V out (20 dB gain at 1 kHz)
Input to Line Out
Phono 1 and 2 : 2.2mV in for 1.25V out (55 dB gain at 1 kHz)
AUX, Tape 1 and 2 : 250mV in for 1.25V out (14 dB gain at 1 kHz)
Input to Headphone Out
Phono 1 and 2:  2.2mV in for 750mV out (50.7 dB gain at 1 kHz)
AUX, Tape 1 and 2 250mV in for 750mV out (9.5 dB gain at 1 kHz)
Input to Tape Out
Phono 1 and 2:  2.2mV in for 250mV out (41.1 dB gain at 1 kHz)
AUX, Tape 1 and 2:  25pmV in for 250mV out (0 dB gain at 1 kHz)
SIGNAL TO NOISE
Phono 1 and 2:  -90 dB IHF A-weighted, below 10mV input -80 dB unweighted, below 10mV input
AUX, Tape 1 and 2:  - 100 dB IHF A-weighted, below 250mV input
-90 dB unweighted, below 250mV input
INPUT IMPEDANCE
Phono 1 and 2:  47kl2 and 50pF
AUX, Tape 1 and 2:  47kohm
OUTPUT IMPEDANCE
Main Out:  less than 100ohm (to operate into 5kohm or greater)
Line Out:  600ohm (to operate into a 600ohm line)
Headphone:   8ohm
Tape Out:  less than 200ohm (to operate into 5kohm or greater)
EQUALIZER CONTROL RESPONSE
Center Frequencies :  30, 750, and 10 kh
Boosr and Cut:  ± 12 dB

AM SECTION
SENSITIVITY.  75μV IHF with external antenna
SIGNAL TO NOISE RATIO:  45 dB minimum IHF or 55 dB at 100% modulation
FREQUENCY RESPONSE:  + 0 ~ 6 dB from 20 Hz to 3500 Hz
HARMONIC DISTORTION:  0.8% maximum at 30% modulation
ADJACENT CHANNEL SENSITIVITY:  30 dB minimum IHF
IMAGE REJECTION:  65 dB minimum from 540 kHz to 1600 kHz
FM SECTION
USABLE SENSITIVITY:  2μV (11.2dBf) IHF
QUIETING SENSITIVITY:  5μV(19.1dBf) IHF -50dB(Mono);  50μV (39.5dBf) IHF -50 dB (Stereo)
SIGNAL TO NOISE RATIO  :70 dB IHF minimum both Mono and Stereo
HARMONIC DISTORTION
0.18% (Mono) IHF maximum
0.38% (Stereo) IHF maximum
ALTERNATE CHANNEL SELECTIVITY:  75 dB IHF minimum
IMAGE REJECTION:  100 dB IHF minimum
STEREO SEPARATION:  45 dB minimum at 1 kHz

GENERAL INFORMATION
POWER REQUIREMENT:  120 Volts 50/60 Hz, 45 Watts
SEMI CONDUCTOR COMPLEMENT
24 Bipolar Transistors
18 Field Effect Transistors
62 Diodes
24 Integrated Circuits
MECHANICAL
MECHANICAL INFORMATION
SIZE
Front panel measures 16 inches wide (40.6 cm) by 5 7/16 inches high (13.8 cm). Chassis measures 14 3/4 inches wide (37.5 cm) by 4 13/16 inches high (12.2 cm) by 13 inches deep (33 cm), including connectors. Knob clearance required is 1 1/4 inches (3.2 cm) in front of mounting panel.
FINISH:
Front panel is anodized gold and black with special  gold/teal nomenclature illumination. Chassis is black.
MOUNTING::  Exclusive Mclntosh developed professional PANLOC.
WEIGHT::  24 pounds (10.9 kg) net, 36 pounds (16.3 kg) in shipping carton.


Altec Lansing 605B

ALTEC 605B DUPLEX
Altec ''Duplex'' Loudspeakers are two-way transducers, consisting of independent high and low frequency units, mounted within one physical frame, to provide the quality advantages of a professional two-way speaker system in compact form. The efficiency, power handling capacity, and extremely wide response of these units make them an ideal choice for both single-source (high-level) and distributed(low-level) sound system. The 605B provides minimal distortion, wide range, smooth response, and excellent distribution characteristics to assure perfect audio reproduction of speech and music for all PA, sound reinforcement or background music installations and for high quality monitoring of broadcast and recording material.
Each 605B 'Duplex' Loudspeaker is supplied with a professional-type, fullsection dividing network, incorporating a high-frequency balance control for correctly matching or adjusting to the acoustical characteristics of individual listening areas.
The 605B 'Duplex' - one of the finest 15-inch, full-range loudspeakers in use throughout the audio industry - has, for years, been the accepted standard monitor loudspeakers of major broadcast and recording studios, The 605B covers the audio range from 20 to 20,000 Hz. The exceptional uniformity of response is due, in part, to the large, edge-wound voice coils (aluminum in the high-frequency section and copper in the low-frequency section), operating in magnetic gaps of high flux density, produced by independent oversize Alnico V magnets. The large 2¼'' aluminum high-frequency diaphragm has tangential compliance, and is coupled to a heavy, high-impact, compression-molded multicellular horn. It provides outstanding sound distribution and clarity of the higher musical harmonics - without annoying resonant 'peaks' or 'hollows' which produce undesirable sound cancellation. A combination of phasing plug and pole piece, precision-machined with two acoustically exponential annular slots, assures correct phase relationship between the center and outer edge of the HF diaphragm. The high compliance low-frequency cone, driven by the large 3'' copper voice coil, reproduces the lowest fundamental bass tones without frequency doubling of 'bottoming' - even at full rated power.
Specifications
Power: 35 watts (50 watts, peak)
Frequency Response: 20 – 20,000 hZ
Pressure Sensitivity: 97 dB SPL at 4 ft from watt (equal to EIA rating of 50dB at 30' from 1 mw or 112,4 dB 30' from 1 mw) or 112,4 dB SPL at 4 ft from 35 watts
Impedance: 16 ohms
Cone Resonance: 25 Hz
Voice Coil Diameters: LF : 3 inches, HF : 1¾ inches
Horizontal Distribution: 90°
Vertical Distribution: 40°
Magnet Type: Alnico V
Weight: LF : 2,25 pounds
HF : 0,531 pound
Structure Weight: LF : 15.13 pounds
HF : 5 pounds
Flux: LF : 11,000 Gauss
HF : 14,000 Gauss
Crossover Network: 1,600 Hz full-section (furnished with loudspeaker)
Terminals: Binding Post (4)
Diameter: 15-5/16 inches
Mounting Data: Baffle Opening 13-5/8inchs, Mtg. Bolt. Cntrs.: 8 holes equally
spaced on 14-9/16 diameter circle
Depth: 19 inches
Weight: 28 pounds




Altec Lansing 620B



The Altec 620B Speaker Cabinet is a smartly styled , furniture-type, bassreflex enclosure designed for front mounting a 15'' loe-frequency or two-way coaxial loudspeakers. The 620B provides correct baffling and mounting for quality monitor installations. The cabinet's appearance is enhanced by an appealing, natural, hand-rubbed oil finish on rift-cut oak, and an attractive, snap-on, removable grille assembly.
Architect's and Engineer's Specifications
The speaker cabinet shall be the bass reflex type, and shall provide front mounting for 15'' speakers onl. The cabinet shall meet the following criteria. Grille assembly, snap-on. Grille cloth, brown. Internal volue, 9,0 ft³. Dimensions, 40'' x 26'' x 18'' (HxWxD). Weight, 104 pounds. Finish, handrubbed oil on rift-cut oak.
Specifications
Type: Bass reflex enclosure
Pressure Sensitivity: 100 dB SPL at 4' with Altec 604-8 K loudspeaker when measured on axis with 1 watt input of band-limited pink noise from 100 to 10,000 Hz and calculated to 4' equivalent (Ref.: 0dB = 0,0002 dyne/cm²
Speaker Accommodations: 15'', front-mounted
Internal Volume: 9,0 ft³
Dimensions (W x H x D): 660 x 1016 x 457 mm (26'' x 40'' x 18'')
Weight: 47,2 kg (104 pounds), enclosure only
Finish: Hand-rubbed oil on rift-cut oak. Brown grille cloth
Recommended Altec Speaker: 605B Duplex Loudspeaker

EMT 938 Broadcast Disk Reproducer


 EMT 938 Features
Robust Tone Arm
Simple and Rational Operation
High Immunity to Vibrations with Effective Shock Absorber System
Direct Drive with Quick Start
Three Speedes: 33, 45, 78 rpm
High-Quality Amplifiers

The mains power switch, speed selector switch, Start/Stop button, and button for the tone arm lift comprise the operating elements of the EMT 938 BDR (Broadcast Disk Reproducer). Both Start and  i.e., run-up of the turntable platter and platter braking, are accomplished in less than 500 milliseconds. The unit cantherefore be started precisely at any syllable in the groove.
To facilitate locating a desired point on the record (such as the beginning of the modulation, or a specific cueing point), theplatter rim extends 2,4 cm beyond the edge of an LP, enabling the record platter to be turned back and forth by hand. A phone jack is provided for connecting stereo headphones.

 The EMT 938 BDR is now equiped with a synchronization indicator, which illuminates as soon as the started turntable platter has reached the selected speed.


 The front view shows the level controls of the audio amplifiers. The insertion of a pre-preamplifier for moving coil pickup cartridges is indicated by a coloured dot.

Jacks for external connections are located on the rear side of the EMT 938 BDR. Printed legends identify the functions of the jacks.


Specifications
Deck
Turntable Diameter:  330 mm
Turntable Speeds:  78 rpm, 45 rpm, 33 1/3 rpm
Accuracy of turntable speed:  Quartz controlled, max. ±0,1%
Speed Variation with VCD Operation:  ±25 %
Run-up Time at Tamb = 20°C
Quick Start:  max. 200 msec
Wow and Flutter:  max. ±0,075% (at 33 1/3 rpm measured with EMT 424, weighted in accordance with DIN 45507/IEC)
Rumble (measured in accordance with DIN 45 539 with test record DIN 45 544):
Unweighted : min. 50 dB
Weighted : min. 70 dB
Amplifier Section
Equalization (DIN,NAB, IEC):  75/318/3180 µsec 
Frequency Response:  40 Hz to 15 kHz ±0,5 dB;  30 Hz approx. -3 dB below 30 Hz approx. 20 dB/octave rolloff above 25 kHz approx. 12 dB/octave rolloff
Input Voltage
For magnetic Hi-fi  cartridges:  2  to 10 mV (version with Ri =47 kohms)
For dynamic cartridge:  0,3 to 1,4 mV (with active impedance transformer, gain = 17 dB)
Overload margin of the Input:  20 dB above nominal level
Output Voltage:  +6 dB (1,55 V) max. 10 V on 200 ohms
Harmonic Distortion:  max. 0,2%,  30 Hz to 12 kHz, at =15 dB (4,4 V) 0n 200 ohms
Crosstalk Supression:  min. 50 dB ,  30 Hz to 15 kHz
S/N Ratio RMS
Unweighted Peak : min. 70 dB
Weighted  : min. 64 dB (in accordance with CCIR 468-2)
Mono Switching:  Remote controllable
Headphone Outputs Mono and Stereo (200 Ohms):  0,5 to 2 V, unbalanced

General
Switchable for mains voltage of 100 to 120 V, 200 to 240 V, 50 Hz or 60 Hz
Power Consumption:  max. Approx. 85 VA (normally approx. 40 VA)
Dimensions (W x D x H):  500 x 440 x 195 mm (19,7" x 17,3" x 7,7")
Weight:  approx. 25 kg (55,12 lbs)

ADC XLM Mk II



The XML MkII Improved shares many of the virtues of the XLM MkIII Improved. Including excellent tracking ability and channel separation, high definition of musical passages and low record wear, plus the revolutionary Omni-Pivot System. The XLM MkII Improved also features a Diasa stone; a highly polished elliptical diamond tip fused to a sapphire base. Low effective tip mass is achieved by mounting the Diasa stone to a non-tapered hollow tube cantilever. The XLM MkII … a sound investment.

Specifications
Frequency Response:  15 Hz - 24 kHz ±1,5dB
Sensitivity:  0,9 mV/cm/sec.
Channel Balance:  1 dB
Channel Separation:  26 dB at 1 kHz;  15 dB at 10 kHz
Inductance:  350 mHy
Resistance:  625 ohms
Load Resistance:  47 kohms
Tracking Force:  ¾ - 1½ grams
Stylus Assembly:  Nude Diasa, Elliptical .0003" x .0007"Diamond, mounted to a hollow cantilever.
Cartridge Body Color:  Black and Gold
Stylus Color:  Black
Shielding:  Annealed MuMetal Case
Cartridge Weight:  5,75 grams

ADC QLM 36 - 34 Mk III



The ADC QLM 34 Mk III Series
The QLM 34 Mk III Series cartridges offer the hi-fi listener maximum stereo performance with minimum record wear. Of course they all feature ADC's patented Induced Magnat design for ultra low effective tip mass. It's high quality sound for a low investment.

Specifications
Frequency Response:  20 Hz - 20 kHz ±2dB
Channel Separation:  24 dB at 1 kHz;  15 dB at 10 kHz
Tracking Force:  1,5 to 3,0 grams
Stylus Assembly:  Bushed, Elliptical .0003" x .0007"Diamond, mounted to a hollow cantilever.
Cartridge Weight:  5,75 grams


The ADC QLM 36 Mk III Improved cartridge utilizes many of the sophisticated design concepts of the XLM Mk II Improved: the patented ADC Induced Magnet design, long life Omni-Pivot System, and a low mass Diasa tip. These features and more make the QLM 36 Mk III a great buy at a moderate price.

Specifications
Frequency Response:  15 Hz - 20 kHz ±2dB
Channel Separation:  24 dB at 1 kHz;  15 dB at 10 kHz
Tracking Force:  1,2 gram ±0,3 gram
Stylus Assembly:  Nude Diasa, Elliptical .0003" x .0007"Diamond, mounted to a hollow cantilever.
Cartridge Weight:  5,75 grams


Marantz Model 2230


 MARANTZ MODEL 2230 AM/FM STEREO RECEIVER
With impressive specifications and Marantz-exclusive features, the low-prieced Model 2230 offers more value and performance than any other receiver in its class. It delivers 60 watts continuous RMS into 8 ohm speakers from 40 Hz to 20 kHz with total harmonic and intermodulation distortion under 0,5%. Frequency response is ±0,5 dB. Stepped, three-zone controls for Bass, Mid, Treble. Provisions for tape decks, phones, record changers, 4-channel adaptors. Ultra low-distortion FET, RF and IF circuitry. Massive heat sinks; automatic protection for internal circuitry and associated speakers, plus the famous Marantz gold-anodized front panel. Completely enclosed metal chassis finished in simulated walnut or with optional WC-22 walnut cabinet.



Specifications
Tuner Section
FM Quieting Slope
RF Input for 30 dB Quieting : 2,0 µV
Quieting at 5µV RF Input : 53 dB
Quieting at 10µV RF Input : 57 dB
Quieting at 50µV Rf Input : 63 dB
Total Harmonic Distortion Stereo/Mono:  0,30%/0,15%
Selectivity (Alternate Carrier):  60 dB
Capture Ratio:  2,5 dB
Stereo Separation (at 1kHz):  42 dB
Spurious Rejection:  90 dB
Image Rejection:  70 dB
AM Suppression:  50 dB
IF Rejection:  90 dB
AM Sensitivity:  20 µV
Preamplifier Section
Dynamic Range Phono (ratio of input overload voltage to equivalent noise):  96 dB
Phono Sensitivity (for rated output):  1,8 mV
Phono Equivalent Noise Input:  1,5 µV
High Level Input Sensitivity:  180 mV
Preamplifier Output level:  1,0 V
Headphone Output Level:  1,0  V
Tone Controls:
Bass (50 Hz):  ±15 dB
Mid (700 Hz):  ±6 dB
Treble (15 kHz):  ±15 dB
Power Amplifier Section
Power Output RMS:  60 Watts (at 8Ω, both channels driven, at or below rated distortion, 20Hz to 20kHz)
Intermodulation Distortion:  0,5% (at or below rated power, any combination of two frequencies, 20Hz to 20kHz)
Total Harmonic Distortion:  0,5% (at or below rated power, any frequency from 20Hz to 20kHz)
Frequency Response:  20 Hz - 20 kHz ±0,5 dB
Power Bandwidth (IHF both channel driven):  15 Hz to 50 kHz
Basic Amplifier Input Sensitivity /Impedance:  1 V/47 kΩ
Damping Factor:  50
Power Supply: 110/120/220/240 V 50/60 Hz
Dimensions :  16 x 5 x 14 inch
Weight:  40 lbs

Marantz Model 2220


 MARANTZ MODEL 2220 AM/FM STEREO RECEIVER
Traditional marantz quality and high performance make the exciting Model 2220 a lot of receiver for little money. With utmost reliability, it offers 40 watts continuous RMS into 8 ohm speakers, from 40 Hz to 20 kHz with total harmonic and intermodulation distortion less than 0,9%. Frequency response is an amazing ±1 dB. The professional preamp control section includes provisions for record changer, tape decks, phones, etc.,  plus precision over virtually every audio variable. Behind the Model 2220's gold-anodized front panel are: low-noise, low-distortion FET, RF and IF circuitry; massive heat sinks; and automatic protection for internal circuitry and associated speakers. Completely enclosed metal chassis is finished in simulated walnut.



Specifications
Tuner Section
FM Quieting Slope
RF Input for 30 dB Quieting : 2,1 µV
Quieting at 5µV RF Input : 50 dB
Quieting at 10µV RF Input : 56 dB
Quieting at 50µV Rf Input : 60 dB
Total Harmonic Distortion Stereo/Mono:  0,50%/0,30%
Selectivity (Alternate Carrier):  50 dB
Capture Ratio:  3,0 dB
Stereo Separation (at 1kHz):  40 dB
Spurious Rejection:  65 dB
Image Rejection:  50 dB
AM Suppression:  45 dB
IF Rejection:  60 dB
AM Sensitivity:  26 µV
Preamplifier Section
Dynamic Range Phono (ratio of input overload voltage to equivalent noise):  93 dB
Phono Sensitivity (for rated output):  2,1 mV
Phono Equivalent Noise Input:  2,2 µV
High Level Input Sensitivity:  150 mV
Headphone Output Level:  0,7 V
Tone Controls:
Bass (50 Hz):  ±12 dB
Treble (15 kHz):  ±12 dB
Power Amplifier Section
Power Output RMS:  40 Watts (at 8Ω, both channels driven, at or below rated distortion, 20Hz to 20kHz)
Intermodulation Distortion:  0,9% (at or below rated power, any combination of two frequencies, 20Hz to 20kHz)
Total Harmonic Distortion:  0,9% (at or below rated power, any frequency from 20Hz to 20kHz)
Frequency Response:  20 Hz - 20 kHz ±1 dB
Power Bandwidth (IHF both channel driven):  15 Hz to 50 kHz
Damping Factor:  45
Power Supply: 110/120/220/240 V 50/60 Hz
Dimensions :  16 x 5 x 14 inch
Weight:  35 lbs

Kenwood KR-3090


 KR-3090 AM/FM STEREO RECEIVER
This units features wide band power with the same low distortion amplifier and high performance FM tuner you expect from Kenwood
Features:
26 watts per channel, Min. RMS both channels driven at 8 ohms, 20 - 20,000 Hz, with no more than 0,05% THD
Direct-coupled pure complementary amplifier circuit
Quietest phono section in its class: 83 dB S/N
3-gang tuning capacitor and FET front end for high FM sensitivity (2.0 µV ) with low distortion
PLL in FM Multiplex for improved stereo separation
Large signal strength and FM centre-tune meters
FM Auto Muting
Connetions for 2 pairs of speakers
Natural low-boost only loudness control
Tape monitor
Optional CB-11K walnut veneer cabinet, B-11 walnut veneer side panels, or D-5 carrying handles available.



Specifications
Min. RMS Power Output:  26 watts per channel (at 8 Ω, 20-20,000 Hz)
Total Harmonic Distortion:  no more than 0,05%
IM Distortion (at reted power):  0,05%
Damping Factor (at 8 Ω):  40
Imput Sensitivity:
Phono : 5,0 mV/ 120 mV
Aux, Tape : 150 mV
Signal-to-Noise Ratio:
Phono : 83 dB
Aux, Tape : 100 dB
FM Tuner Section
Sensitivity at 30 dB Quieting:  2,0µV  (11,2 dBf)
Sensitivity at 50 dB Quieting
Mono : 3,3µV (15,6 dBf)
Stereo : 35µV (36,1 dBf)
Max. Quieting
Mono : 76 dB
Stereo : 72 dB
Total Harmonic Distortion
Mono : 0,2%
Stereo : 0,3%
Capture Ratio:  1,4 dB
Alternate Channel Selectivity:  54 dB
Stereo Separation:  43 dB at 1 kHz; (35 dB at 50 - 10 kHz)
General
Inputs / Outputs:  Phono, Aux, Tape / 2 Speakers, Phones
Dimensions (W x H x D):  18-7/16 x 5-1/2 x 13-11/16 inch
Weight:  16,5 lbs

Kenwood KR-2090


 KR-2090 AM/FM STEREO RECEIVER
The lowest distortion of any receiver in its class and full power down to 20 hz. Overall performance you would expect in a much higher-priced receiver.
Features:
16 watts per channel, Min. RMS both channels driven at 8 ohms, 20 - 20,000 Hz, with no more than 0,05% THD.
Quietest phono section in its class: 83 dB S/N
3-gang tuning capacitor and FET front end for high FM sensitivity (2.0 µV ) with low distortion
PLL in FM Multiplex for improved stereo separation
Large center-channel AM/FM tuning meter
FM Auto Muting
Connetions for 2 pairs of speakers
Natural low-boost only loudness control
Tape monitor
Optional CB-11K walnut veneer cabinet, B-11 walnut veneer side panels, or D-5 carrying handles available.


Specifications
Min. RMS Power Output:  16 watts per channel (at 8 Ω, 20-20,000 Hz)
Total Harmonic Distortion:  no more than 0,05%
IM Distortion (at reted power):  0,05%
Damping Factor (at 8 Ω):  30
Imput Sensitivity:
Phono : 5,0 mV/ 120 mV
Aux, Tape : 150 mV
Signal-to-Noise Ratio:
Phono : 83 dB
Aux, Tape : 100 dB
FM Tuner Section
Sensitivity at 30 dB Quieting:  2,0µV  (11,2 dBf)
Sensitivity at 50 dB Quieting
Mono : 3,3µV (15,6 dBf)
Stereo : 35µV (36,1 dBf)
Max. Quieting
Mono : 76 dB
Stereo : 72 dB
Total Harmonic Distortion
Mono : 0,2%
Stereo : 0,3%
Capture Ratio:  1,4 dB
Alternate Channel Selectivity:  54 dB
Stereo Separation:  43 dB at 1 kHz; (35 dB at 50 - 10 kHz)
General
Inputs / Outputs:  Phono, Aux, Tape / 2 Speakers, Phones
Dimensions (W x H x D):  18-7/16 x 5-1/2 x 13-11/16 inch
Weight:  15,9 lbs

Rotel RX-800


 All Solid State Design with Silicon Output Transistors.
Split Power Supply and Direct Coupling Circuitry.
Superb FET Front End Tuner
Rotary Controls;  Dual Bass, Dual treble, Mode, Function Selector, Balance, Volume and Tuning.
Push Buttons;  Power, Dimmer, Speaker  1 and 2, Tone Defeat, Low Filter, High Filter, Loudness, Tape Monitor 1 and 2, Audio Muting and FM Muting.
Extra wide and linear Dial Scale.
Illumunated AM/FM Signal Strength Tuning Meter.
Illumunated FM Center Tuning Meter.
Illuminated Dial Pointer and stereo Beacon.
Function Indicator Lights.
Front Panel Headphone jack.
Pre-Amp Outputs and Main-Amp Inputs.
Connections for 2 Record Players and 3 Tape Recorders.
Handsome Wood Cabinet

Above model produced in Japan, below the European version



Specifications
Amp Section
Total Music Power (IHF):  180 W (4 ohms); 125 W (8 ohms)
Continuous Power (RMS):  60 W (4 ohms); 40 W (8 ohms) both channel driven at less than 0,5% THD
Harmonic Distortion:  less than 0,3% (at 40 W, 20 - 20,000 Hz)
IM Distortion: less than 0,2% at 40 W per Channel
Frequency Response:  4 - 75,000 Hz
Power Bandwidth (IHF):  5 - 50 Hz
Speaker Impedance:  4, 8, 16 ohms
Tuner Section
Sensitivity (IHF)
FM :  1,7µV
AM : 20µV
Harmonic Distortion: less than 0,5%
S/N Ratio:  65 dB
IF Rejection (FM) :  100 dB
AM Image Rejection:  75 dB
Stereo Separation:  38 dB
General
Power Voltage:  AC 100, 117, 220, 240 V, 50/60 Hz
Dimensions (W x H xD):  18" x 5½" x 13¾"
Weight:  12 kg (26,4 lbs)

Rotel RX-600A


 All Solid State Design with Silicon Output Transistors.
Split Power Supply and Direct Coupling Circuitry.
FET Front End Tuner.
Ceramic Filter and Integrated Circuit
Rotary Controls;  Speakers, Dual Bass, Dual treble, Function Selector, Balance, Volume and Tuning.
Push Buttons;  Power, Muting, Tone Defeat,Mode, High Filter, Loudness, Tape Monitor .
Illumunated AM/FM Signal Strength Tuning Meter.
Illumunated FM Center Tuning Meter.
Illuminated Dial Pointer and Dial Board.
Stereo Indicator and Function Indicator Lights.
Front Panel Headphone jack.
Rear Panel Speaker Matrix Switch for simulated 4-channel.
Pre-Amp Outputs and Main-Amp Inputs.
Connections for 3 Record Players and 2 Tape Recorders.
Handsome Wood Cabinet

Above model produced in Japan, below the European version


Specifications
Amp Section
Total Music Power (IHF):  140 W (4 ohms); 100 W (8 ohms)
Continuous Power (RMS):  45 W (4 ohms); 30 W (8 ohms) both channel driven at 0,2% THD
Harmonic Distortion:  0,2%
IM Distortion:  0,2%
Frequency Response:  9 - 100,000 Hz
Power Bandwidth (IHF):  15 - 45 Hz
Speaker Impedance:  4, 8, 16 ohms
Tuner Section
Sensitivity (IHF)
FM :  2,2µV
AM : 30µV
Harmonic Distortion: less than 0,5%
S/N Ratio:  65 dB
IF Rejection (FM) :  70 dB
Image Rejection (AM) :  40 dB
Stereo Separation:  better than 35 dB
General
Power Voltage:  AC 100, 117, 220, 240 V, 50/60 Hz
Dimensions (W x H xD):  18" x 5¹/₁₂" x 12¹/"
Weight:  8,9 kg (19,6 lbs)