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The immersive science of Audio Equipment, brought to you by {name}

Ariel Cabello

Powerful amplifier, you will need a good loudspeakers.
I wouldn't sell, but need to change for some smaller as we change place of living and we moved in to the apartment.


It’s been well over two years since I tested Yamaha s DSP A1000 Digital Sound Field Processing integrated amplifier (June 1991 Audio). Since then I have not come across a more versatile or effective single component that could provide as many home-theater and surround sound functions with such Stunning sonic impact. Until now! And not surprisingly, it is Yamaha that has outdone their earlier effort.


Physically, the new DSP-A2070 is almost indistinguishable from the earlier model (which, by the way, is still available). One big difference is the price, which is some $500 higher than that of the DSP-A1000. What, I wondered, had Yamaha done to justify this rather steep increase in price? After a hands-on comparison between the older unit and the new DSP-A2070, it didn’t take long to conclude that the in crease was fully justified. The DSP-A2070 provides three times the sound-field processing capabilities and nine times more early-reflection and reverberant sound- field data, and it calculates 64 times faster than the DSP-A1000. The result, to my ears and to others who heard the old and new products compared, was increased dialog intelligibility, greater separation between music, effects and dialog, and a larger, broader soundstage. After I outline the amplifier’s basic features, I’ll give a brief comparison between the features of the DSP-A2070 and the older model.


Like the earlier DSP-A 1000, the DSP A2070 is a seven-channel surround sound amplifier that provides digital sound-field processing and digital Dolby Pro Logic decoding with digital enhancements. It provides at least 80 watts each for the main (left, right, and center) channels, while the four effects channels (two front and two rear) get at least 25 watts apiece. A built-in test-tone generator provides a sequential sweep through the channels for use in establishing proper balance.


Control Layout

The upper half of the DSP-A2070’s all- black front panel houses the power switch, a “Tape 2 Monitor” switch, a rotary “Input Selector” and the “Volume” control, which is calibrated in dB from 0 dB (maximum) to -80 dB and then full off. A centrally positioned LCD display shows selected program names and parameters and information about a wide variety of settings and adjustments, with adjacent LED’s showing activation of the Pro Logic and “Sound- Field Processor” circuits.

Lowering a swing-down hinged panel reveals additional controls. These include an “Input Trim” rocker that adjusts input levels of each program source and also adjusts items selected by a “Set Menu” button. That button brings up seven different items for adjustment: Center mode, center graphic equalization, a low-frequency test, parameter initialization, memory lock, VCR3 video out (record out or monitor) and input level trim. A “program” rocker sequentially selects the digital sound-field processing programs, while an “Effect” switch turns the center and effects speaker channels on and off.

Along the lower section of the panel, and also hidden by the hinged swing-down flap, are a stereo headphone jack, a “Bass Extension” switch, bass, treble, and balance controls, a record output selector switch and a set of “Auxiliary” audio and video input jacks including an S-video connector.

In addition to duplicating the control functions found on the front panel, the supplied remote control offers buttons that adjust rear and center levels relative to main channel levels, on-screen display adjustments, and keys for operating other compatible Yamaha components. Yamaha supplies a couple of blank templates with which to cover the existing remote control labels. All the keys on this remote can be “taught” commands other than those pre set at the factory. Each key, in fact, can “learn” two different functions.

The rear panel of the DSP-A2070 is crammed full of jacks and speaker terminals. There are seven pairs of jacks for audio-only program sources (including “Tape 1” and “Tape 2” record-out jacks), eight sets of audio/video program jacks (including output jacks for three VCRs) plus a video-monitor output jack, with S video jacks for all video inputs and outputs. The eight Sets of speaker terminals include two main, four “Effects,” and two center- channel terminals; line-level “Mono” and “ Split” subwoofer jacks allow use of powered subwoofers or separate amplifiers powering passive subwoofers. There are also “Effects Out” jacks (for those who prefer to use separate amplifiers for surround channels), jacks for interconnection of preamp and main amp sections, and in/out jacks for the center channel. A small “Main Level” rotary control adjusts the main- channel line output level at the “Main Out” jacks. A “Front Mix” on/off switch, a center-speaker impedance switch, three a.c. convenience outlets (two switched, one Un-switched) and a ground terminal complete the rear panel’s layout.

Despite strong similarities between that description and my description of the DSP A1000 back in 1991, there are substantial changes and improvements in the new DSP-A2070. In place of the separate DSP and Dolby Pro Logic chips used in the older model, the DSP-A2070 uses a new LSI that incorporates both functions, plus two additional DSP chips; this setup replaces a huge signal-processing p.c. board used in the DSP-A 1000. The D/A and A/D converters are new, interpolative designs that pro vide the equivalent of 19-bit processing.

Eight different sound-field parameters are now adjustable including, for the first time, effect trim and independent front effect (presence) and rear effect (surround) delay times, reverberation percentage, and reverberation level. Parameters can be reset to their factory levels at the touch of a button, and a “Memory Guard” feature prevents unwanted changes to parameter settings.

= = = =

SPECS

Audio Section

Power Output (20 Hz to 20 kHz):

Main and center channels, 80 watts/channel into 8 ohms, 100 watts/ channel into 6 ohms; front and rear effects channels, 25 watts/ channel into 8 ohms, 30 watts/ channel into 6 ohms.

THD: Main and center channels, 0.015%; effects channels, 0.05%.

Damping Factor, Main and Center Channels: 120.

Input Sensitivity: High-level inputs, 150 mV; phono, 2.5 mV; main and center amp inputs, 1 V.

Maximum Input Signal (1 kHz, 0.05% THD): High-level inputs, 2.3 V; phono, 130 mV.

Maximum Preamp Output: 3 V.

Headphone Output Level: 0.19 V at 1 kHz, for 8-ohm load.

Frequency Response: 20 Hz to 20 kHz, ± 1.0 dB, via high-level and main amp inputs.

RIAA Equalization Deviation: ± 0.5 dB.

S/N: High-level inputs, greater than 96 dB; phono, greater than 86 dB.

Residual Noise: 150 uV.

Tone Control Range: Bass, ± 10 dB at 50Hz (350 Hz turnover frequency); treble, + 10 dB at 20 kHz (3.5 kHz turnover frequency).

Bass Extension: +7 dB at 70 Hz. Audio Muting: —20 dB.

Video Section

Video Input Levels (peak to peak):

Composite and S-video luminance, 1 V; S-video chrominance, 0.286 V; maximum, greater than 1.5 V.

Video Input Impedance: 75 ohms, all inputs.

Video S/N: 50 dB.

Video Frequency Response: 5 Hz to 10 MHz, +0, —3.0 dB.

General Specifications

Power Requirements: 120 V a.c., 60 Hz, 400 W.

Dimensions: 17¼ in. W X 6 4 in. H. x 18 in. D (43.5 cm x 17.05 cm x 46.85 cm).

Weight: 46.3 lbs. (21.0 kg). 

Very good - Number of items: 1 - Including: Solid state multi-channel receiver - Original user manual

Yamaha - DSP-A2070 - Solid state multi-channel receiver

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Very good - Number of items: 1 - Including: Turntable - Brochures, Case

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Kenwood - KA-4050R; DP 1080 Hi-fi set - Multiple models

Excellent - Number of items: 1 - Including: No extra's

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Good - Number of items: 6 - Including: Speaker set - Remote control

Bose - PS 3-2-1 - Home Cinema Set - 2.1 Speaker set

Good - Number of items: 1 - Including: Solid state stereo amplifier - Power cord

Marantz - PM-200 Solid state stereo amplifier

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Mint - Number of items: 1 - Including: Audio component - Remote control, Box, Power Adapter, + Extra item (see description)

Yamaha - Restio MusicCast ISX-80 Audio component

Good - Number of items: 1 - Including: Solid state integrated amplifier - Original user manual, Power cord, Remote control

TEAC - AX-501 Solid state integrated amplifier

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