YAMAHA DSP-A1000 DIGITAL SOUND FIELD PROCESSING AMPLIFIER

YAMAHA DSP-A1000
Made in Japan 1991. Technically, this is a early 5.1 surround processing amplifier. 100 watts per channel at 6 ohms (80 watts per channel at 8 ohms). High end audiophile specs with SUPER low 0.015% THD and huge 120 damping factor for bone crushing bass control! 10 analog audio inputs (including phono) with 4 out (including tape monitor). 5 composite/SVHS video inputs with 3 out. Preamp/power amp loops for left/right/center channels. Subwoofer pre out. Center channel pre out. Front and rear effects out. The amp is HUGE, has a massive power supply section, built like a tank.

IN DETAIL
Dolby Pro Logic system uses digital circuitry, with an automatic input-level balance control that maintains optimal surround-sound settings. The front panel has only two visible knobs (volume and the input selector), a power pushbutton, a tape-monitor button (labeled tape 2), and a small LCD window. The input sources are identified as auxiliary, VCR 1, VCR 2, TV, LD (laser videodisc), DAT/Tape 1, tuner, CD, and phono.

Opening the hinged door that extends across the bottom of the panel reveals three small knobs (bass, treble, balance) and a REC OUT rotary switch that enables the user to record audio or video programs from any source. Several narrow bar switches, labeled SET MENU, INPUT TRIM, EFFECT, and PROGRAM, provide a wide range of control over the DSP-A 1000’s digital signal-processing parameters. Their settings, and those of other operating controls, are shown in the front-panel display window or on the screen of a video monitor connected to the amplifier’s video output. Also behind the hinged door are a headphone jack, a bass extension button, and auxiliary composite-video, audio, and S-video inputs for connection of a camcorder or other temporary program source.

The seven power amplifiers in the DSP-A 1000 include the main (left and right) front channels, rated at 80 watts each into 8 ohms from 20 to 20,000 Hz with no more than 0.015 percent total harmonic distortion plus noise (THD + N), a center front channel with a similar rating, a pair of front channels rated at 25 watts from 20 to 20,000 Hz into 8 ohms at 0.05 percent THD + N, and a similar pair of rear effect channels. The amplifiers are also rated to drive 6-ohm loads, with power limit^ of 100 and 30 watts per channel for the main and center and the effects channels, respectively.

The rear apron has phono jacks for the inputs (and outputs, where applicable) of all sources, plus the video-monitor output. All video circuits are also provided with S-video jacks. Insulated binding posts for all speaker outputs accept dual banana plugs or stripped wire leads. The center-channel speaker outputs can be switched to drive either a single speaker or a pair. Preamplifier outputs for the main and center channels can be separated from their respective power amplifiers by removing jumper plugs. There is a line-level mono (full-range) output and an adjustable line-level subwoofer output (below 200 Hz) as well as front and rear efifects-channel line outputs for driving external amplifiers. The DSP-A 1000 comes with a Yamaha RCX remote control that can operate virtually all of its many functions. In fact, the RCX controller should be used from the listening position to adjust the DSP and other parameters for the desired effect, with the display of menus and control options on the TV screen as a guide (the same information is also shown in the DSP-A 1000’s front-panel window, but it is readable only at fairly short distances). Both the volume and input-selector controls are motor driven when operated remotely, with red LED index marks to show their settings at a distance.

Excellent working condition.
Remote control included.
Original Printed Users Manual.