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Description :
The Audio Research D130 power amplifier is undistinguished visually, inhabited by nothing more than a rocker-style power switch, two LEDs to indicate power status (standby and operate), and the company's signature rack-mount handles. It is a two-channel amplifier using advanced semiconductor topology from input to output. There are distributed power supplies on separate output stage circuit boards to yield a virtual dual-mono layout back to the A.C. power transformer. This layout minimizes signal-path lengths and allows the use of high-purity, low-ESR storage capacitors for quicker, cleaner transient response and better overall musical dynamics. Multiple-emitter transistors (METs) are used in the output stage; these devices have the electrical ruggedness of a bipolar design, and the musicality that MOSFET devices are known for. A fast-acting, sonically transparent protection circuit shuts down the driver stage of the amplifier whenever a fault condition is sensed at either the input or output of the amplifier. With ample power to drive most contemporary speaker designs, the Audio Research D130 is nonetheless compact in size, making it ideal for shelf or cabinet installation (it also has modest heat dissipation, thanks to generous heat-sinking of the output boards). Inputs include both balanced and single-ended connectors for convenient connection to a preamp or A-V processor. The Audio Research D130 provides for both balanced and unbalanced hookup, with shorting pins being provided to disable the unused inputs. Two pairs of high-quality, hex-head binding posts, a fuse holder, and a captive AC power cord occupy their respective positions on the D130's rear panel.

The Audio Research D130's tube-like demeanor results in a midrange that is liquid-smooth, transmitting a soothing tone and breathy delivery with great fidelity. The bass is assuring, presenting in a fairly tight and articulate manner. The sound of piano and percussion possesses a rich and natural sonority throughout its range. The amplifier infuses music with a compelling beauty, resulting in many long and pleasurable listening sessions. It has the natural beauty throughout the middle frequencies, the pleasing and somewhat soft, tonal balance, and its indefinable, yet abundant, overall musicality. It can paint a sonic picture full of authentic colors and textures. Metallic percussive objects, ranging from small cymbals to large gong-like instruments, are beautifully rendered with its wide range of tonal color intact. The Audio Research D130 will create a performance so close to realism that most would not forget for years.

Specifications :
Power Output.................................130 watts per channel into 8 ohms
                    ..................................200 watts per channel into 4 ohms
Power Bandwidth............................DC to 150 kHz into 8 ohms, -3dB points
Input Sensitivity...............................1.7V RMS for rated output (25.5 dB Gain)
Input Impedance.............................150kohms unbalanced, 300kohms balanced differential
Output Regulation...........................0.08dB 8 ohm load to open circuit
Overall Negative Feedback...............21dB
Damping Factor..............................100
Slew Rate.......................................50V/microsecond
Rise Time.......................................1.7 microseconds
Hum And Noise...............................Less than 55 microvolts RMS
Power Supply Energy Storage..........104,000uF
Power Consumption.........................400 watts at 130WPC 8 ohms
                             .........................640 watts at 200WPC 4 ohms
                             .........................800 watts maximum
                             .........................75 watts idle
Others............................................Input polarity: Non-inverting at unbalanced inputs.
          ............................................Balanced pin 2+ (IEC-268)
Dimensions(w x d x h).....................48.5 x 28 x 14 cm
Weight...........................................12kg

Miscellaneous :
Matching.........................................Audio Research LS3 Preamplifier
XLR Input........................................Yes
Made In...........................................USA
Condition.........................................9/10

Product Information :
http://www.arcdb.ws/D130/D130.html

Reviews :
http://www.audiophilia.com/hardware/d130.htm
http://sites.thestar.com.my/audio/story.asp?file=/1997/8/07ar
http://www.audioreview.com/cat/amplification/amplifiers/audio-research/d130/prd_116283_1583crx.aspx