Spectral Audio DMA-50 Megahertz Stereo Amplifier

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Very simple design and operation, yet built to the highest quality standards we have ever seen. I'm talking laboratory instrument quality with regards to component selection, layout, and design. 

One of the few amps worthy of interior shots and a plexiglass cover. 

Notice the gold plated circuit board and the methodical component placement and wiring paths.  

Simple operation containing only the most critical adjustments. Just power and mono/stereo operation. 

Decent condition with some signs of use on the edges as shown in our photos. Tested fully in our lab and woking to specification. MSRP $2,999.00

Click below to add our recommended matching cables from Kimber Kable, all brand new as SkyFi is an official Kimber dealer.

Kimber Kable - RCA Interconnects

Kimber Kable - Speaker Cables

Kimber Kable - Power Cords

See our other Spectral listings for matching MIT/Spectral cables for a perfect match by clicking here.

The SkyFi Testing Process for Solid State Amplifiers:
We start with a visual inspection of all internal components to make sure there are no signs of stress or aging. Capacitors are checked for telltale sings of bulging or leaking, resistors are checked for signs of overheating or cracking, and transistors are checked for signs of stress or damage.

We then power up the unit carefully and run a simple 1k sine wave while monitoring the output on an oscilloscope for signs of distortion or noise. Finally, we run the amplifier to its full rated power into the appropriate resistive load provided by our Sencore amplifier tester. If there is an issue, it will usually be noticeable at this point. If everything reads clean, we will often test for THD (Total Harmonic Distortion) measured by our Keithley distortion meter, and compare it against the original manufacturers specifications. The amplifier then remains powered on to "burn in" on our test bench for a few hours to make sure there are no heat related issues. If there are balanced inputs available they will be also be tested.

Final testing involves pushing actual music thorough the amplifier. We've learned over time that some issues are only noticeable to a trained ear while listening to familiar source material. Our test bench has reference vintage KEF speakers that we're very familiar with which quickly reveal any discrepancies. Some amplifiers will then move into our listening room where they are tested with our in-house reference speakers of choice.