Spectral Power Amp/Preamp confrontation

[yeoldestereo]

I have seen somewhere that the early Spectral Power Amps such as the DMA 50, DMA 80 and DMA 100 must be used with a Spectral preamp such as a DMC 6 or 10 or 12. That to use any other preamp will cause severe problems. Anyone have further information as to why? I wanted to use a Threshold FET 9 preamp with a Spectral DMA 50 power amp. Is there some electronic miss match in doing this? This one got me stumped. Many thanks in advance for any help.

[paimon]

You can use any preamp you want in front of spectral amps. the rumor you are hearing about is about the speaker cables and spectral amps. Spectral amps i.e. the DMA 90, 100, 360, etc... are what spectral calls wide band width amps DC- to 5Mghz or DC to something in the MHz range. The speaker cables required are MIT Spectral Ultra Linear 750's or 770's or MIT Oracle. The MIT cables filter the DC/Mghz oscillations and dissipate them as heat outside of the Amplifier. You can use any interconnect you want or preamp or what ever before the amp. There is a lot of babble about whether or not the MIT cables are really required. Spectral voids the warranty of the amps if they detect that the required cables were not used. The older Spectral Amps i.e. DMA 50, DMA 80 don't have the same requirement stated by Spectral. The amps do have the same design philosophy and get the same benefits from the MIT speaker cables. I have a set of DMA 80 M (180 watt mono blocks) the amps run significantly cooler when MIT speaker cables are used. To me the amps and the cables inseparable, and should just come packaged together. The other rumor is about the DMC 10 preamp. The DMC 10 has 2 types of main outputs labeled DC coupled and AC coupled. The idea was to select the output to match the coupling of the power amp being used. I have a DMC 10 and I have a/b 'd the outputs with spectral amps, manley amps, parasound etc... and I can not hear a difference, nor have I had any issues with either output.