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You can't run either amp directly from a 100K volume control. The input impedance on the CDA amp is way too low to do this without significant loss and the SDS amp ends up sounding really thick and with almost no highs.
I just finished a stock CDA-245S kit and all i can say is I am most disappointed. It is totally lifeless. no freq extension either way. This is supposed to be 250watts and my 50watt glass amp beats it in every way. whats going on?
Also, in my opinion, the CDA-254 is not a good candidate for driving with a tube preamp. I have tried a few options and it is just not practical as it loads the last tube stage too much. The SDS, on the other hand, is perfect for driving with a tube preamp. Also, the CDA-254 is dead quiet, whereas the SDS-254 is most certainly not due to the added gain stage. Once I try the buffered volume on the SDS, I'll post findings.
My tube preamp has 200ohm output impedance I tried the amp with a SS preamp and it was no different and the same with feeding my dac directly into the D amp. The DAC has extremly low output impedance. the Xformer measures 33.6 VAC and the PS measures 44.6VDC
Rebuilt Maggy IIIa's custom passive xover with 12ga coils and Solen /clarity caps.Right now I am running bass panels with 150watt SS (db Systems) monoblocks and the mid/ribbons with a TAD-60 glass amp. All is nicely balanced, confirmed with TrueRTA and a Behringer mic. Bass is supplemented with a pair of Janis W-1's running 40hz on downThe goal is to go four way active and using all new d amps. I was hoping that these class D audio kits would work. The bass panels are 5 ohms, mids are 2.5 ohms and the ribbons are 2 ohms native.for the active xover I was thinking the mini DSP
Rebuilt Maggy IIIa's custom passive xover with 12ga coils and Solen /clarity caps.Right now I am running bass panels with 150watt SS (db Systems) monoblocks and the mid/ribbons with a TAD-60 glass amp. All is nicely balanced, confirmed with TrueRTA and a Behringer mic. Bass is supplemented with a pair of Janis W-1's running 40hz on down. The goal is to go four way active and using all new d amps. I was hoping that these class D audio kits would work. The bass panels are 5 ohms, mids are 2.5 ohms and the ribbons are 2 ohms native.for the active xover I was thinking the mini DSP
Hope you get it figured out. Fwiw, my cda-254 runs a 12" 3 way, 4 ohm/90db with no problems. Lots of power, clarity and very clean strong bass. You should be able to get similar results imo.