Using the same brand should negate any issues with output/input sensitivity and impedance matching. Why would the Class D have limited bass?
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'd' amps may be said to have problems with hi frequencies, especially with low impedance loads...at those frequencies. The output zobel is the cause.
Look up the info on the top B&O ASP 1000 module as used by Bel Canto and many others.
It's pretty much all done at 30khz, into 4 ohms.
LF problems? Tell that to literally dozens of Sub Makers!
To UNSOUND: I am not sure why the TAS reviewer made that claim: (see TAS issue 203--July August 2010); I am not as techically hip to challenge the claim and also may have misinterpreted his statement..... However, there is an internet audio dealer who offers 2 separate levels of upgrade to the Quad 909 amp which is said to improve the bass; but the upgraded versions are not inexpensive---there is approx a $300 upcharge to go to level 2; I think Quad would probably invalidate the warranty of "new" pieces that were modified. For the record, I have a pair of Acoustic Zen Adagios. Thanks Jim
I always try to keep within the same brand of preamps and amps to take away the guess work. I don't know how to interpret specs of amps and preamps to see if they will work well together. And even then it may be more of a crapshoot if an un-matched amp and preamp will have good synergy.
In my main system now I have a Kavent S-33 preamp and a Kavent P-3300 amp and they really were meant to be together. Everything sounds good to me. I also found that the P-3300 I found has a 35db gain and the S-33 preamp has a provision on the remote to reduce the gain by -10 dBs. If you had another preamp there won't be a way around it if the gain was an issue for you.