Better Amp for Cornwall IV's...

You own an amp with unlimited dynamic headroom? 

The best I have ever heard any horn sound was with OTL amps.  You dont get the significant editorializing with OTLs which I think you get with SETs. Clearer, sharper, faster with fewer colorations to my ears. As others have said mentioned dont short these speakers on power.

Not a tube guy? Well you should be, you have bought the perfect speakers for tubes.

Seriously though. Buy a good tube amp. You can thank me later.....

Oz

"You own an amp with unlimited dynamic headroom?"

Maybe a slight exaggeration but all the same a great sounding powerful vintage stereo receiver.

Bill

Try a passive preamp with your Parasound amplifier. Do you have a source with a variable output ( bypassing the preamp )? Because of the very high sensitivity of the CW4s, you do not need the additional gain of a preamp, and a layer of noise and distortion will be eliminated ( IME ).

You really need to look at the measured impedance curve.I tried to find these measurements but had no luck.If the impedance does not dip below around 6 ohms then an amplifier with a highish output impedance [typically tube amps and not SS /class D amps would be the best choice].It would seem pretty silly to make such a high sensitivity speakers not to suit those types of amps but it is possible that is what Klipsch have done.If the speakers sound a bit weak or dry in the bass that is probably because the amplifier being used has too low output impedance.Which is typical of SS amplifiers including most class A ones .Adding more power will not fix this because the bass response is overdamped by using that type of amp.
If you do not want to use a tube amp then the best choice would be a Bakoon SS amp which operate electrically more like a tube/SET amp and which are current drive and have high output impedance.[Just about all SS amps are voltage drive/low output impedance]The Bakoons also sound superb and are a compelling example of why current drive /zero negative feedback/high output impedance amps sound best [if your speakers suit them and most mainstream speakers don’t].