No offense meant at all, but in your current configuration,
the NAD and its 60 watts per side, on paper sounds fine,
with 98db sensitive speakers.
However, experience has shown me that, that specification
is NOT a fair gauge for buying an amplifier that at the lowest
volume the Bass is tight and full.
Experience also has shown me that, generally speaking, the
more power, the better.
My PS Audio GCA-500 at 4 ohms produces 1000 watts per side.
The reality is, the 60 watt NAD Receiver will likely damage my speakers, long before the PS Audio powerhouse would.
At 1000 watts, the Klipsch can demand all the juice they
want, and then some; And the P.S. Audio amp. NEVER will come close to straining(clipping).
Meanwhile, the NAD, is working harder, by the absence of
tight bass,flowing mids,highs that are sometimes harsh, signs the Klipsch,are politely clipping.
250-300 watts I feel is minimum power, to get the smooth
yet tight sound they became famous for.
The Klipsch will sound much better with a better amplifier.
Get a Soundcraftsman of E-Bay for $250, the very Dynamic
375 watts watts per channel at 4 ohms.(1000 peak!)
The first 1-5 watts, are critical to the Klipsch.
I throw 1000 watts per side, and my Chorus II's NEVER
sounded better. Sure, a transistor radio will drive them,
but,there is NO substitute, for RAW Power! It's ALL about,
headroom.
You will think You DID! Buy new speakers, with a amp.
that has real Power.
That NAD is not doing Justice to the Klipsch, IMHO that is.
I have had NAD, and Klipsch, people see the 98db. and go
yippee!
Many Folks think I only need a 75watt Receiver/
WRONG!WRONG!WRONG! Not NAD, Kenwood, Yamaha etc...
Luxman 4000,Pioneer M-91, are 2 older amps. that ARE able,
to make the Klipsch perform better.
The better the amplifier,pre-amplifier, and C.D., all
Will improve the speakers you have.
Before You get rid of the Klipsch, at least hear them, the
way they were meant to be used.
Now You can improve Your "Source", pick up a better C.D. player,or at least try a DAC.
Even 2 Sony 55 E.S. in Mono at 300 watts,Bi-amped with one 300 watts for Highs,and the other 300 watts for the Lows; Can be had
off E-Bay, both for $200 or less!
Just Trust me, You have NOT heard Your Klipsch sound their Best.
Enjoy the Music!