Pop Sound in my speakers when driven loud from studio recorded CD sources.


Hales Revelation 1 bookshelf speakers are what we're talking about.  Purchased in the mid 90's and had been in storage for about 15 years in climate controlled conditions.  Just started using them again.  I'm finding under most conditions they perform admirably all around.  When listening to certain studio recordings on CD where the sound is very dense or the recording has a compressed quality,  I am hearing a distinct "pop" (not part of the musical presentation) when, for instance, the drummer makes a strong slap on the snare drum or tom tom.  Low frequency bass response is still very agile and stable for these small speakers.  Is it possible my mid bass driver is stuttering under these circumstances?  These Hales are known to be power hungry speakers.  My amplifier is 85W per channel and I'm noticing this pop when I get the volume knob to about '12 o'clock' .  That's when it starts to sound loud in my listening room.  Other lesser sources like radio or streaming sources, don't seem to bring this on.  It's the up front, dense sound from a CD that does it.  

Any diagnostician out there that can tell what the disfunction is? ... what I can do about it, if anything?  Thanks!

chametzoo
Thanks all!  

Simao: Cambridge Audio CXC Dedicated Transport.  It says "Output Impedance" <75 ohms.
Hmmm. Then that shouldn't be the problem.
Your drivers are clipping because they're getting too powerful a signal from the DAC in your cd player when they play certain frequencies or ranges.

Do you have any other amplification sources you can try for a test?
The Cambridge CXC CD Transport does not have the DAC in it... it's just a transport.  I'm running all digital signals through the Cambridge DAC Magic Plus.  It's a digital converter and preamplifier (I'm not using the preamplifier part). Output impedance of the DAC component is <50 Ohms

I have another Marantz... the 2245. Also fully restored and putting out about 58 wpc. Probably not a good for testing with the 8 ohm Hales.

My bad for not reading your earlier post more clearly re: the Cambridge transport.