While a long time audio guy, I just acquired my first Klipschs, a pair of Chorus IIs. I have been curious about high efficiency speakers and horns but did not want to spend huge $. My local dealer who has become very into the vintage audio movement played a pair of unmodified Forte II with a Sansui AU717 and it sounded great.
I had two amps available to drive the Chorus IIs, a pair of Tube Research Labs Samson monos (300 watt/ch solid state) and a pair of Viva Aurora SET monos (845/211 tubes). In my short two days of listening I have been mightily impressed
and want to see about potential mods to improve the performance.
I have been looking at the various forums on Klipsch mods and found many suggestions. I want to take a methodical approach and only do on mod at a time so I can evaluate each change. I am interested in prioritizing the list in order
of highest improvement first. What I have found in the forums in no particular order is:
1) Swap out K-79 tweeter module with Crites titanium module
2) Swap out K-61 midrange module for Klipsch titanium module
3) damp outside of mid horn with dynamat
4) damp woofer with doughnuts of F-11 Acoustical Felt (1/4 inch thick)
5) Add 2.5 ounces of mass via two large washers glued to back of 15 inch passive
6) damp spider of passive with dynamat
7)damp/reinforce spider of 15 inch woofer with dynamat or plumbers epoxy
😎 reduce cabinet vibrations with either bracing/straping or dynamat on walls of inside cabinet
9) Deploy ping pong balls/acoustical felt in mouth of mid horn and 30ppi foam in throat of horn
10) Replace crossover with Crites or ALK crossover.
11) Raise up speakers on stands.
I look forward to hearing from those who have the experience of having deployed these mods and your opinions. Thanks in advance.