I was just looking at some different websites and came across this page, a user review for polk monitor 40's. The user changed out a simple capacitor, and claims much better sound all around - bass, mids, treble....is this possible? I mean I'm sure it is, but it can't be that easy, can it?
He used these caps and said this in his review:
There are certainly some high-quality caps that will make a big difference in sound quality. Any speaker designer or sound engineer is well aware of this. Anyone who says different is simply ignorant of the facts.
Putting an audio signal through an electrolytic capacitor, particularly, can can distort the waveshape and introduce significant distortion.
Many high-end speaker manufacturers put hundreds of dollars for each speaker system crossover network into the kinds of high-quality capacitors that have been proven to produce the least waveform distortion.
Since those capacitors are hidden away, the manufacturers only have one reason to do this; confirmed improvement in the way the speakers sound.
One company that offers many brands and types of high-quality crossover capacitors and can advise you on the best for your needs is PartsConnexion.com (ph 866-681-9602).
Another place that high-quality caps can make a big difference in sound quality is the input coupling caps of an amplifier or preamp. I made a huge improvement in one of my power amps by replacing the stock coupling caps with Infinicaps, which Audio Research and other high-end amplifier manufacturers use on their most expensive amps and preamps.
BTW- the claim that one capacitor could change the sound of all ranges in a speaker is not really credible. Since the Polk Monitor 40 is a 2-way speaker, the capacitor in question would probably affect the sound quality of the tweeter only.