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In Reply to: Re: Film Bypass on Electrolytic vs. Polypropylene Cap posted by KT88 on October 19, 2005 at 11:43:18:
OK, the cap is on the tweeter. What sonic benefit is there to upgrading to a polypropylene cap or doing such and adding a good film and foil cap bypass? The speakers in question are AR Rock Partners, really not too bad to begin with for what they are, but I think they can be a little better...
Follow Ups:
You can gain some distorsion advantage and some frequency extension perhaps by using a polypropelene cap and a polystyrene bypass. The AR partner is not a really highly resolving speaker, so it may not make any difference. I'd just put a pair of Solens on them if I had something else that I needed to order to make it worthwhile. The shipping costs on something like that would probably outweigh the product cost and I doubt that it would be much of an improvement in that speaker anyway. The greatest defect of those are the higher cabinet tuning frequencies, which are audible as a thump type sound in the midbass (there is no real low bass). You can get the best performance from them by using them in conjuction with a subwoofer that allows them to be x-over above 60-70hz so that they do not see frequencies below that. Also be sure to place them away from corners even though they look like it would be a good idea from their shape.
-Bill
I think it may be worth investing $10 in caps for the learning experience, if anything else. This would be my first xover work (couldn't get much simpler, could it?). These speakers were a little better sounding than I expected, but fact is they haven't received much listening time.The tweeter is strange, it has no body. What you see on the front panel is pretty much it. I am wondering if it is a "decoy" tweeter put their for aesthetic purposes only...
No, it's a real tweeter. A paper cone with a very small magnet. The back may be sealed to prevent sound from entering from the woofer. It would not need the cap if it had only one driver. Have fun!
-Bill
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