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Specifically on a woofer, what are the advantages/disadvantages of recapping an aging electrolytic with an electrolytic with low esr and film capacitor in parallel versus straight replacement with a poly cap of the same total capacitance. The speaker I am considering does not have a cap of any kind on the tweeter, in fact the only device in the crossover is this single cap.
Follow Ups:
The cap does in fact belong in series with the tweeter. You must be looking at the wiring wrong or it has been miswired. The cap should be at the positive input of the tweeter.
You can use a single polypropelene cap or use that and bypass it with a .1mf if you like. Most speakers with a 1st order, 6db x-over do not have sufficient resolution to make a bypass cap effective, although some do.
-Bill
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...
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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