Home Speaker Asylum

General speaker questions for audio and home theater.

RE: Polk Monitor 7B (early) advice needed

I used to call on a Polk Audio dealer years ago and I'm familiar with the 7 and 10. The "B" designation - I'm not sure what the change may have been.

As you know, since you've been involved with audio a lot of years, at one time that Peerless and a similar (cosmetically) Audax dome with those metal rectangular shaped flanges were the most commonly used dome tweeters other than a manufacturer's proprietary tweeter. Perhaps you could add Philips domes to that list, of course. Anyway, if they're using 12 mfd to the tweeter - you don't mention a parallel inductor - they probably calculated the crossover by the DCR and not nominal impedance. Personally, if these were mine and I wanted to get a bit more SPL and have more reliability with the tweeter, I'd try a series 10 mfd cap and .45 mH inductor (18 AWG OK) parallel with the tweeter. This adds only about 15 degrees of phase (I believe) and if you think you need to add some capacitance stack a small value poly cap, like a .47 mfd. I like to use a mix of electrolytics and poly caps with vintage speakers. I believe I hear the difference but I might be convincing myself that I hear it. I did a similar thing with some EPI 100's. I re-built them to sell them but ended-up keeping them.

You said that you liked the sound with your NAD, so maybe the best thing to do is to leave them alone. Like the adage, "if it ain't broke..."


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