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In Reply to: RE: Polk Monitor 7B (early) advice needed posted by Bold Eagle on October 26, 2010 at 18:15:26
The best mod components that I have found are Obbligato Gold Premium Caps and Mundorf Supreme Resistors.
Make sure that the poly-fill is folded so it fills the upper portion of the cabinet just to the upper half of the bass-midrange.
As long as the tweeters retain fluidity, these speakers do not require anything else. I do however get better results from extending the crossover frequency to 4K, using a 4th-order Bessel filter for the low-pass.
Follow Ups:
Thanks.
I couldn't find the crossover frequency in the specs on the Polk site. What is the factory frequency?
I did pull out the crossover/input cup and checked the filler - it's in place as you said it should be. There do not appear to be any mods to the crossovers, and they use fuses rather than the later polyswitch for tweeter protection.
Jerry
The specs I have on the 7A indicate 3K for the hi-pass, with the bass-midrange rolling off @ 60Hz to the passive radiator.
The frequency plot shows a clean, usable response from 40Hz-20Khz, with a measurable human-threshold response from 30Hz-25Khz!
It however lists a continuous handling rating of 50-watts (100 for the 10!). This may be inaccurate info, even though this series uses an older plasticized woofer design, which may account for the lack of power handling.
and from the Audio magazine equipment directory (1984) the 7c crossover point's the same as the 7a (3K) so it seems likely the 7B is the same...
Thank you.
I have an RTA, so I'll have to dig it out and see how reality compares to advertising. Just listening, the 30-40 Hz sounds pretty reasonable compared to my Advents and JBL L-110's.
Jerry
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