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In Reply to: Re: Xover frequency for biamped Quad ESL 57s? posted by CarlyBoy on November 16, 2006 at 19:41:29:
I don't think that rolling off the low frequencies below 70-85 Hz by
introducing a passive crossover in the form of a capacitor is a good idea. It only introduces some phase shift which you dont't need.
Just run your ESL57 full range and roll off the high frequencies from
your subwoofer above 50-60 Hz. I know from personal experience that this is by far the best solution.
Follow Ups:
IMO, the phase shift introduced by the two caps I recommend is the much lesser of two evils. The Quad's penchant for buzzing bass panels is a well known fact among Quad owners & is rather simply mitigated with the insertion of a couple of small value caps at the main amplifier's input. I have conducted several a-b tests and, without exception, the bass panel roll off produces cleaner midbass & the bass panels don't sound like a small but angry bee hive on heavy bass notes!Sandro
'a small but angry bee hive'Great description! I agree with your observations. The series input cap is the way to go on the Quad amp. What ever negative there might be to this approach is swamped by the positive benefits. The speaker plays cleaner in the bass region and plays a bit louder. For the head bangers in the crowd(me) every little bit helps.
Of course we can all understand a more purist approach too. At volume levels below which the bass panels don't buzz (pretty low, IMO) that scheme has value. But there's one other issue: when a sub is employed without an accompanying hi-pass filter there is measured excess energy where the speakers overlap. In my main listening room that hump gives a pleasant midbass fullness (cellos, piano, guitar, etc.) but it isn't accurate.Sandro
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