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Multi-Way Conventional loudspeakers with crossovers

KEF Q500 Crossover upgrade
KEF Q500 Crossover upgrade
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Old 30th December 2015, 10:10 AM   #11
giralfino is offline giralfino  Italy
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IMHO there is nothing to upgrade.
The resistors and coils don't degrade, so no need to replace.
The film caps don't degrade, so again no need to replace.
The only thing that degrades over time is an electrolytic cap, and this need to be replaced after some years (10?), because the value has changed. I don't think you need to replace it now, but if you want change it, do only with a similar one (bipolar electrolytic), because of the ESR, whose value Kef surely counted in the crossover implementation.


3x 330uF + 1x 10uF are technically equal to a single 1000uF cap. However leaving out the 1x10uF cap makes a difference of 1%, negligible considering the fact that it is hard to buy caps with less than 5% tolerance. The single 1000uF cap is at least anywhere in the 950-1050 uF range.
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Old 30th December 2015, 10:14 AM   #12
eriksquires is offline eriksquires  United States
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Ralf is in another camp. Here's what I would say. Do the resistor and tweeter cap mods. If you can't hear any positive difference, stop. :-)


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Old 31st December 2015, 03:55 PM   #13
rdsu is offline rdsu  Portugal
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Thanks for your help.
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Old 4th March 2017, 08:28 AM   #14
ceol is offline ceol
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Default 2.5 Way?

Apologies for the thread resurrection, but I'm curious, given that Kef state this is a first order 2.5 way crossover at 2.5KHz, what is the 1000uF capacitor doing? Where is it in the circuit? Anyone actually know? Opinions are useful of course. I remember that Kef used to place an all pass capacitor in certain crossovers, (could have been in the smaller designs, I don't remember, it's from the 70s or 80s) to enhance the bass (as counter intuitive as that sounds!) It's just that 1000uF seems too much for anything else here.
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Old 12th October 2017, 03:39 PM   #15
Hifisound is offline Hifisound  India
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The woofer should be rolling off much lower (the Q900 woofer rolls off above 120Hz - KEF Q900 loudspeaker Measurements | Stereophile.com)
Does anyone know the same for Q500, Q700 ?
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