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Crossover Setting On Subwoofer

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Old 01-05-2009, 11:30 PM   #1  
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Default Crossover Setting On Subwoofer

I have 2 "Q series KEF IQ9" speakers and recently have added the Model "PSW 3500 Subwoofer".

My receiver is a JVC RX-5000VBK which has a subwoofer output. When connected it sends bass frequencies to the subwoofer without affecting frequencies to the 2 main speakers-. There is no crossover setting on the receiver and according to JVC all frequencies are being sent to the IQ 9's.

I'd like to know how to set the crossover frequency on the subwoofer.

Since the IQ9"s go down to 38 Hz and the Sub's crossover frequency starts at 40 Hz should I just not set the crossover at all (?) or would setting it at the first or second LED light-I believe 50hz-- or-- 60hz allow for a smoother transition?

(My other settings on the sub are "music" " slope 24b" " low pass" )

I've written KEF but they are not responding!

Thank you,

Irwin Rubin
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Old 01-06-2009, 02:36 AM   #2  
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A sub, used as an ".1" speaker, is independent of the 5 other channels. So, used as the LFE (".1") channel, the crossover frequency is not very critical, since it is not sharing the same content as the rest of the system.

"low pass" probably turns on and off the low-pass filter, which then allows you to set the frequency of which it begins to cut out the higher frequencies. Definitely need to have this switched on when listening to non-5.1 music. I would then switch it to 40Hz, because as you said, that is where the mains are done.

I would always keep it on, anyway, just to spare the speaker from frequencies beyond its capabilities.

"24dB" probably indicates the slope of the crossover (steeper or smoother). Try switching it to see which is better for your room and setup.

"Music" must set some internal parameters for the possible use in a music-only (i.e. non-5.1) setup. This is where the sub interacts with the main speakers, and setting the crossover and slope is important.


Greg

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Old 01-08-2009, 08:55 PM   #3  
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I'd recommend setting the sub anywhere between 70Hz and 90Hz. It really depends on the room and your preference.

THX certification is 80Hz, I believe. Not that it should matter much though.
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Old 01-09-2009, 02:27 PM   #4  
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Quote:
Originally Posted by Codes20 View Post
I'd recommend setting the sub anywhere between 70Hz and 90Hz. It really depends on the room and your preference.

THX certification is 80Hz, I believe. Not that it should matter much though.
That's true. And the more work the sub does the less work your main amps have to do if you set it higher.
Much higher than 80 to 90Hz can detract from the fine sound of your KEFs.
This is a limitation of some cheaper receivers or using the bass management in some DVD players (including some good ones) which cut off at 100Hz.
This has to do with the quality of your sub too. For quality speaks like the Kefs, you would want a quality sub that sounds musical.
Experiment with different xover settings, you may be quite surprised at the difference it can make.
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