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Old 10-16-2006, 02:33 PM   #1
JimmyDick
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anyone explain crossover frequency for subs

i have done some searching on the forum and also googled it as well..with not much luck

soon i will be finalizing my system with the subs and my sub amps...i have 2 Fi audio 12 Qs (sealed) , i was trying to find out what frequency i need to have my crossover on my amps set at. i have been doing a TON of research on all aspects of my installation, and this topic has turned over little yields, can someone provide me with a link or hopefully some answers as to my question. and explain things as far as these frequencies go ??

thank you much
teabag
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Old 10-16-2006, 03:42 PM   #2
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every app is different...

but to start off you can have your lowpass on your subs around the 80hz mark. keep in mind, that subs in the trunk you will almost naturally get cabin gain, so even the 80hz xo might be too high. start to gradually bring it down (71, 63, 50hz and maybe even down to 40hz) if you think its too much and your mids arent blending well with your sub. i cant vouch for the Fi subs but they look like theyre more for spl, but thats another story. typcially on y our eq, you may also want to cut 40z a few db...it really all depends on how you like your music...hth
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Old 10-17-2006, 11:19 AM   #3
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anyone else.......???

bigjae??
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Old 10-17-2006, 12:07 PM   #4
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Heres a review of 12 subs, the FI-Q included. There might be some info there to help you.
http://www.soundsolutionsaudio.com/f...showtopic=7477
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Old 10-17-2006, 12:48 PM   #5
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thanks much...i am just trying to get as much info as i can...i have been looking everywhere ..and really didnt yield much info on this topic

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Old 10-18-2006, 07:54 AM   #6
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In theory, you are supposed to match the frequency that your midbases are cutoff at. If you have an all-aftermarket system, this is easy, but if you have OEM speakers, as stated before, you have to experiment.

I personally like 60 Hz max on the higher end, anything above that, and you start getting some bass-in-back syndrome (not sure if 60 Hz would work with the OEM system, as I don't believe the midbases would solidly go that low)
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Old 10-18-2006, 10:41 AM   #7
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i am running da s600 up front
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Old 10-18-2006, 11:20 AM   #8
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Originally Posted by E46Teabag View Post
i am running da s600 up front
With an aftermarket amplifier? If so, I would cross them over as low as possible (ideally 60 hz, but the limit has to be defined based on amplifier power, speaker specs, crossover slope and how they are installed), then cross the sub over at the same frequency (assuming your sub amp has the same crossover slope as the other amp.

Don't mean to be too technical, but unless you can factor in all the parameters and make an educated guess, the only other option is just to experiment as suggested previously.
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Old 10-18-2006, 01:41 PM   #9
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As mentioned before around 80hz would be a good starting point for setting the low pass crossover. This of course can be adjusted to suit your needs(based on your enclosure, the subwoofers themselves and then the amplifier). Since you have an aftermarket set of interior speakers with an aftermarket amplifier this will allow you the luxury of being able to set the high pass crossover to overlap the low pass crossover by a little bit and usually the end result will be great sound quality. The crossover point should be adjusted based on the interior speakers also, keeping in mind the speakers and amplifier and what the speakers are capable of playing.
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