How Do I Filter Frequencies Through My Alpine Hu? - BMW Forum - BimmerWerkz.com
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#1 (permalink) Old 04-10-2005, 09:05 PM
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I have an alpine 9831 headunit and two subs. I'm trying to filter out the low frequencies to all speakers except the subs. I have the subs hooked up via rca in the "front output" rca inputs in the head unit. (Is that even right?)

I was thinking of using the i-personalize setup thing online, but it only has options for four speakers??

All of this is well beyond me and I'm just looking for any information or explanation anyone can possibly throw at me.

Thanks.

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#2 (permalink) Old 04-10-2005, 09:42 PM
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Quote:
Originally posted by bimmer_boy@Apr 10 2005, 07:05 PM
I have an alpine 9831 headunit and two subs. I'm trying to filter out the low frequencies to all speakers except the subs. I have the subs hooked up via rca in the "front output" rca inputs in the head unit. (Is that even right?)

I was thinking of using the i-personalize setup thing online, but it only has options for four speakers??

All of this is well beyond me and I'm just looking for any information or explanation anyone can possibly throw at me.

Thanks.
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There should be a set of RCAs that are labeled sub, or non-fading (I cant remember which on that model). Use those for the Sub amp. It is equipped with a High Pass (HP) fileter for all your midrange, whether you use the rcas or the 50x4 output. Set the sub (LP) to 80hz, and the HP to 125hz. Thatll be a good starting point, take a listen to that and see what you think.

Hope that helps....



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#3 (permalink) Old 04-10-2005, 11:49 PM
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I switched the amp over to the sub rca jacks like you said. (I didn't see them when I was hooking it up before because they hang off of the unit unlike the other four.)

I also tried setting the hpf/lpf, but the low pass filter option will not come up for some reason. Only the hpf comes up, and when I turn it on it also filters the subwoofers for some reason.

I'm so confused and frustrated! Blah..

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• High-flow intake w/ Green Performance Filter
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• 20% Tint all around
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#4 (permalink) Old 04-11-2005, 12:12 AM
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Then you may not be using the right RCA's.

In theory, once you've activated the HPF, it will filter all low frequencies from the amplified outputs as well as the front and rear RCA's. The sub out (RCA) should not be affected.

If your subs are changed as a result of you engaging the HPF, then obviously you are using either the front or rear RCA outputs to feed your sub amp.

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