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Bavarian Soundwerks' Mobile Electronics Forum
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Old 06-07-2009, 03:19 PM   #1
BudSMoke
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Join Date: Jun 2009
Location: usa
Posts: 11
My Ride: 330i e46 2002
E46 Harmon Kardon Amp Low Frequency Cuttoff

I have a dilemma. I am pushing 2 Memphis Audio 12's with a Memphis amplifier.

My HK 10 speakers are running off the HK Amp in the trunk of course.

The RCA bass inputs to my Memphis amp are being tapped off my 16x9 speakers using a convertor. These 16x9's are also powered off the HK amp.

Am I losing some lower frequency bass due to cuttoff from the HK amp or even the line convertor?

If so, is my best option to run new RCA's directly from the head unit?

I would like to enable the high pass filter on my head unit to limit bass distortion to my door speakers, but the way I am set up now it kills my bass to my 12's.

If I do run new RCA's won't I get alot of alternator whine? And if so how should I prevent it?

Thanks for the input guys. This is a great Forum.
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Old 06-07-2009, 03:34 PM   #2
BmwAudio32
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Join Date: Dec 2007
Location: Columbia, SC
Posts: 657
My Ride: 2004 Imola 330i ZHP
Quote:
Originally Posted by BudSMoke View Post
I have a dilemma. I am pushing 2 Memphis Audio 12's with a Memphis amplifier.

My HK 10 speakers are running off the HK Amp in the trunk of course.

The RCA bass inputs to my Memphis amp are being tapped off my 16x9 speakers using a convertor. These 16x9's are also powered off the HK amp.

Am I losing some lower frequency bass due to cuttoff from the HK amp or even the line convertor?

If so, is my best option to run new RCA's directly from the head unit?

I would like to enable the high pass filter on my head unit to limit bass distortion to my door speakers, but the way I am set up now it kills my bass to my 12's.

If I do run new RCA's won't I get alot of alternator whine? And if so how should I prevent it?

Thanks for the input guys. This is a great Forum.
So your running an aftermarket head but still using the speaker level outputs then converting them to get your signal? Yeah, I would definitely run RCAs from the headunit, as currently you are not getting the best out of your equipment. If your only running a subwoofer off the amp, you shouldn't really have to worry about alternator whine, as even if there was any, the low pass filter on your amp as well as the sub's inability to produce high frequency sounds (such as alternator whine) will eliminate the possibility of whine coming through.
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Old 06-08-2009, 08:09 PM   #3
BudSMoke
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Join Date: Jun 2009
Location: usa
Posts: 11
My Ride: 330i e46 2002
I rewired with RCA from the HU and I am totally blown away

I was losing most of my bass below 40-50 Hz by feeding my amp off the 16x9 subs, tapped with a line convertor.

I ran the RCA's, set the HP filter to 100Hz on the head unit and BAM, crystal clear cabin speakers and chest thumping bass.

Memphis audio makes me happy.
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