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      02-12-2017, 07:08 PM   #1
DJWabbles
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Underseat subs not working...

I have an E90 and have Focal speaker and underseat subs. Noticed last couple days that I wasn't feeling the bass as I should from the under seat subs.

So checked my amp and it's on, checked the gains and that looks fine. I have a remote for the sub and that works as you can hear the bass slightly but isn't full blown sub feeling of it.

I mean when you turn it up you can feel the bass. I've tried CD, aux and Bluetooth and still the same issue.

Not too sure what the issue could be. I checked the cables and they are in securely and tightly.

Any ideas. Also is a JL XD 400/4 v2
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      02-12-2017, 07:45 PM   #2
taibanl
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From where are you getting your signal?
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      02-12-2017, 08:33 PM   #3
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From the from speakers.

The mid range spekards as well as the tweeters are working fine. Don't understand what the issue is. Both driver side and passenger are not working.
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      02-12-2017, 09:05 PM   #4
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Probably a loose connection for the signal going to the amp. Are you using high level or line level inputs? If you're using a line level input, check the LOC and make sure it's working correctly. Especially for the Top HiFi (Logic 7) system, if you get a cheap LOC that cannot handle the power for the sub channels, it will clip/eventually fail.
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      02-12-2017, 09:43 PM   #5
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Quote:
Originally Posted by DJWabbles View Post
From the from speakers.

The mid range spekards as well as the tweeters are working fine. Don't understand what the issue is. Both driver side and passenger are not working.
WHICH speakers
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      02-13-2017, 05:35 AM   #6
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I have Focal installed in both tweeters, midranges and the subs of course, noticed that when checking the fade the rear speakers sound very low as if they are muddy and same with the subs as well.

I will need to check the settings on the amp.
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      02-13-2017, 06:58 AM   #7
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Quote:
Originally Posted by taibanl View Post
WHICH speakers
The signal for the amplifier is taken directly from the outputs of the
stereo in the front.
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      02-13-2017, 01:30 PM   #8
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https://goo.gl/photos/nz6DfngoLLusZPyG6

This is my current set up. I changed channel 3/4folter mode to low pass as that's the subs. But it sounds better but feels like it's lacking still. There is no oomph.
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Current Car BMW E90, nothing special apart from the speakers I have in my car. Focal Elite K2 power 100 Speakers and IFBMW Sub In My BMW E90
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https://www.youtube.com/watch?v=_PCBNHHOUMU
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      02-13-2017, 03:23 PM   #9
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Which system did you start out with ?
If you started out with the base system did you split the parallel
connection between the door and floor speakers.
How did you allocate the channels?
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      02-14-2017, 05:39 PM   #10
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Quote:
Originally Posted by DJWabbles View Post
Quote:
Originally Posted by taibanl View Post
WHICH speakers
The signal for the amplifier is taken directly from the outputs of the
stereo in the front.
Just checking.

My theory is busted.
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      02-15-2017, 07:31 PM   #11
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All working now. Had to fiddle with the input voltage, as well as the filter mode for my speakers and subs.

The front and door speakers are on channel 1/2 and the subs are channel 3/4 and the rear are running from the stereo amp.

Mine is professional radio but is base. No tweeters and no amp.

For some reason when there are some songs where I can hear the mid range rattle but only in the passenger side. Seems to be something lose. The driver side seems fine. But when I sit on the passenger side don't hear it. When I go back to driver side I hear it again. Is it just me or is something wrong.

Noticed the gains was way too high for channel 1/2 hence door mid range were taking too much bass so reduced that. But when playing at slightly higher volume hear the distortion even on CD, aux and blietooth and even radio.

Not too sure what it could. Like to know before I get a audio garage to have a look.
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https://www.youtube.com/watch?v=_PCBNHHOUMU
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      02-15-2017, 09:36 PM   #12
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You're confusing the amp settings.

Gain is the level/volume, the volume isn't your issue from how you explained it. Rather it's that you are getting low frequencies to your door speakers. You need to raise the high pass crossover frequency for channel 1/2 to get rid of the bass in your doors.
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      02-15-2017, 09:46 PM   #13
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What is doing your signal processing?

It's been a while, so someone correct me if I'm wrong, but I think a good xover point is around 180 Hz for our setup.

Channel 1/2 to doors - HP, 180 Hz
Channel 3/4 to underseats - LP, 180 Hz

Start the gains at lowest, run your HU to 2/3 or so, then slowly raise the 1/2 gain until you hear distortion or it's as loud as you like on the highs then back off. The underseats should take the power, so raise the gain until you like how the highs and lows sound together.

Edit: reviewing the manual from my MB Quart set, they recommend HP@150, LP@130
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      02-19-2017, 12:12 PM   #14
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Thanks guys for all the help. Changed the frequencies for both HP and also the high pass as well and increased the low pass slightly. No distortion at all now.
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https://www.youtube.com/watch?v=dw2lEg6m_Cc
https://www.youtube.com/watch?v=_PCBNHHOUMU
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