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Thread: Having some issues with sound & new subs

  1. #1
    Maximum Bitrate orangewhip's Avatar
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    Having some issues with sound & new subs

    Hey guys,

    Having some problems here...I've been running my current system for well over a year now with no problems. My current system was as follows:

    - No head unit
    - carputer with Sound Blaster USB sound
    - Kenwood KAC-6401 amp running to stock speakers (6 in total, 4-6" and 2 tweets)

    Everything was running great, sounded good, no complaints other than I needed a little more bass.

    So...I start my next upgrade (all brand new components)...

    - 2 12" Rockford Fosgate P212S4 subs in a sealed sub box
    - 1 Kenwood KAC-8152 amp to drive the subs.

    I removed all power wiring, which was 8ohm, and replaced it with 4ohm to a distribution block and then ran 8 ohm to each of the 2 amps. My original setup is still sounding good, but the subs have pretty much no output at all and if I crank up some volume all I get is a little buzzing.

    So I double check my connections, amp is powering up, double check my ground, power up wire is working fine...all + and - to the speakers seem to be fine, running the RCA from my current amp's line outs or from SB USB makes no difference.

    So I start playing with the input sesitivity...makes the buzzing a little louder, but that's pretty much it.

    I've looked online and I've tried everything I've come across...and nothing seems to help.

    Any ideas??
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  2. #2
    FLAC shakes's Avatar
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    you mean you ran 4 and 8 GUAGE wire? Ohm is a term used for measuring resistance.

    anyway ... your problem is most likely in your sound card config ... do you have it set for 4.1 sound? 2 channel sound? also, how is your audio wired between the soundcard and amps?

    you probably aren't getting an input signal at the amp.
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  3. #3
    Maximum Bitrate orangewhip's Avatar
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    Quote Originally Posted by shakes
    you mean you ran 4 and 8 GUAGE wire? Ohm is a term used for measuring resistance.

    anyway ... your problem is most likely in your sound card config ... do you have it set for 4.1 sound? 2 channel sound? also, how is your audio wired between the soundcard and amps?

    you probably aren't getting an input signal at the amp.

    Hahaha Sorry, yeah I meant guage...long day today...

    No at the moment I have 1 output (2 channel) coming from the sound card, spliting off into 2 sets of RCAs and into my 4 channel amp. This sounds perfectly fine and have no complaints.

    Then I took a set of RCAs out of that amp and ran it into my new amp...so I think I should have signal coming out...but to check I also plugged my new amp directly into the sound card where it was going to the other amp.. and still nothing...
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    Maximum Bitrate sfay93's Avatar
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    The high pass crossover in your 4 channel amp may be cutting the signal above where the low pass crossover in your sub amp is set ergo no sound.
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  5. #5
    Maximum Bitrate orangewhip's Avatar
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    Quote Originally Posted by sfay93
    The high pass crossover in your 4 channel amp may be cutting the signal above where the low pass crossover in your sub amp is set ergo no sound.

    Yes, but I also tried plugging it directly into the sound card as well...got the same result...
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  6. #6
    Maximum Bitrate orangewhip's Avatar
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    Well, I took my vehicle into a mobile audio shop and they tested everything for about 1/2 hr...and STILL couldn't figure out why it wasn't working. They suggested my box may be too big for the subs...which I found hard to believe...so I went to the place where I got my sub box from and they said no it should be able to use the box... it might not be perfect, but it should be able to produce some sound.

    So the only other solutions would be that my brand new amp was fuxors or the subs themselves were screwed. So I got my amp at the same place as the box, so they exchanged the one amp for a new one and I went to install it.

    As I got the new amp in, I was about to plug the fuse I have in at the battery so I could test it and I dropped the fuse...and then somebody drove over it and broke it. Well, I spent the rest of the day driving around town to find a replacement fuse and nobody has the fuse I'm looking for. So I am home trying to find one online and still can't find it...I even go to the company that MAKES the fuses and the holder and THEY DON"T have it on their site.

    Damn, I am now starting to think that adding these subs wasn't worth this...this has been the hardest fricken part of the entire carputer project I've done...and it should have been the easiest!!
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  7. #7
    Variable Bitrate SickVette's Avatar
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    First...about the place that told you the box was too big and that is why you do not have sound.....don't go there again..lol. If for any reason you can not find the fuse let me know...I will send you one.

    Now lets break down your problem. Are your mids and highs playing? How are the subs wired? It is possible the impedance is too low for the amp and it is going right into protection mode. As mentioned before check all the xovers and outputs. But first do you get any output from the amp playing the mids and highs? If you do then the problem lies in the sub amp. If not the problem most likely is in the sound card.

  8. #8
    Maximum Bitrate orangewhip's Avatar
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    Quote Originally Posted by SickVette
    First...about the place that told you the box was too big and that is why you do not have sound.....don't go there again..lol. If for any reason you can not find the fuse let me know...I will send you one.

    Now lets break down your problem. Are your mids and highs playing? How are the subs wired? It is possible the impedance is too low for the amp and it is going right into protection mode. As mentioned before check all the xovers and outputs. But first do you get any output from the amp playing the mids and highs? If you do then the problem lies in the sub amp. If not the problem most likely is in the sound card.
    Well, there is sound coming out of the subs...it is just very week and very "buzzy"...so after he checked everything else out he said it could be that the subs are having problems because there is just too much air in the box...which again I don't really believe too much because the amp I got should for sure get the subs pushing in any box! haha

    I have 2 amps...one that was in my setup all along and it is working totally fine. I run RCA from that first amp into my 2nd amp and it sounds like garbage... I run RCAs from my sound card into my 2nd amp and it sounds like garbage (the same line that was in my 1st amp, I moved it to the new amp)...and the guy at the mobile shop also pluged his RCAs from his car (his test bench was at a car audio show and couldnt use it at the moment) into my amp and still sounded like garbage.

    So...it was either, box, amp or subs...and being all 3 were brand new...we were looking towards the box (remember I was getting sound, but very weak and very buzzy).

    All my connections were checked and yes the amp can handle what I had hooked up...that is why they replaced my amp...and if it isn't that, then it I guess it will have to be the subs themselves.

    The fuse is a very odd fellow... it is a 100amp blade type fuse, but it is even larger (wider) than the MAXI type blade fuses...I have emailed the manufacter and hope they will just send me one...but if you can help out, that would be great. Cause at the moment, I can't even test the new amp I just got because I don't want to have to screw around with the wiring I just finished! hahaha
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  9. #9
    Variable Bitrate SickVette's Avatar
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    Ok well at least you know have good signal so that can be crossed off. What kind of enclosure are you using? Honestly I have never ever seen an enclosure cause problems like you describe. Do you have a spare speaker you can attach to the amp and see if it is the speaker? Or do you have a multi meter to verify the speakers impedance? Where is the gain, xover, and bass boost set at? I notice this amp has the ability to take line level in......does it have a switch for line level?

  10. #10
    Maximum Bitrate orangewhip's Avatar
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    It autoswitches depending on what you have it connected to, so that shouldn't be a problem.

    The enclusure is an SUV sealed box. The subs are tuned for .86 each, or about 1.72 in total...I don't know the exact size of the box, but we figured it to be close to 2 - 2.2, it could be a little larger or smaller... I still don't think that is the problem tho...


    I do have a multimeter, but these subs are brand new in the box, so I should imagine the box should give the correct info (I also doubled checked their website). But I don't have an extra speaker around...

    The gain, xover, bass boost have all been adjusted and readjusted over and over again to see if we could get it to sound better....but nothing.

    I'm really starting to think it was a bad amp (will find out soon if I can get a hold of a fuse) or the subs are bad....both are hard to believe since this was all brand new in the packaging.

    Thanks for all your help tho, much appreciated!
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