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Volfenhag zx-8400 amp and ZX-4712DVX subs

Hey everyone,

I'm really stumped here. I was under the influence that the zx-4712dvx subs would work best with a Volfenhag amp. So I went ahead and got a pair of subs and the zx-8400. Please bear in mind that I don't have much experience with car audio systems. I went by what I researched and hoped for the best. Here's the config: H2 Hummer, Stock Bose 6 cd changer which I didn't want to replace, no auxilary outs so they spliced off of the speakers and decent sized "enclosed" box with several round vent holes.

After the installation, 3 techs spents close to an hour each trying to tune the system but without any luck to get a decent sound of the system. The sound comes out extremely muffled and besides that, the bass is controlled from the remote knob (not the radio where you would turn the volume up and the bass would turn up as well!!!!!). Now that seems extremely odd to me, but they insisted that this was the only way for this type of a system to work - a german thing they proposed - which is complete B.S. if you ask me.

Now could someone PLEASE help me out here. I'm starting to assume that they have no clue as to what they're doing although they were highly recommended!

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  • Sam S.
    Sam S. Jun 15, 2008

    Come on people.. someone suggest something!

  • Sam S.
    Sam S. Jun 17, 2008

    I'll go back to those retarded installers and see what they come up with. Thanks a bunch for your suggestions.. I'll keep you posted.

  • Tygh Duval
    Tygh Duval May 11, 2010

    I'll do what I can to help! First, a few more details:


    1. Do you know the internal volume of the enclosed box they are installed in?

    2. The Bose 6 CD changer is the in-dash head unit, yes?

    3. How many speaker outputs does the Bose unit have?

    4. When you say they "spliced off the speakers" from the Bose, did they connect the speaker output from the Bose to the high-level input of the amp? If so, do you know what speaker outputs were used to connect to the amp?

    5. Do you know if the dual voice coils of the subs were wired in parallel (I hope so!)?
    Really, there are two issues. Why you can't control the volume of the subs via the head unit volume control and then why they aren't hitting like you were hoping. They may be related. Keep in mind that many times, depending on the vehicle, the box, and the type of music, a sealed box may work better than a ported or bandpass box.


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U JUST NEED 2 REAJUST UR AMP

Posted on Mar 20, 2009

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Well, you should tell them they have no idea what they are doing, you should have them re do it with a seperate amp that is DESIGNED for a bass and then it will work fine :)

Posted on Jun 18, 2008

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First of what you have should work great together....now the next thing is: does the bose system carry powered speakers if so the spliced speaker wires should be put onto a converter(a small box with RCA outputs) then you should make sure the levels in the little box is not set to full but 75%, if set to full you can be looking at distortion. Then they should set the amps to full range and see what you get.........oh and by the way you don't have to use that little controller(with the telephone wire) for the bass. You can control the bass with the frequency controllers on the amp or your head unit. And it's not a german thing trust me they come with nearly all amps now. These guys are full of ****. If you don't get the punch you want they should try bridging the amp for more of a punchy sound. Oh and you can use that decent sized box with the vent holes......that should work fine.

Posted on Jun 17, 2008

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