Sub Distortion

[wired_af]

I've got a problem here:

I have a Visonik V700HC amp that is 650W at 2 ohms, and an Audiobahn AW1000X subwoofer with the 4 ohm DVCs wired parallel to make a 2 ohm load. I got it all hooked up to the amp in my sealed box, but there is barely any bass comimg from the sub, and when I turn the bass boost and gain all the way up all I get is distortion from the sub. Both the sub and the amp were bought from the zeb, I am using 4 gauge power and ground and 12 gauge speaker wire. I have triple check all wires and switches but I cannot fix this problem, anyone know whats goin on?

Thanks!

 

[Alec]

So the amp is 650 RMS? What is the RMS rating of the sub?

And you're going RCA from HU to amp? Is the HU set to default (ie, there are no weird things enabled)?

 

[wired_af]

the sub is rated at 600W RMS, all defaults, RCAs are fine...this has got me stumped.

 

[wired_af]

all the nice people here helped me get all this equipment:
http://www.explorerforum.com/forums/showthread.php?s=&threadid=92180

 

[Alec]

Ok, I'm still a bit confused by audio stuff:

You're not sending the sub 1300W, are you?

 

[wired_af]

I am sending the sub 650W RMS, 1300W max.

 

[Alec]

And you're sure you haven't blown the sub or got a bad one? I'd both test the sub with another amp, and the amp with another sub.

 

[wired_af]

Better not be blown, just got it from the zeb. I would test it out with another sub/amp but I really don't have access to either.

 

[wired_af]

I read that is one voice coil is blown the sub will move but it will sound like crap.

Hope thats not the case.

 

[mhn3773]

if one coil is blowin( =) i blew up my first 10) the sub will put out minimal bass but will kinda of soound like a bunch of bolts are ratteling around inside the sub..its hard to explain the sound

BUT...big big but here..if u set the pos and neg on one coil..then when u wire the other coil u swith the pos and neg on the amp..so say u have the pos going to the red conector on one side..then on the other u have the negative on the red..that will also cause no bass and nothing but distortion

i think? if a coil is blown and push the sub in evenly( the bell in not tipping to one side or the other) and it makes a scratching noise the coil is dead? not sure on that one

but u might just have a wire crossed =) hope that helps

 

[Fixxer]

You will get distortion if you have your gain all the way up and the bass boost, you would be driving your amp into clipping probably. Turn off the bass boost and set the gain at 1/2 and check your settings on the HU maybe.

 

[CQ7String]

Check the phase as well.

 

[wired_af]

thanks for the help guys.

It sounds like what mhn3773 described, so I'm thinking I got a bad sub. :frustrate:

 

[wired_af]

If the RCA outputs are speaker level on the headunit, and I have them connected to the line level on the amp, would it do this?

 

[CQ7String]

Possibly. (terrible answer, I know)

Any setup that's improper can usually either work for no apparent reason, or lead to stuff like this.

 

[wired_af]

I tested both voice coils with a volt meter and they both read around 4 ohms, so I guess the suub isnt blown. Somethin is screwed up.

 

[CQ7String]

Your HU plays MP3, but doesn't have a dedicated sub out?

 

[wired_af]

Ya I know, that kinda sucks!

 

[wired_af]

Ok to clear some thing up here: the sub cone moves a lot, but the bass cannot be heard with all the distortion, even at low volume.

 

[mhn3773]

ok are u sure that u have the positives and negatives in the right spont on the amp? doenst matter what wire u have hooked where on the sub as long as its the same on the amp..so if u have black with white writing on the pos on the sub that needs to be on the pos on the amp

even out of phase it wouldnt be that bad would it? it would still play right?

ok i just thought of something try this..but ONLY run it a few secconds just run 1 voice coil to check and see.run 1 for 1 secconds then the other for 1 seccond if one sounds different then the other theres a problem..but if they both sound fine its ur wireing...just dont run on one VC..they smoke out and die trust me lol