Hoist

aight, I hope you guys can help me out. I have an old waffle style Fosgate 800a2 amp pushing a Fosgate 12" HX2 DVC. The thing is, whenever I bridge the amp mono to the DVC, the amp gets really hot and sometimes shuts off. I did the wiring right and I looked it over like 10 times and I dont know what the problem is. Any ideas? Right now I have to run the subwoofer off of two channel parallel wiring to keep it from overheating. Can running a DVC stereo damage the sub? Please help! thanx alot guys

WYSIWYG

what is the ohm rating on the voicecoils? you could be wiring a load that the amp is not able to handle which is why it gets hot and goes into thermal protection!

Hoist

It is a 4 ohm DVC sub. . .wired into a 4ohm mono load. . .does this mean the amp has to be 1 ohm stable? Why is it overheating?

WYSIWYG

if i am not mistaken, the dvcs wired in parallel will appear as a 2 ohm load on the amp while wired in series will appear as an 8 ohm load. is this correct?

what are the ratings on that amp?

Hoist

I dont think the amp is 8* stable. . .that is probably why it is overheating. It only appears to be 2* and 4* stable. . .well I guess my real question then is, can wiring a DVC in stereo damage the subwoofer (Because of different channels playing different frequencies in a single speaker at once)? thanx for all your help

Hoist

those stars were supposed to be ohm signs, guess they didnt show up

WYSIWYG

i don't think 8 ohms is a problem...the amp won't even sweat it! but this is bothering me...are the voicecoils wire together (either in series or parallel) and then wired to the amp (either stereo or bridged), or is each voicecoil wired into separate channels??? i don't want to assume anything.

Hoist

Here is what I am trying to do:


See the thing is, I wire it in exactly as it shows, but I dont know whats going on. I think the amp receives the load as 4 ohms mono instead of 2. What do I do? Just wire the voice coils as seperate speakers?

WYSIWYG

if that is what you did, then a 2 ohm load is present at the amp.

according to the rf site...the 800a2 specs
- 200wx2 @ 4 ohms
- 400wx2 @ 2 ohms
- 800wx1 @ 4 ohms bridged

hopefully you didn't bridge the amp with a 2 ohm load! this is not suppose to happen, and is probably why the amp is overloaded. if you present a 2 ohm load to the amp, you are suppose to wire the sub to one of the two channels (not both)...one remains unused. you can only bridged the channels if the sub wired up to a 4 ohm load.

do you see what i am saying???


[This message has been edited by WYSIWYG (edited March 31, 2001).]

AwSoMNaMjA

umm how many subs your got? cause just that one sub will not work to the amp's full potental with a 2 ohms mono load, which will make your waffles, or a 8 ohms mono load. i would just sugest getting another sub and wire them both to a 4 ohms mono load, or 2 ohms stero mode. this way it would hit harder and get louder, and wont melt a hole in your trunk.

Hoist

oh man this sucks. Well know what I am just going to wire the sub stereo, IE a parallel configuration -- one channel gets one coil and the other channel gets the other coil. Thats about the only way I can see to wire it up without complications. Do you think wiring the sub stereo will do any harm to the sub? Thanx to everyone, esp. WYSIWYG for working with me, I really appreciate it.

WYSIWYG

get a second sub...wire as depicted and then connect both together in series and you will get the 4 ohm load needed to bridge the amp...that's 400w each.

as for wiring each channel to each voicecoil, i am not sure if you can do that. read the instructions that came with the sub.

and sorry!

WYSIWYG

one last effort...if rf makes a sub with dual 2 ohm voicecoils, you can try to return this one. that sub wired in series will produce the 4 ohms (with one sub only) needed to get max amp power.