Amp Cutting Out?

[SysLink67]

Hi I have a quick question in relation to my Yellow Top battery I bought about 12 months ago.

I have a optima deep cycle 41 A/H 500CCA Yelltop battery, I belive its a D51.

I'm using the battery in my 1990 nissan skyline GTR. My problem is this : I was running a mono block amp (sony XM-D1000P5) and a simple two channel amp. The stereo was fine.

Recently the 2 channel amp broke down and I replaced with a 4channel amp. After doing this my stereo now chops / cuts out after 10 ~ 15 minutes of playing at loud volume....

What I mean by chops out is that the mono block amp and sub continue to run along with my head unit but the front and rear fill running off the 4 channel amp chops out (cuts out).

So I bought a 1 farard capacitor to try and fix this problem, but it still occurs. Then I also ran a new 4 guage earth cable in the boot direct to the 1 Farah capacitor and also to the negative side of the battery to try and remedy the problem, still happens.

THE PROBLEM STILL OCCURS.... Also for infomation my mono block amp uses 10.5 ~ 16 Volts and the current drain at rated output 90A (at 2 ohms) and my new sony 4 channel amp (sony MSD46X) and the Current drain is (@ Rated Power - 4Ω): 31Amps. So my question is can the Optima yellow top battery handle my CAR amps or what else do you think the proplem can be....??

PS : Also does anyone know the output of a 1990 R32 GTR alternator?? see if may be a problem aswell?

[685]

dont think it has to do with alternator or not having a capacitor..i run 12 speakers in my car not including my 2 subs..i hav two monoblocks, one for each sub..and i just have a exedy heavy duty battery..nothing flash..

i had a similar problem to what your describing when i 1st started doing up my sound system..this could be one of two things..

1) over heating..the amp is over heating..and so going into protection..

2) amp is broken..i had an amp..dat worked..but..afta few mins of operations..turns off..

frm memory..mono blocks hav very good heatsinks..and can handle heaps for long periods of time..whereas 4 chan/2chan's cannot..

connect a mates amp or sumtin..and see if it doesnt..then its ur amp..get a new one..if it still happens..go get it chkd out at an car audio store.. unless sum1 else can provide you with some other info..

cheers

[SysLink67]

Thanks for that sugestion. The sony 4 channel amp is brand new and I already swapped it for a new one it it didn't correct the problem.... Hense this is why I'm stuck between a rock and a hard place. The amp did get hot though and that was both amps....

What causes amps to get hot? I already run a 1 farad cap to assit any voltage peaks etc...

[685]

output transitors control the amount of current frm the pwr supply and get hot..these are usually connected to the heatsink..

what a mate of mine did was, connect a couple PC fans around the amp..they cost f all..and easy to wire up..

also i suggest, double check all the wiring..i mean everything...rca's frm headunit back..power, ground, rem..everything..