Im running 2 audiobahn 600 rms subs in a ported enclosure, sony 1200w amp at 2 0hmx 2, and the thing gets super hot after about 5 min... i think it might be because i have 4 gage running to it, and only 8 for the ground..and sugestions? yes i plan on getting new sh@t once pay day comes...
HI, Im having the same problem with my Jenson amp. I am running it briged mono and the amp spec is about 250RMS 720 peak. I am running it with a JBL 12" sub and a 8 gage streetwire kit. After about 45 min. the amp just shuts down and it is HOT. I guess its just because it is a cheap amp eh? What do you expect for 30$ on ebay! lol
yeah, jensons are worse than sony in my opion...i'd say invest in a new amp! I have a 1000watt peak sony powering my 15" kicker comp VR, and it pounds it hard and sounds awesome, and does not over heat, after i rewired my sub in series
the bigger the ground guage and the shorter the better
the smaller guage ground restricts the amount of flow going through it, thus regtulating how much power the amp takes in which isnt good especially if it's under-drawing the amount of amperes it needs to properly run, the amp will clip, eventually destoying your subs and possibly the amp too
Yep. Voltage rails will sag, clipping the amp and also building up a lot more heat in the amp. Picture an water pump with a hose coming to it and a hose going out. When you have equal water coming in and going out, everythings in working order and it'll likely pump for a very long time. Now pinch the inlet hose, the pump will be forced to pull very hard and will get much less water, limiting the output as well, straining the pump motor and eventually burning it up if it carries on for too long. Same with an amp, a smaller ground is a pinched hose basically. Remember that your system is only as good as it's weakest link, and the smallest wire will be the one that has the most resistance, and since the current has to go through that wire, that resistance will be added to what resistance was already in the chassis, and will be more total resistance than the power wire.
Yeah, obviously having too small a power or ground wire is not a good thing, but having two different size wires is not gonna hurt anything as long as the "smallest" of the two is big enough to do the job, or am I missing somethin here?
If you notice 4 gauge wire has only about 2 1/2 times less resistance per length than 8 gauge. So assuming you have a really good ground(and can assume the resistance in the chassis to be very small), a one foot 8 gauge ground wire with an 8 ft run of 4 gauge wire may actually result in a HIGHER resistance on the power side of things(depends on chassis resistance).
I'd say in the case of a ground wire, length is every bit as important, if not more, than the "size". For example a 1 ft length of 8 gauge wire has less resistance than a 3 ft length of 4.
I only say this because I'm utilizing an older 400 watt PPI amp with what seems to be fixed 10 gauge(or real skinny 8) power and ground wires comin out. Unless I break open that amp and solder in some bigger stuff I'm stuck with that 10 gauge "bottleneck".
fishy is right jonathan, think of power goin thru the fuse, very small, but very short, also the ground he has is equal to the positve after you average the legnths but back to the question, i think you guys are right that it is being ran at to low of an impedence causin the overheating
Absolutely, it has an effect, but you also have to consider that the positive wire is a straight run to the battery, while the ground connects to the chassis of a vehicle, in which the impedance is unknown, and likely higher than the impedance that the power wire has. So, you're better off getting a bigger ground wire and keeping it short, so that the impedance that comes through the chassis and ground is as little as possible. Touche
tell me this then i have bought amp wiring kits from meijer before the brand is scosche or somethin i consider the kits to be pretty good for the price 4 guage wiring kit is like 25 bucks how come they give u 4 guage power wire but 8 guage ground just wonderin im thinkin of eventually gettin 4 guage ground tho.
They probably expect you to use the 4 to 8 gauge distrubution block and run 8 gauge power to your amp(s) and then an 8 gauge ground(s). If the kit came with an extra 4 gauge ring terminal just cut a bit off the power cable, crimp on the terminal, and use it for ground. You can wrap it in black electrical tape so the color doesn't confuse anyone(I did :P).
I have a sony 480 watt amp powering a 12 sony sub enclosed in a bandpass box. my problem is that after about ten minutes or sometimes less the bass cuts out for about 5 seconds and then comes back. if i dont turn the stero off it continues to do this repeatedly. my volume is usually about halfway up when this happens but sometimes it does it reguardless. is it the ground or do i need a bigger amp?