keep blowing amp

Four 4 ohm voice coils paralleled = 1 ohm. 

it reads .01 when i touch leads to geather chris bringe

You cannot read voice coil impedance with an ohm meter.Support the12volt.com

then how you read it ?? i got a dmm

chris bringe

Now THAT is cool!2013 Kia Rio -90a alternator

DDX470HD GTO14001 GTO1014D (x3)

Big3 in 1/0G

1/0G to GTO14001

If you are drawing more amps than your alternator is putting out, chances are you are running the system below 12 volts after extened listening.  IF your battery voltage drops below 12 volts, the amp will draw more current to compensate for the low voltage.  This causes power supply components to overheat. Thus kiling the amplifier.  You have plenty big wire, and a good battery, but I bet you altenator is not keeping up. Adding another battery will only make the problem worse.  It will play longer before the voltage drops, but then the chargeing system will have to run double duty to recharge the batteries.  You should put a bigger alternator in FIRST. 

As a rule of thumb, Take the maximum watts output of your amp, divde by 13.5 volts, and that is how many amps your altenator needs to produce JUST FOR THE AMP, add to that the original size of your altenator.  Some big amps might require more than one altenator. 

ac0j has a good point that none of us have mentioned (LOL, other than OP cbringe1 in his OP about "too big a battery".) (Onya ac0j - keep it real! (That's an AC joke - not meaning to be out of sequence...).) But amps should protect their own PSUs with their own fusing, and it has been assumed it is the output that is blowing - not the PSU (input); maybe that needs confirming? Also we and most tend to use the "divide by 10" rule - ie, output Watts RMS divided by 10 = input Amps. EG - if 3000d is 3kW Music Power output, then it's 1500W RMS => 1500W/10V = 150 Amps in. That's based on amp voltage ranges down to ~12V (ie, battery discharging) combined with amp efficiency (say 80%), but it is for initial dimensioning purposed only, ie, it's an easy estimate. And it tends to underestimate. If 1500W => 150A, then its distribution (+12V & ground) would probably be 200A or higher, with fusing to suit (either the cable capability else the (lower) amp's maximum RMS current; where the fuse should be rated to carry 70% to 80% or normal or max long-term current).    Using 13.5V and the output power leads to undersizing. It omits voltage drops below 13.5V (eg, when on the battery which will probably never exceed 12.5V) and the extra current for the amp's inefficiency. Furthermore, the alternator (and distribution) has to supply the additional battery recharge current. And of course the other vehicle loads. Nevertheless, an excellent point. Is it the amp's PSU that is blowing?

What is the magic number? How many speakers can I connect to a single amplifier?

Silly boy, the answer of course is 42.

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