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Car audio problem
Posted:
Wed May 10, 2006 3:10 pmby diesel
hey all,
just put a pair of 6 inch splits and a pair of 12 inch subs into my housemates car.
splits are powered by a pissy little amp that came with them (250 watts pmp) and the subs are powered by a 2 channel 400W amp (RMS) putting putting out 4ohms. the subs are dual voice coil, also 4ohms.
ive hooked them up to one channel of the amp using the following diagram.
the problem is they will cut in and out, basically being very temperamental. any hints on what i should do? oh the amp is bridgeable.
Posted:
Wed May 10, 2006 3:15 pmby Smitty
Vin
hows the earth on the amps???
also
how big (size) is the power supply cable to the big amp?
symptoms sound like amp clipping
and thats caused by bad earths and maybe insufficent juice
hth
Posted:
Wed May 10, 2006 3:19 pmby diesel
i'm using a 4 gauge pwer lead.
the earth appears to be OK cos the splits are working no probs, but i might just find another spot for that.
can you explain clippings for me?
Posted:
Wed May 10, 2006 4:48 pmby BladeBoy
Connect them in series, the way you have them wired ATM has a resistance of 2 ohms, I am supprised the amp has not blown up!
Posted:
Wed May 10, 2006 4:56 pmby diesel
ok so why does it say 4ohm?
would this be better? cos it says 1 ohm
Posted:
Wed May 10, 2006 4:59 pmby Rossi
That's right Vince
Posted:
Wed May 10, 2006 5:15 pmby BladeBoy
Vince,
4 ohms divided X 2 voice coils is 2 ohms AC resistance not DC resistance you are reading off a multimeter, the reason the amp is cutting out is caused by the protection circuit, because the impedence is too low, hook them up in series, I.E + to (-)
Posted:
Wed May 10, 2006 5:56 pmby diesel
ok so i wired it according to the second diagram, i get constant noise but at a tiny volume. i can just feel the vibration of the subs.
Posted:
Wed May 10, 2006 6:02 pmby diesel
mark, is the second diagram in correct?
or should it be like this?
Posted:
Wed May 10, 2006 6:27 pmby BladeBoy
Posted:
Wed May 10, 2006 10:43 pmby icebreaker
Mate, feel free to bring it around and I'll take a look.
I used to compete in SPL it's been a while but I'm more than happy to take a look.
Chances are your over driving the amp or something silly. but best to check it out and see what it's doing online diagnosis is jsut a waste of time, esp when your so close by...
Posted:
Thu May 11, 2006 9:38 amby mrmina
vince my brother does car audio professionally.
i'm sure he'll be happy to have a look at it for nothing.