problem with amp??

hi, i have a power acoustik ps2-1800 amp with 2 15 inch Audio pipe woofers hooked on it...the problem is that when i raise the volume too much the amp goes into protection mode and the subs wont sound. i was told by a friend that i might be that there was too little power going into the amp, and i needed to get a 0 gauge wire to fix it. what could it be, and how can i fix it?

thanks,

Daniel

 

well...the impedance of the sub is 4 ohm, and its a single coil. the amp is bridged and its wired in parallel. i have 4 gauge wire...right now the amp is grounded to one of the seats bolts.(i sanded the paint of before grounding it.

 

well ive had this ground in my other 2 setups i had...one of them with the same subs but another amp...and this started with this new amp...(the amp is about 1 week old only).

 

okk....just wired it in series and it didnt sound...this is why i changed my old amp, when i bought this one i conected it in parallel and it sounded but like sh!t, really ugly, anyways i talked to the technician on the store and he told me i had to put a positive in the negative and vice versa in one of the subs...and guess what it sounded. So...cold it be the cables are putted wrongly?

 

okk yes this is what i did but it didnt sound

 

okk i put them up again in series but it sound like crap...no bass at all...ill take a pic of the wire setup right now

 

okk got it fixed thanks to pedro...what i did was that i putted both cables going to the amp in the positive sides of the subs and the cable going from sub to sub on the negative....worked perfectly...thanks all for your help.

 

pounds really hard...i have another question which type of box is better in terms of deep bass sealed or ported?

 

amps look hot on the floor...anyways...ive been trying to design a box on the winisd but i dont understand much of it... what is port tuning?