okay, so i have a JBL BP600:1 and it runs 300w x1 at 4 ohms and 600w x1 at 2 ohms. it's a 4 channe amp --> + - + - <-- and i wanted to know which way to bridge it correctly to run it at 2 ohms and make sure i'm getting the right ammount of power

+ - + -
=
A B C D

the way i had it set before was that i had A running to the positive and also a small piece of wire going to C and then D going to the negative send and a smal piece of wire going to B

this is the way my buddy told me to set it up and now i'm questioning it.

please leave a response to help me out

 

It should say on the terminals which ones are to be used to bridge it.

 

The amp is a mono amp and cannot be bridged. The sole reason there is two sets of terminals on it is to simplify wiring multiple speakers to it. You should ideally have 2 svc 4 ohm subs for this application, 1 wired to each set of terminals.

 

Are you sure you have the model# right as the model # you listed is a mono sub amp, then in the same sentence you are telling us that it is a 4 channel amp....

 

Are you confusing 4 terminals with 4 channels? I wasn't paying attention to your initial post and just saw that you said 4 channel. But now looking at your terminal diagram its either a 2 channel or a mono as your model states and those terminals are wired in parallel internally. So assuming it is a mono amp it does not matter which terminals you use. Whats more important is which subs you are using so you make sure you are wiring them up properly. 2 run it at 2 ohms, assuming you have 2 4 ohm subs just wire one sub to each terminal and you will have 2 ohms. Which and how many subs do you have?

 

Oh and the way you had it set up? is basically how its already wired inside the amp.

 

If you had one subwoofer that presented a 2 ohm load, you would simply wire the + on the amp to the + on the woofer, likewise for the - ; and that would give you the 600W. And you'd only have to use one +/- terminal on the amp.

If you plan on using more than one subwoofer you still need to make sure that the voice coil configuration will allow you to wire everything to present a 2 ohm load on the amp.

Here's what'll work:
~One Single Voice Coil (SVC2) 2 ohm woofer.
~One Dual Voice Coil (DVC4) 4 ohm woofer. Wire the voice coils in parallel on the sub to create a 2 ohm load. A DVC sub will have two +/- terminals on it.
~Two SVC 4 ohm woofers wired in parallel to each other, or one to each amplifier terminal.
~Two DVC 2 ohm woofers. The voice coils on each woofer would be wired in series so that each presented a 4 ohm load, then the woofers would be wired in parallel to bring the load back down to 2 ohm. Then you'd wire this up to only one +/- terminal on the amp.

The two sets of +/- terminals are a parallel connection inside the amp. So if you had two woofers wired independently for 4 ohms each and you wired one to each amp terminal those 4 ohm loads would be paralleled in the amp, bringing the load down to 2 ohm. Again, you'd get the 600W, 300W to each woofer.

Subwoofer Wiring Diagrams.
I suggest you use that link. If you have any questions we'll help you out. Let us know the make and model of the woofers you already have, and we'll let you know how to get it done.

Get your hands on a DMM (Digital Multi Meter), this this tool you can test the resistance of your subwoofer wiring to see the final resistance before you even wire to the amplifier.

 

Oh. sorry, yea. i was tired. it's 2 channel, not 4 haha. And i'm getting my buddy's 12" type X and i'm assuming it's a 4 ohm, and obviously a DVC.

here's a link to the JBL page for this amp.

http://www.jbl.com/car/products/product_detail.aspx?prod=BP600.1&CheckProduct=Y

incase that helps a little.
i'm pretty sure what i'm going to do know. i just want a second opinion.
cause i think that's the issue i had with my last subs. they were wired wrong and were running at the wrong impedance.

 

It's not a 2 channel. It's a mono block (1 channel). Think of it this way. both positives go to the same place in the amp and the same with the negatives. I think that sub is 4 ohms so just hook the positives together and the sam with the negatives and use either of the terminals on the amp or hook up each coil to a set of terminals. either way will give you a 2 ohm load.

 

Wait though. what are the specs on the sub? you will want to make sure its at least 600 rms if you plan on running 2 ohms. I think that sub is only 300 watts RMS and if so you will fry it.