I just bought two JBL BP600.1 amps, since you guys said they were pretty good for the money. Now I need to find a sub, or two...

Would the rockford RFR3112 12" sub handle both of these amps? It has a 1000w RMS and 2000w peak power handling rating. I am going to wire each amp to one of the subs voice coils. Would this be too much for the sub? If it is, should I get 2 12"s instead?

 

That sub should be fine with those amps, just make sure both coils get the same signal, so they're not trying to fight one another.

I'd probably one the 2nd amp off the pass-through on the first one.

 

I'd go with twin 12's with an amp on each one myself.

 

Well, if you want to blow a sub...

Go to Wal-Mart and buy one of those $30 subs already in the box. Take it home and hook it to that amp. Turn it full blast and see how long it will last. Be sure to video tape it so we can see too.

 

it will work, just make sure you match the gains with a DMM.

 

Exactly. Crossovers as well.

And on another note..... why didn't you just buy a single BP1200.1?

 

i coulda sworn i heard from here that hooking an amp to each voice coil is bad???? or is that a 2 channel amp and hooking a channel to each voice coil?

 

Using a test tone while adjusting the gains would make it easier while using the DMM.

There's also the old trick of wiring one VC backwards to that of the other VC (so one would be hooked to one up as + to + and - to - and the other would have the speaker + going to the amp - and the speaker - going to the amp +) and then adjust the gains until the sub doesn't move anymore. Not as accurate as a Digital Multi Meter but if you don't have a multi meter to use that can get you somewhat close.

Ted

 

woah woah woah.....slow down

I know the basic stuff, but none of the more detailed stuff. How do I det the gains????

 

What if get 2 of those subs??? Will I be underpowering the subs, or will at actually be louder? Thanks

 

http://totoro.efiregate.net/HTMLPage...ainSetting.htm

As you set the gain use a digital multi meter on the Volts (AC) to match the output signal from each amp's speaker terminals.

 

You cannot accurately set an amp's gain with a multi-meter. You need to have an O-scope. You can't tell when the signal begins to clip using a multi-meter.

Two subs will be louder than 1. Running two amps to one sub is a terrible watse of power and money.

 

That doesn't say to set the gains with the multimeter. You use the multimeter to match the output voltage so you know that the amps are putting out the same power. It's actually best to use 2 DMMs (one on each amp) then you can see the output side by side and make adjustments but not everyone has 2 multimeters. It is best to use an o-scope to set the gain but not everyone has one. I powered 1 sub with 2 amps before and I set the gains with an o-scope (as I always do) and matched them with a DMM.

 

BTW, IMO 2 subs with an amp on each will sound very similar to 1 with double the power. The gain from doubling power is a theoretical gain of 3dB, the gain for adding a second woofer is the same. In the real world you MIGHT see a gain with a second sub depending on box design but realisticly (especially with the size and shape of our hatches) I highly doubt it's worth the price of a second sub (they go for $220US on e-bay).

 

I still say he's better off with 2 subs. With that much power going to a single sub there will be a considerable amount of compression going on. It would be much more efficient to have 2 subs with an amp on each one.