Say you have a quality 4 channel amp, and it's 2 ohm stable and also bridgeable.

Say you hook up the front two channels to a set of components.

So, you have the two rear channels to play with and hook up to a sub. Which would be louder, or provide more power: bridging the rear channels, and connecting them to a single voice coil 4 ohm sub, or option #2...

bridging the two rear channels, and then connecting a dual voice coil sub, running it in parallel at 2 ohms? Is the 2nd option even safe/possible?

Thanks for any info.



p.s. having two subs are not an option i'd consider.

 

It would depend on the amp and the sub.

 

Most 4-channel amps are not stable at 2-ohms (bridged). Even Alpine's MRV-F545 is not stable below 4-ohms.

If the amp is stable down to 2-ohms, chances are that it will produce more power than at 4-ohms. But that is only speculation. What is the model number / manufacturer of the amp in question?

Look it up online. There should be a rating for most wiring configurations and impediance loads. If it is a "quality" amp like to say, it should have an online manual of a reference guide of some sort.

John

 

You are correct. I have yet to find an amp that claims to have a minimum safe bridged impedance below 4 ohms.

 

Alphasonik offers quite a few... and umm well I'm an Alphasonik dealer cough...

 

dealer



John

 

Good question. I am running a Alpine 4.150 PDX and running the fronts to the components and want to bridge the 3 + 4 channels to run my subwoofer which is an Infinity Perfect 10 DVQ. It is dual voice coil, I was planning to run it in parallel down to 2 ohms. Do you guys think that would be stable?????

 

YES, the pdx is stable at 2 ohm's.

I have the 1.1000 on a 12" type x sub and the 4.150 on the fronts with the second two channels open. I was running them on the sub bridged at 2 ohms but it was just not enough power for the sub. That is the only reason that I changed.

The amps are top of the line and the tech of tomorrow.

 

It also depends on the sub. What kind of equipment do you have?

 

I plan on bridging channel 3 and 4 on the Alpine PDX 4.150, so 300 watts at 2ohm to infinity perfect 10 inch VQ, 4 ohm with dual voice coil, will run them parallel down to 2 ohms.