Two subs to a 1 channel amp?

ebumdude

How do you run two subs off of a 1 channel amp? Is there a diagram someone can't point me to? Or is it as simple as doubling the wire connection at the + and - terminal at the amp, then splitting them off for each sub?

treitz3

We need more information. What components do you have?

kneedragger37

We do need more info, as treitz said, but just some general rules of thumb...

Your amp needs to be capable of driving both subs, for both power (watts) and impedance (ohms) requirements.

For power, you simply add the wattage of your subs together -- so if your two subs each require 200W RMS, you'll need your amp to put out 400W RMS.

When wired in parallel, your impedance will be halved (as long as you are using identical subs -- if you are using two different subs, make sure you post the specs for both subs here). If you are wiring in series, your impedance would be added together, just like the watts. So, if your subs are 4-ohm, wiring them in parallel would yield a net impedance of 2 ohms, an impedance at which, with very few exceptions, only high end amplifiers will be stable. If you wire the same subs in series, your net impedance would be 8 ohms, which most amps can handle with ease.

Of course, without knowing the specs of your exact equipment, I couldn't say how to wire the speakers for your particular project, or if they should even be run by the same amp at all. Post the models and specs of your subs and amps and we'll go from there...

ebumdude

Sorry about that...

I have to MM2104's svc and a TMA T1000.1 made by JL. The TMA is here:

http://www.woofersetc.com/index.cfm?fuseaction=product.display&Product_ID=7024


I also found this:

http://akamaipix.crutchfield.com/ca/learningcenter/car/subwoofer_wiring/2SVC_2-ohm_mono.jpg

http://akamaipix.crutchfield.com/ca/learningcenter/car/subwoofer_wiring/2SVC_4-ohm_mono.jpg

which is going to be the better choice for these Polk's?

THANKS in advance, lol.

kneedragger37

ebumdude wrote: »

Sorry about that...

I have to MM2104's svc and a TMA T1000.1 made by JL.

OK, well I'll help you here as I was a car stereo guy before I got into home theater, but FYI this is a HT forum and you should repost this in the Car Audio forum, toward the bottom of the main forum page.


Anyway, the TMA is 1-ohm stable, so wiring the subs in parallel for a 2-ohm load will work. However, it's rated for 750W into a 2-ohm load, and the speakers only call for 400. It's really too much amp for the subs, but if you already have the amp and want to use it, it will work -- just be careful about how you set the gains so you don't over-drive the subs.

I also found this:

http://akamaipix.crutchfield.com/ca/learningcenter/car/subwoofer_wiring/2SVC_2-ohm_mono.jpg

http://akamaipix.crutchfield.com/ca/learningcenter/car/subwoofer_wiring/2SVC_4-ohm_mono.jpg

which is going to be the better choice for these Polk's?

THANKS in advance, lol.

The second diagram -- two 4-ohm subs wired in parallel to create a 2-ohm load -- is the one I would use.

ebumdude

My bad on posting in this forum...lol. I thought this section was for all subs.

Thanks for the input kneedrag, I was leaning toward the 2nd diagram as well.