(1) single voice coil subwoofer
(2) 400 watt amps

if you put the positive from each amp onto the positive on the sub

does the output

(-a-) double (its getting 800 watts)
(-b-) remain linear (stays at 400 watts)

 

I'm 99% sure it will not work and blow all or one of your components.

As far as I know there aren't any amps made to be connected like that but I could be wrong I'm not up to date with all the new tech out there. Also the 2 different signals would cause alot of distortion in your speaker and eventually blow it. The speaker would have to have a dual voice coil.

 

The question is WHY would you want to do that to a SVCl sub? It is possible to run two amps on a DVC sub. It is a lot simpler to run one amp then to have to deal with power issues as well as grounds and having to gain match the amps for the sub. I would just get one dual 4ohm sub for one amp and a second for the second amp. You should be able to get a cleaner sound from two subs with two amps then the two amps on one sub if you are going for clarity.

But if you're set on running both amps to the one sub, then as far as I know you can drive a SVC only with one amplifier terminal. If the amps are different, you cant parallel amps onto one speaker because the internal impedance of one amp may be lower and will spoil each other out.

You can, however, bridge two amps so they drive as though they were one amplifier. To do bridging they SHOULD be identical amplifiers AND it would be nice if one or the other had a bridge input so the phase can be inverted for bridging.

 

^ This is True,

you can only Bridge or run an AMP in parallel if there identical, if i were you and i wanted to get some bass out of some subs, and wasnt to keen about how crystal clear it was get a sub that is 4 ohms DUAL coice coil get a amp to MATCH it RMS, then dont hook it up in series hook it up in parrallel, then the amp will be playing at 1 ohm, just make sure it is a ohm stable amp, Hifonics buy far are my favorite, there cheap and they last and they dont get very hot, plus there very good for not upping the size alot.

I was pumping the 1500TXi the new one!!! 1500 Rms at 2 ohms, and it is 1 ohm stable!
should have been like 2800 wats peak in parrallel...

I have it pushin on Kicker Comp Solobaric L7 15"

Now it is in the grocery getter!!!

 

the amp was setup as a thought process mainly

a example

 

It would a. Distort, b. Decrease the working voltage, c. Increase amperage. D. Activate safetys and or blow the amp. The amp itself would determine if the wattage goes up. Also if the phase was slightly odd.

 

IF the amplifiers were identical down to the last resistor on the circuit boards, and the signal fed to them were identical, and the gains were identical, or there were some sort of current sharing or feedback feature, so they wouldn't fry each other when so connected (that is, assuming the setup will function):

The speaker will still only take what it takes. If you have it at a sane listening level, this likely means well under 10 watts.

IF the voltage output from the pair of amplifiers is the same as the voltage output from a single amplifier, the power output will be the same, and the speaker will have the same volume of sound output. If one amplifier were unable to supply the required power output, then you would be able to get more power with two in parallel.