# Can i bridge two bridged amplifiers?

Well, the question itself tells a lot (mostly how bad it's asked).

I have a quad amplifier that i'm using as a stereo bridge. So is there a possibility to bridge those two (or parallel em?)

This amplifier is not some factory made amp, It's a simple amp i made with TDA7375.
The output is somewhere between 2x30 and 2x40W , but i'm only using one channel and it seems like a waste (I'm using it as a small woofer driver, didn't have another amp so this one had to do)

So, The question is Is there a way i can make this Mono so i can get some more power out of it (or just use both channels so i don't only use one). The amp is TDA7375 and the speaker is Novex sps250i (yeah, it's crappy but sounds decent) Also it says nowhere that this one can be bridged to mono.

Also won't it work if i parallel two channels and then bridge them to mono? (as in parallel four into two then bridge those) From what someone told me if i want to parallel it i'll need some 0.1ohm 5W resistors (those are really cheap and easy to find here)

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steveastrouk6 years ago
Mm no. A bridged amp works because its two components are swinging symmetrically about the midpoint of the supply. What would two bridged amps swing around that could increase the output power ?
T0C (author)  steveastrouk6 years ago
Well, won't it work if i parallel the two bridges then bridge them (what i meant to say is instead of having the four outputs bridged to two, can't i parallel the four outputs to two and then bridge those two to one?). (Well, this is getting confusing)

That way won't the paralleling increase the amperage and the bridging the voltage, if so what would that do?

Actually i can understand increasing the voltage, but what exactly does the amperage do in this situation does it do something about the output impedance or something about the power???
6 years ago
No, it won't work. You can't get more power out of the system, that's determined by the loads and the supply volts, and you can't connect two bridged amps to gain anything.
T0C (author)  steveastrouk6 years ago
Ok, thanks

Guess i'll go buy a speaker with a dual voice coil or just make a better amp.
frollard6 years ago
yo dawg...
T0C (author)  frollard6 years ago
Yo dawg, i head you like amplifiers so we put an amplifier in your amplifier, so you can bridge while you bridge. :) (Trollface)
6 years ago
I had no meaningful answer for ya...if I recall correctly once its bridged you want to avoid other bridges because they'll essentially be short circuits, but its been years since I set up an amp....

so I had to hit up the obvious joke.
T0C (author)  frollard6 years ago
Well you're right , i think. I have almost 0(well not exactly 0 maybe 0.5) idea what i'm doing with my amps when it comes to bridging, i still have a lot of amplifiers to toast before i learn.
thegeeke6 years ago
I would bridge the amps separately. There isn't a problem with bridging a stereo amp, but I would never bridge two amps together. You would just be asking for trouble. I might not be quite understanding your question correctly though, if you uploaded a diagram it might help me give you a suggestion. :)