Combining speaker outputs on HU amp?

[UCbizerkeley 10+ year member]

Quick question - I have an Alpine 9833 head unit (oldie but goodie ). I want to use the HU's amp to power solely my real coaxial speakers, as they are just rear fill. HU is wired to battery naturally. The amp does 26rms x 4 channels. Am I able bridge those channels to send ~50 RMS to the rear speakers (2 channels)? Is it as simple as wiring the front negatives with the rear negatives, and the front positives with the rear positives? Or can I not do that at all?

Thanks in advance!

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[taintedplay 10+ year member]

yes! i was just wondering this as well

 

[KyleBechtold 5,000+ posts]

not that i know of.. most headunits are 4ohm min load.. that would put 2 ohms on each channel.. check its load min

 

[UCbizerkeley 10+ year member]

not that i know of.. most headunits are 4ohm min load.. that would put 2 ohms on each channel.. check its load min

I am no expert, but wouldn't you only lower the ohm load if you wired two sets of speakers in parallel? This is only going to one set...which might double the ohm load? I have no idea actually

 

[Rich B 5,000+ posts]

No, HU's cant be bridged.

It will wreck the (cheap, one chip) amp used in it.

 

[zack39648 10+ year member]

seen it done in other peoples rides i have worked on/ fixed for them i do alot of installs when im home for people around town .. I would say it wont work but it always worked for them i always correct it and they dont notice a difference so .. to your question will it work yes will is send double the power prolly not .. will you notice an increase NO .. will you evetually fry your amp YES ..

 

[UCbizerkeley 10+ year member]

aight thanks, guess that will not be happening...

 

[n2audio 5,000+ posts]

I wouldn't risk a nice HU like that.

Bridging isn't that easy - in an amp it involves inverting one of the two channels. One channel drives the speaker for half the wave, the other channel drives it for the other half.

With an HU what you end up doing is having one channel driving the other. The fact that it doesn't automatically result in a fried HU amp is surprising to me.

Besides - 20+w is plenty for rear fill.

I run 180x2 in front and 15x2 for rear fill.

 

[(((BOOM))) 10+ year member]

If you bridge a HU amp, you are a fvcking reeeetard af the worst sort. Give up car audio, NOW

 

[UCbizerkeley 10+ year member]

If you bridge a HU amp, you are a fvcking reeeetard af the worst sort. Give up car audio, NOW

Ok for sure, good point. I just put everything outside my house with a FREE sign on it

I wouldn't risk a nice HU like that.
Bridging isn't that easy - in an amp it involves inverting one of the two channels. One channel drives the speaker for half the wave, the other channel drives it for the other half.

With an HU what you end up doing is having one channel driving the other. The fact that it doesn't automatically result in a fried HU amp is surprising to me.

Besides - 20+w is plenty for rear fill.

I run 180x2 in front and 15x2 for rear fill.

Thanks for the kind words, I will not be bridging my head unit. Glad to hear a measly 26x2 will work for rear fill, I don't really want those speakers to be heard anyways lol (Alpine Type-S FTL).

Thanks everyone! Case closed.