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Old 09-16-2009, 02:48 PM   #1
mysticalice

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wiring up a 4 channel head unit to 2 speakers

Hey guys,

I have a pioneer head unit, 4 channel 50W peak each, and i want to wire it to 2 speakers. don't want to use one channel per speaker and then have 2 channels not being used, so how do i bridge the channels? do i bridge them front and back? or bridge the left and right sides?
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Old 09-16-2009, 04:30 PM   #2
2pt4Turbo

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You don't, its a head unit. Buy an amplifier.
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Old 09-16-2009, 05:13 PM   #3
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Quote:
Originally Posted by mysticalice View Post
Hey guys,

I have a pioneer head unit, 4 channel 50W peak each, and i want to wire it to 2 speakers. don't want to use one channel per speaker and then have 2 channels not being used, so how do i bridge the channels? do i bridge them front and back? or bridge the left and right sides?
That's a good way to smoke the head unit's internals- don't do it. Either use two channels out of four, or buy a basic inexpensive amplifier for much better results.
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Old 09-16-2009, 08:33 PM   #4
mysticalice

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this is going in an ice chest radio, and it only has 2 speakers. running an amplifier i'm worried about because i have limited run-time (the whole thing's running off batteries).

seems like a shame to only use 2 channels. wonder if i can fit another 2 speakers into it. hmmm
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Old 09-16-2009, 08:59 PM   #5
2pt4Turbo

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If its not using two channels then the internal amp won't be using as much power...
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Old 09-16-2009, 09:30 PM   #6
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yes, but the side-effect is the speakers won't be getting as much power either, thus the head unit will have to be turned up louder to compensate.
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Old 09-17-2009, 12:28 AM   #7
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You actually can bridge the rear channels on some Pioneer HUs. If you have one of those you could add a small very efficient subwoofer. What model number is it?
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Old 09-17-2009, 02:49 AM   #8
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this is the head unit:
http://www.amazon.com/gp/product/B00..._ya_oh_product

these are the speakers it's going to be powering:
http://www.amazon.com/gp/product/B00..._ya_oh_product
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Old 09-17-2009, 11:16 AM   #9
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It doesn't look like that model is bridgeable. Looks like you're SOL.
FYI doubling the number of speakers will gain you significantly more output than doubling the power.
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Old 09-17-2009, 01:17 PM   #10
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but i don't have room for doubling the speakers i don't think

maybe i can find some 4" speakers somewhere
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Old 09-17-2009, 09:46 PM   #11
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Could he do a little surgery on the speakers and bi amp them? Two channels to two tweeters and two channels to two mids? Would that help output increase?
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Old 09-18-2009, 01:19 PM   #12
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Quote:
Originally Posted by balane View Post
Could he do a little surgery on the speakers and bi amp them? Two channels to two tweeters and two channels to two mids? Would that help output increase?
Honestly you're only going to get so much from HU power. Just get a pair of speakers with good sensitivity and be done with it.
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Old 09-18-2009, 01:55 PM   #13
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actually you can use the rear outputs on some pioneer to feed subs, not sure if they still do that now.
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Old 09-18-2009, 05:26 PM   #14
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Misconceptions about HU amps.

1. They dont put out 50 watts per channel, even if they say they do. Most put out 10, 15, maybe 20 watts rms. IC chips can only put out so much power. Some HU's have Mosfet power amps built in but they can still burn out from excessive heat buildup.

2. HU amp power ratings are measured in independent channel output. What this means is that each channel is ran by itself, (mono) then the output on that one channel is measured and multiplied by 4 to give a big impressive number for some chump looking at Pioneers and Kenwoods at Best Buy. By no means will a given HU actually deliver 20 rms of power to all 4 channels. For that, you need the big heat sink and power supply of an outboard amplifier.

So, just drive two speakers with two stereo channels, that's what is best for your equipment. and dont worry, there really isnt any "wasted" energy because u arent using the rear channels. If anything, the HU amp will sound better like this due to less heat buildup, which really is wasted energy. There is also something to be said for efficient speakers and outboard amps. They don't have to be that expensive, depending on what you find online or on ebay.
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