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Old 26th June 2002, 08:48 AM   #1
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Default Bridging channels in car amplifiers

Hallo, Anybody can explain me waht the meaning of bridging channels at amplifiers ? I really dont understand.
I would appriciate if someone can explain me. Thank you
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Old 26th June 2002, 08:59 AM   #2
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Bridging basicaly means to make the amplifier mono. So you have one channel with twice the power, and a single input.
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Old 26th June 2002, 10:03 AM   #3
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And the way this is done is the input on one channel is inverted, so it is 180 degrees out of phase with the other channel. You then take the output from between the two channel's + output terminals, output ground is not used. You get twice the signal voltage this way, so 2 bridged channels delivers twice the power into twice the impedance as 1 channel, and almost 4 times the power into the same impedance (if the amps can handle it). Many or most car amps are already set up to run in bridge mode (the channels are already out of phase, I guess) just by connecting the speaker between the terminals labeled as such. (- doesn't always mean signal ground on those things.)
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Old 27th June 2002, 06:55 PM   #4
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You can check out Mr Elliot's article on

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Old 18th October 2005, 07:57 PM   #5
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Question How Do i Bridge subs

i want to bridge 2 subs on a 2 channel amp how much watts would come out of each subs if it was a 1200 watt amp. it is a sony 1200 watt amp, and i have 2 12" pineer subs, that are 660.

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Old 18th October 2005, 08:16 PM   #6
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Since it's a Sony (a bad thing), I figure you'd get about 800W from it.

Edit to note: if it wasn't clear, I meant total, not per.
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Old 18th October 2005, 08:30 PM   #7
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If it's a 2 channel amp, and you have two subs -- one on each channel, you won't gain anything from bridging unless you connect the subs in parallel, but that will fry your amp.
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