Bridging channels in car amplifiers

suckew · 26th June 2002, 08:48 AM

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

PhaseShift · 26th June 2002, 08:59 AM

Bridging basicaly means to make the amplifier mono. So you have one channel with twice the power, and a single input.

Kilowatt · 26th June 2002, 10:03 AM

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.)

Unbeliever666 · 27th June 2002, 06:55 PM

You can check out Mr Elliot's article on http://sound.westhost.com/project14.htm

/Henrik

adidasboy069 · 18th October 2005, 07:57 PM

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.

Jesse

DonoMan · 18th October 2005, 08:16 PM

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.

richie00boy · 18th October 2005, 08:30 PM

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.

26th June 2002, 08:48 AM	#1
suckew diyAudio Member Join Date: Jun 2002 Location: Tangerang-Indonesia	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

18th October 2005, 08:30 PM	#7
richie00boy Did it Himself diyAudio Member Join Date: Nov 2003 Location: Gloucestershire, England, UK	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. __________________ www.readresearch.co.uk my website for UK diy audio people - designs, PCBs, kits and more

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
A question about bridging power amplifiers.	pietjers	Solid State	1	31st March 2009 10:27 AM
mismatch in bridging 2 channels	clovi_kate	Solid State	4	19th February 2007 12:00 PM
bridging channels on stereo reciever	9am53	Solid State	10	8th December 2005 03:16 PM
Bridging amplifiers	danbmellow	Solid State	2	13th October 2004 05:41 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

26th June 2002, 08:59 AM	#2
PhaseShift diyAudio Member Join Date: Jun 2002 Location: Illinois	Bridging basicaly means to make the amplifier mono. So you have one channel with twice the power, and a single input.

26th June 2002, 10:03 AM	#3
Kilowatt diyAudio Member Join Date: Nov 2001 Location: Harlowton, MT, USA	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.)

27th June 2002, 06:55 PM	#4
Unbeliever666 diyAudio Member Join Date: Dec 2001	You can check out Mr Elliot's article on http://sound.westhost.com/project14.htm /Henrik

18th October 2005, 08:16 PM	#6
DonoMan diyAudio Member Join Date: Feb 2005 Location: Massachusetts	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.