How do you bridge two bridged amplifier? - Page 3

AudioFreak · 2nd October 2003, 01:19 PM

The purpose of my post above was simply to provide the pic. Both amps are fed the same non-inverted signal. BTW, the X1000 uses an extra box which is basicly a bunch of isolation transformers before the inputs to allow such operation. Internally the X1000 has no Earth connection except on the case which is isolated from the circuit. The downside of this whole idea is that if the amps are slightly different in terms of frequency response or in the time domain, the output will get messed up to some extent.

UrSv · 2nd October 2003, 01:40 PM

Quote:

Originally posted by AudioFreak
The purpose of my post above was simply to provide the pic. Both amps are fed the same non-inverted signal. BTW, the X1000 uses an extra box which is basicly a bunch of isolation transformers before the inputs to allow such operation. Internally the X1000 has no Earth connection except on the case which is isolated from the circuit. The downside of this whole idea is that if the amps are slightly different in terms of frequency response or in the time domain, the output will get messed up to some extent.

Thanks. As I said I had no idea how the X1000 was set up but they would need to be like that or similar to do it.

thylantyr · 2nd October 2003, 04:11 PM

Here is a simple representation of two channels bridged.
We know this works.

thylantyr · 2nd October 2003, 04:12 PM

Here is two bridged amplifiers in series.

Assume the power sources are individual batteries.

Will this work ?

thylantyr · 2nd October 2003, 04:20 PM

http://www.carsound.com/ubb/ultimate...c;f=1;t=022066

Zapco Dave II posted;

In order to bridged two amplifiers, said amplifiers have to be single rail (dedicated mono) units. A bridging module is not necessarily needed, but it is CRITICAL that the gain structure for each amplifier is as close to identical as possible! Matching gains cannot be done by simply positioning each gain control in similar positions. There are several steps that need to be taken in order to do this correctly.

My advice would be to contact the manufacturer technical supoort folks to get the correct information for bridging two of their amps together.

thylantyr · 2nd October 2003, 09:53 PM

We got a response;
http://www.carsound.com/ubb/ultimate...c;f=1;t=022066

Originally posted by Zapco Dave II:
In order to bridged two amplifiers, said amplifiers have to be single rail (dedicated mono) units. A bridging module is not necessarily needed, but it is CRITICAL that the gain structure for each amplifier is as close to identical as possible! Matching gains cannot be done by simply positioning each gain control in similar positions. There are several steps that need to be taken in order to do this correctly.

My advice would be to contact the manufacturer technical supoort folks to get the correct information for bridging two of their amps together.
--------------------------------------------------------------------------------

Richard Clark;
not true at all---------bridging two different amps is not much different than putting a 12 volt battery in series with a 6 volt battery to obtain 18 volts............RC

more

http://www.carsound.com/ubb/ultimate...1;t=001731;p=6

Richard Clark;
guys------its been so long and i have been so busy i can't even remember what has been covered and what hasn't-------at any rate i have no chance to spend much time on it now------a universal module that will work for any amp??????--------pretty difficult------or should i say rather complex in that such a versatile design would run the cost for most applications out of reason---------that is not to say that it cannot be done-------like i have stated-------ANY pair of amps can be bridged------some with better results than others-------amps are nothing more than "AC batteries" but unlike batteries they have more than 2 terminals------its the "other" terminals that can get you into trouble if you don't know what you are doing------i can easily bridge any two amps in a matter of minutes with no problem------if you have a pair that needs to be done badly enough then bring them to autosound and i guarantee that i can have any pair of amps bridged and working in 10 minutes or less or i'll pay you $1k for your trouble.................RC

purplepeople · 2nd October 2003, 10:17 PM

Quote:

Originally posted by thylantyr
http://www.carsound.com/ubb/ultimate...c;f=1;t=022066

Zapco Dave II posted;

In order to bridged two amplifiers, said amplifiers have to be single rail (dedicated mono) units. A bridging module is not necessarily needed, but it is CRITICAL that the gain structure for each amplifier is as close to identical as possible! Matching gains cannot be done by simply positioning each gain control in similar positions. There are several steps that need to be taken in order to do this correctly.

My advice would be to contact the manufacturer technical supoort folks to get the correct information for bridging two of their amps together.

In general when bridging PA power amps, the gain is set to max so as to match them as closely as possible and levels set with the preamps or mixers.

:)ensen.

sss · 2nd October 2003, 10:32 PM

hellow guys

if u are talking about car amps then :

car battery is 12V so normal car amp will give u 12Vp-p (or 10-11Vp-p to be more accurate)
bridging two amps will give u 24Vp-p and thats it , u cant connect 2 bridged amps in series and get higher voltage (-higher power)
paralleling amps? well its possible , but why ? its better paralleling only the output transistors .

bridging 2 amps will give u higher voltage
paralleling 2 amps will give u higher current

thylantyr · 3rd October 2003, 03:19 PM

Quote:

Originally posted by sss
hellow guys

if u are talking about car amps then :

car battery is 12V so normal car amp will give u 12Vp-p (or 10-11Vp-p to be more accurate)
bridging two amps will give u 24Vp-p and thats it , u cant connect 2 bridged amps in series and get higher voltage (-higher power)
paralleling amps? well its possible , but why ? its better paralleling only the output transistors .

bridging 2 amps will give u higher voltage
paralleling 2 amps will give u higher current

There are car amplifiers that run off the single +12v
battery, but there are also car amplifiers that have
high frequency switching power supplies (DC-DC converters),
12v input, +/- rail voltage output with isolated ground.

LukasLouw · 3rd October 2003, 03:58 PM

"There are car amplifiers that run off the single +12v
battery, but there are also car amplifiers that have
high frequency switching power supplies (DC-DC converters),
12v input, +/- rail voltage output with isolated ground."

99% of car amps with switching supplies out there have no more than 1KOhm isolation between speaker and 12 volt grounds. The latest trend that I notice, is to connect speaker ground directly to 12 volt ground, with a diffferential input stage to break ground loops.

Lukas

2nd October 2003, 01:19 PM	#21
AudioFreak Warp Engineer On Holiday Join Date: Oct 2001 Location: Queensland, Australia	The purpose of my post above was simply to provide the pic. Both amps are fed the same non-inverted signal. BTW, the X1000 uses an extra box which is basicly a bunch of isolation transformers before the inputs to allow such operation. Internally the X1000 has no Earth connection except on the case which is isolated from the circuit. The downside of this whole idea is that if the amps are slightly different in terms of frequency response or in the time domain, the output will get messed up to some extent. __________________ - Dan

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2nd October 2003, 04:20 PM	#25
thylantyr diyAudio Member Join Date: Feb 2001 Location: Mars	http://www.carsound.com/ubb/ultimate...c;f=1;t=022066 Zapco Dave II posted; In order to bridged two amplifiers, said amplifiers have to be single rail (dedicated mono) units. A bridging module is not necessarily needed, but it is CRITICAL that the gain structure for each amplifier is as close to identical as possible! Matching gains cannot be done by simply positioning each gain control in similar positions. There are several steps that need to be taken in order to do this correctly. My advice would be to contact the manufacturer technical supoort folks to get the correct information for bridging two of their amps together.

2nd October 2003, 09:53 PM	#26
thylantyr diyAudio Member Join Date: Feb 2001 Location: Mars	We got a response; http://www.carsound.com/ubb/ultimate...c;f=1;t=022066 Originally posted by Zapco Dave II: In order to bridged two amplifiers, said amplifiers have to be single rail (dedicated mono) units. A bridging module is not necessarily needed, but it is CRITICAL that the gain structure for each amplifier is as close to identical as possible! Matching gains cannot be done by simply positioning each gain control in similar positions. There are several steps that need to be taken in order to do this correctly. My advice would be to contact the manufacturer technical supoort folks to get the correct information for bridging two of their amps together. -------------------------------------------------------------------------------- Richard Clark; not true at all---------bridging two different amps is not much different than putting a 12 volt battery in series with a 6 volt battery to obtain 18 volts............RC more http://www.carsound.com/ubb/ultimate...1;t=001731;p=6 Richard Clark; guys------its been so long and i have been so busy i can't even remember what has been covered and what hasn't-------at any rate i have no chance to spend much time on it now------a universal module that will work for any amp??????--------pretty difficult------or should i say rather complex in that such a versatile design would run the cost for most applications out of reason---------that is not to say that it cannot be done-------like i have stated-------ANY pair of amps can be bridged------some with better results than others-------amps are nothing more than "AC batteries" but unlike batteries they have more than 2 terminals------its the "other" terminals that can get you into trouble if you don't know what you are doing------i can easily bridge any two amps in a matter of minutes with no problem------if you have a pair that needs to be done badly enough then bring them to autosound and i guarantee that i can have any pair of amps bridged and working in 10 minutes or less or i'll pay you $1k for your trouble.................RC

2nd October 2003, 10:32 PM	#28
sss diyAudio Member Join Date: Jul 2003 Location: Israel , haifa	hellow guys if u are talking about car amps then : car battery is 12V so normal car amp will give u 12Vp-p (or 10-11Vp-p to be more accurate) bridging two amps will give u 24Vp-p and thats it , u cant connect 2 bridged amps in series and get higher voltage (-higher power) paralleling amps? well its possible , but why ? its better paralleling only the output transistors . bridging 2 amps will give u higher voltage paralleling 2 amps will give u higher current

3rd October 2003, 03:58 PM	#30
LukasLouw diyAudio Member Join Date: Sep 2002 Location: Colonia, NJ	"There are car amplifiers that run off the single +12v battery, but there are also car amplifiers that have high frequency switching power supplies (DC-DC converters), 12v input, +/- rail voltage output with isolated ground." 99% of car amps with switching supplies out there have no more than 1KOhm isolation between speaker and 12 volt grounds. The latest trend that I notice, is to connect speaker ground directly to 12 volt ground, with a diffferential input stage to break ground loops. Lukas