Question on gain setting when bridged

jtfoo · 16th July 2004, 06:21 AM

I'd liked to build a multichannel amp(using LM4780) for home theatre (HT). I intend to parallel/bridged the front left/right and centre channels. While the surrounds channel will be single ended chip. Since it going to be for HT purposes, I'd want all channel to have the same gain.

Say, I configured the gain of the surround channels to 20. What will be the gain to be configured for each chip amp that are to be used in the bridge/parallel configuration so that the final gain from them will also be 20? I'm thinking since they are bridged, I should configure the gain to be 10 for each chip amp, since voltage swing will be doubled. Not too sure though.

squadra · 16th July 2004, 11:06 AM

Yes, the gain is doubled in bridged mode.
According to the application information gain should be between 10 and 50 (see page 17 of this doc .)
Maybe a gain of 10 is too close to the limit, I think you would be better of choosing 30 as gain for the singular devices and 15 for the bridged versions.

jtfoo · 16th July 2004, 02:21 PM

Thanks Squadra.. Just the info I needed to get started.

16th July 2004, 06:21 AM	#1
jtfoo diyAudio Member Join Date: Jan 2003 Location: Singapore	Question on gain setting when bridged I'd liked to build a multichannel amp(using LM4780) for home theatre (HT). I intend to parallel/bridged the front left/right and centre channels. While the surrounds channel will be single ended chip. Since it going to be for HT purposes, I'd want all channel to have the same gain. Say, I configured the gain of the surround channels to 20. What will be the gain to be configured for each chip amp that are to be used in the bridge/parallel configuration so that the final gain from them will also be 20? I'm thinking since they are bridged, I should configure the gain to be 10 for each chip amp, since voltage swing will be doubled. Not too sure though.

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16th July 2004, 11:06 AM	#2
squadra diyAudio Member Join Date: Dec 2003 Location: only in your mind.	Yes, the gain is doubled in bridged mode. According to the application information gain should be between 10 and 50 (see page 17 of this doc .) Maybe a gain of 10 is too close to the limit, I think you would be better of choosing 30 as gain for the singular devices and 15 for the bridged versions.

16th July 2004, 02:21 PM	#3
jtfoo diyAudio Member Join Date: Jan 2003 Location: Singapore	Thanks Squadra.. Just the info I needed to get started.

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