Threshold 400A

Airedale · 16th January 2005, 07:52 AM

I have a 400A but have long lost the manual - LOL. Can anyone tell me if this Amp can be easily bridged for a mono application ? If so can you tell me how to bridge it ? Will the unit still operate as Class A in Mono mode ? Thanks !

Nelson Pass · 17th January 2005, 09:26 PM

If you have a source with 2 phases (+/-) also known
as a balanced source, you can feed each into an input
and operate the amplifier bridged. It will leave Class A
at some point short of 400 watts into 8, but I don't recall
offhand what that point might be.

If you don't have a balanced signal source, it is possible to
tap the output of one channel into the (-) input of the
differential pair of the other channel, but this gets a little
technical.

Airedale · 17th January 2005, 10:57 PM

Thanks for the info Nelson !!

16th January 2005, 07:52 AM	#1
Airedale diyAudio Member Join Date: Jan 2005 Location: Above ground	Threshold 400A I have a 400A but have long lost the manual - LOL. Can anyone tell me if this Amp can be easily bridged for a mono application ? If so can you tell me how to bridge it ? Will the unit still operate as Class A in Mono mode ? Thanks !

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17th January 2005, 09:26 PM	#2
Nelson Pass The one and only Join Date: Mar 2001	If you have a source with 2 phases (+/-) also known as a balanced source, you can feed each into an input and operate the amplifier bridged. It will leave Class A at some point short of 400 watts into 8, but I don't recall offhand what that point might be. If you don't have a balanced signal source, it is possible to tap the output of one channel into the (-) input of the differential pair of the other channel, but this gets a little technical.

17th January 2005, 10:57 PM	#3
Airedale diyAudio Member Join Date: Jan 2005 Location: Above ground	Thanks for the info Nelson !!

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