Phase Linear 400 bridged mono?

wondergt · 13th November 2009, 02:13 PM

Does anyone know if or how a Phase Linear 400 can be bridged mono? I picked one up resently at a good price and would like to use it as a subwoofer amp. Thanks

Original Burnedfingers · 13th November 2009, 09:41 PM

You will need to make a bridging adapter

wg_ski · 14th November 2009, 02:15 AM

And put in MJ21194 outputs and a fan on the heatsink, if you intend to bridge into 4 ohms.

Original Burnedfingers · 14th November 2009, 02:22 AM

An 8 ohm bridged load would be acceptable ....not a 4 ohm load

wondergt · 14th November 2009, 01:42 PM

Thanks for the response. I plan to drive an 8 ohm dvc subwoofer. Question: The input into the PL amp will be an LFE signal from my HK amp. The LFE signal in mono (below 120Hz). It seems to me that to invert the second channel, I just need to invert the polarity. Your thoughts?

CBRworm · 14th November 2009, 02:35 PM

If it's a DVC, couldn't you run one voice coil from each amp channel and supply the signal in phase to both inputs?

assuming the ground shields of both RCA's are tied together, to invert the polarity to one channel is NOT done by switching the center pin and the shield - you need to actually invert the signal.

wondergt · 14th November 2009, 04:25 PM

Yeah, I had a brain cramp on that one. I thought of running each voice coil with a seperate channel but they are 4 ohm vc. Can anyone recommend a bridge adapter? I would rather buy a complete unit than build one but...it thats what it takes.

wg_ski · 14th November 2009, 08:47 PM

If they are dual 4 ohm, just one one VC to each channel. It's the same load as running 8 ohm bridged. No mods needed at that load.

If you wanted a pre-made bridging adapter, you can use something like an ART cleanbox, which converts unbalanced to balanced. Just run one side to the hot, one to the cold and you're good. You will get slightly more power at low frequency from bridging the amp as opposed to running 2-channel, but it's not strictly needed with a dual 4 ohm VC.

PLs are pretty easy to work on, and one channel can be strapped for unity gain inverting, and run off the master channel.

13th November 2009, 02:13 PM	#1
wondergt diyAudio Member Join Date: Nov 2009	Phase Linear 400 bridged mono? Does anyone know if or how a Phase Linear 400 can be bridged mono? I picked one up resently at a good price and would like to use it as a subwoofer amp. Thanks

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13th November 2009, 09:41 PM	#2
Original Burnedfingers diyAudio Member Join Date: Nov 2002	You will need to make a bridging adapter

14th November 2009, 02:15 AM	#3
wg_ski diyAudio Member Join Date: Oct 2007	And put in MJ21194 outputs and a fan on the heatsink, if you intend to bridge into 4 ohms.

14th November 2009, 02:22 AM	#4
Original Burnedfingers diyAudio Member Join Date: Nov 2002	An 8 ohm bridged load would be acceptable ....not a 4 ohm load

14th November 2009, 01:42 PM	#5
wondergt diyAudio Member Join Date: Nov 2009	Thanks for the response. I plan to drive an 8 ohm dvc subwoofer. Question: The input into the PL amp will be an LFE signal from my HK amp. The LFE signal in mono (below 120Hz). It seems to me that to invert the second channel, I just need to invert the polarity. Your thoughts?

14th November 2009, 02:35 PM	#6
CBRworm diyAudio Member Join Date: Jan 2007 Location: S. Florida	If it's a DVC, couldn't you run one voice coil from each amp channel and supply the signal in phase to both inputs? assuming the ground shields of both RCA's are tied together, to invert the polarity to one channel is NOT done by switching the center pin and the shield - you need to actually invert the signal.

14th November 2009, 04:25 PM	#7
wondergt diyAudio Member Join Date: Nov 2009	Yeah, I had a brain cramp on that one. I thought of running each voice coil with a seperate channel but they are 4 ohm vc. Can anyone recommend a bridge adapter? I would rather buy a complete unit than build one but...it thats what it takes.

14th November 2009, 08:47 PM	#8
wg_ski diyAudio Member Join Date: Oct 2007	If they are dual 4 ohm, just one one VC to each channel. It's the same load as running 8 ohm bridged. No mods needed at that load. If you wanted a pre-made bridging adapter, you can use something like an ART cleanbox, which converts unbalanced to balanced. Just run one side to the hot, one to the cold and you're good. You will get slightly more power at low frequency from bridging the amp as opposed to running 2-channel, but it's not strictly needed with a dual 4 ohm VC. PLs are pretty easy to work on, and one channel can be strapped for unity gain inverting, and run off the master channel.