Phase Linear 400 bridged mono? - diyAudio
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Old 13th November 2009, 02:13 PM   #1
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Default 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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Old 13th November 2009, 09:41 PM   #2
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You will need to make a bridging adapter
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Old 14th November 2009, 02:15 AM   #3
wg_ski is offline wg_ski  United States
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And put in MJ21194 outputs and a fan on the heatsink, if you intend to bridge into 4 ohms.
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Old 14th November 2009, 02:22 AM   #4
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An 8 ohm bridged load would be acceptable ....not a 4 ohm load
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Old 14th November 2009, 01:42 PM   #5
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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?
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Old 14th November 2009, 02:35 PM   #6
CBRworm is offline CBRworm  United States
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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.
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Old 14th November 2009, 04:25 PM   #7
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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.
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Old 14th November 2009, 08:47 PM   #8
wg_ski is offline wg_ski  United States
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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.
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