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Old 2nd March 2005, 09:21 PM   #1
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Default Class D bridging with this product

First post here, so bear with me.

I am looking for a way to bridge two identical (car)audio mono aplifiers 1 ohm stable.
Is it possible to use such a product?

http://www.bmm-electronics.nl/Produc...roduct_ID=3224

I understood that there might be a problem to power the above article, but can't this be done with the dc/dc convert inside of the amp?

Also regarding the common ground for the bridging (if possible?) Can't this just be connected together from each amplifer?

Would be nice if anyone could answer, as ordinary car audio people don't seem to have that much knowledge about it.

If charts over the aplifiers pcb's is needed to answer, I'd be glad to provide them.
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Old 2nd March 2005, 10:52 PM   #2
JohnW is offline JohnW  Hong Kong
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If I had to place a bet - I would say that the outputs of your amps. are already bridged - which means you cannot use 2 amps to increase power - unless you have a dual voice coil speaker - one amp per coil.

John
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Old 3rd March 2005, 03:51 PM   #3
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Hi there, the speaker is infact a 2 ohm dual voice coil woofer
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Old 3rd March 2005, 04:08 PM   #4
UrSv is offline UrSv  Sweden
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If your amps outputs are completely floating with respect the ground and positive then it might be possible to run them in series on the outputs to obtain twice the output voltage. Check the manual.
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Old 3rd March 2005, 08:11 PM   #5
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It doesn't state anything in the manual. But I'd be happy to post the chart over the PCB. I am not really that good at reading it myself.
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Old 4th March 2005, 06:17 PM   #6
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Anyone got a clue, before I start spending? Or maybe even another way to solve my problem?
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Old 6th March 2005, 12:13 PM   #7
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Quote:
Originally posted by JohnW
If I had to place a bet - I would say that the outputs of your amps. are already bridged - which means you cannot use 2 amps to increase power - unless you have a dual voice coil speaker - one amp per coil.

John

Hi john,
You are right about this amp, but there exist a way by which you can bridge an already bridged amp. but it requires seperate power supplies for the proper operation. Crown and Qsc [pl9.0] uses grounded bridge topology for this type of implementation.

regards,
kanwar
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Old 6th March 2005, 06:56 PM   #8
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Well, delighted to hear that it's possible with other products.
About the seperate power supply, what needs to be done? Can I use the above mentioned product, or are there any other ways to bridge an already bridged amplifier?

If anyone knows how to compress a pdf into a size that this forum allows, I'd be able to post the pcb chart. Unfortunately its 1,1 mb zipped.
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Old 8th March 2005, 01:59 PM   #9
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Lightbulb Hi buddy

Quote:
Originally posted by jaychocolate
Well, delighted to hear that it's possible with other products.
About the seperate power supply, what needs to be done? Can I use the above mentioned product, or are there any other ways to bridge an already bridged amplifier?


Hi chocolate_jay,
Its not possible with the mentioned product.
See the picture for more clarification on QUAD BRIDGING TOPOLOGY.
Hope you understand it.

regards,
kanwar
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File Type: jpg qbt.jpg (35.3 KB, 218 views)
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Old 8th March 2005, 02:32 PM   #10
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For those experienced enough, here's the chart over the PCB.

Sorry for the resolution
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File Type: gif velocity_2005_p1.gif (99.7 KB, 212 views)
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