Bridging Amps to run my SDA 1.2's

[Audio D]

I have a question for the forum members: I have 2 Adcom 555 amps I would like to use to drive my SDA 1.2's. I'm wondering if the amps will maintain common grounding when in bridged mode. Any guidance on this matter would be greatly appreciated.

[avguytx]

From what I understand...no they won't. You'll need the AI-1 Non Common Ground Interface cable to accomplish that. Maybe the Adcom amp owners will chime in soon.

[F1nut]

What he said, "no they won't."

[engtaz]

Trust me they will blow your drivers. Seen it done it. They could also blow your amps. I used 2- Adcom 555II and lost 8 drivers totals.



engtaz

[heiney9]

I have a question for the forum members: I have 2 Adcom 555 amps I would like to use to drive my SDA 1.2's. I'm wondering if the amps will maintain common grounding when in bridged mode. Any guidance on this matter would be greatly appreciated.

No they will not and you can't tie the neg. terminals together.

Depending on the year or SDA's/type of IC cable you have it *might* be possible to build the AI-1 cable.

[read-alot]

Trust me they will blow your drivers. Seen it done it. They could also blow your amps. I used 2- Adcom 555II and lost 8 drivers totals.



engtaz


Too bad you didn't have a friend in Tampa who knows everything that could have saved you. :D

[Audio D]

Thanks for all the great input. I re-read my owners manual last night and it said you could put a ground between the chassis's of the two amps in lieu of the AI 1 common grounding module. Can anyone tell me if the common grounding module is available from Polk? I have never seen one come up on any auctions so I'm sure it must be quite difficult to come by.

[heiney9]

Thanks for all the great input. I re-read my owners manual last night and it said you could put a ground between the chassis's of the two amps in lieu of the AI 1 common grounding module. Can anyone tell me if the common grounding module is available from Polk? I have never seen one come up on any auctions so I'm sure it must be quite difficult to come by.


Just for clarification you don't mean tying the neg terminals together on the 555's when each are run in mono? You CAN'T do that without blowing up the amplifiers.

Your best option is to contact Ken at Polk, he can send you instructions for building an AI-1 cable. Which SDA SRS 1.2's do you have? I don't have the compendium handy here at work but I believe you need to have a pin/blade SDA type connector on the 1.2's to be able to utilize AI-1 cable.

H9

[engtaz]

If you want I can send the email from Adcom tech support that said NO, under no circumstances do you tie the neg terminals together.

Just don't do it. That is why I posted in your thread. My friend did it to his SRS 2's and he lost 4 to 6 drivers out of 8 total. Maybe you will only blow 14 drivers out of 16 and also blow the amp the amps.

engtaz

[BrettT1]

Be very careful regarding bridging to mono. I constructed the homemade version incorrectly and blew an amp. I don't know if I just hooked it up incorrectly or what. Luckily the amp is all that toasted!!

[Audio D]

Does the same hold true for mono block amps, such as ADCOM 565's? I'm a bit confused as to what is meant by tie the negative terminals together. I also read this in the manual. For clarification, I own the 2.3 SRS's (I always get the 1.2's and 2.3's mixed up) and yes, it has the blade/needle terminal.

I'm hoping to purchase the compodium as a reference source.

[engtaz]

Mono block amps are different then bridged amps. Always ask the manufacturer if you can tie the negatives together.

engtaz

[Deadof_knight]

Simply run them in stereo and bi-amp them then all is good and youll like the way it sounds !!!!

[engtaz]

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