Troubleshooting bridged Alpine amplifier
Originally Posted by WLAURENT,May 3 2006, 11:14 PM
Philip - when you need these types of things in small QTY's you need to ask for evaluation or demo parts to complete a project you are working on for your company................
ya know, you're right about that William... i should have thought of that... i do that all the time at work. even getting pumps worth $10k for trial runs, w/ the vendor hoping he can sell us a few dozen down the road.
and w/ the number of traditional XLR connectors and wiring we were buying from my normal cable house - i'm sure they'd have sent me a few... oh well.

re: stealing them?
not really my style. not to mention, these aren't something that your typical RShack would stock. heck not even the local instrument stores stock 5-pin XLR.
Originally Posted by Will,May 4 2006, 07:57 AM
don't mean to beat a dead horse here. But the reason this won't work is that channels 1 and 2 are being used to power ONE left speaker. Channels 3 and 4, ONE right speaker. When you bridge channels 1 and 2, you are merging the signal between the channel 1 and 2 inputs, eliminating any stereo imaging. connecting it in the way you describe also would not allow for fading left to right and vice versa. this is why the splitter is necessary and why the signal for the left speaker needs to go to 1/2 and right needs to go to 3/4.
disclaimer: I know this issue has been resolved but I am posting this to eliminate any confusion for someone who searches for this info in the future.
disclaimer: I know this issue has been resolved but I am posting this to eliminate any confusion for someone who searches for this info in the future.

Then I've selected 1+3/2+4 on the input switch on the amp.
thus, my statement was correct. he only needs to send signals to 1 of the 2 inputs for each bridged channel. if he is bridging 1+3 and 2+4, then he needs to send signals to 1 and 2. if he's bridging 1+2 and 3+4 (which is what REALLY is going on), signals go to 1 and 3 as you pointed out.
at the end of the day however, we are making the same point -- the OP's statements were just confusing, and i still believe (whether he intended it or not) he was making a mountain out of a mole hill.
However you'd call the mix-up would be up to you. And my posts may appear confusing, because the documentation was confusing.
I reiterate the problem was there a switch labeled 1+3/2+4 on the amp which is documented in the manual summing the inputs and sending to one output (which would be a lamen's interpretation of bridging if I've ever heard one). While there is a diagram later that describes a 2-channel system but nothing indicating if this was bridged operation.
Anyway I didn't write the manual, but hopefully this post will help someone down the road.
I reiterate the problem was there a switch labeled 1+3/2+4 on the amp which is documented in the manual summing the inputs and sending to one output (which would be a lamen's interpretation of bridging if I've ever heard one). While there is a diagram later that describes a 2-channel system but nothing indicating if this was bridged operation.
Anyway I didn't write the manual, but hopefully this post will help someone down the road.
I reiterate the problem was there a switch labeled 1+3/2+4 on the amp which is documented in the manual summing the inputs and sending to one output (which would be a lamen's interpretation of bridging if I've ever heard one).
bridging requires inverting the signal, which isn't mentioned, so that isn't much help.
i guess that's what we get: Japanese to Engrish translation...
you say that like it's a bad thing....
I agree.....this post was WAAAAY to long for something this simple....
John
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