Amplifier bridging question
I own a crestron cnampx 12 x 60 amplifier. I am really happy with how it sounds, but I am always curious to see what else it can do. I believe at some point you could purchase a bridging adapter:
http://www.crestron.com/products/model/CNXBRMO
But they were pricey and don't seem easy to find now.
**Question: to bridge, all I need to accomplish is inverting a rca (line level) signal, then connect preamp output to one channel (positive speaker out + terminal), connect inverted preamp output to another channel (negative speaker out from + terminal), correct? Could the preamp output/inverted output be derived from a custom y-splitter (1 connection with typical phase, 1 connection inverted)?
Please advise why that would not be ok, or a better way that would still be cost effective. Thanks for your help!
Posted Nov 25, 2017, 3:35 AM UTC
You need to use a unity gain pre-amp to flip the phase on one channel since the ground return is common on left-right channels, you can't just flip the polarity on one pre-amp output.
http://sound.whsites.net/project14.htm
Thanks for the reply. I feel like I have looked at those plans half a dozen times, but never quite figure out what to do. Maybe some basic questions would help get me started.
I am assuming the the circuit would be external like the cnxbrmo, correct? I would need to provide a 12v source? I assume that would be true for every pair of channels I would want to bridge?
"if interconnect leads are to be used from the adapter to the power amp, the 100 Ohm resistors shown must be placed in series with each output to prevent instability" - this just reinforces what is in the schematic, or does it mean something else?
Thanks again for the help