Hi Guys,
Hopefully someone can advise here, I have a Behringer A500 which I am currently using to drive a 12" DLS subwoofer, it's dual 4ohm coil.
Originally I wired in series for 8ohm, and set the amp for bridged mode.... I followed the instructions perfectly, but as soon as I flicked the "bridged mode" switch on the amp was behaving like the input op-amps were blown!! very low volume, buzzing, distortion etc. I was pretty much convinced it was stuffed, but I tried wired it back in stereo mode and turned the switch back to normal 'stereo" mode but the amp was still "blown"
Long story short, I pulled the amp apart and did some process of elimination to find the problem, when I left the "bridge mode" switch's flying lead unplugged and tried the amp again in stereo it was working again!! thank god!!
I'm currently running the amp in stereo mode driving each coil of the subwoofer with 1ch, using a miniDSP as active crossover.
It sounds fantastic at medium volumes, however when I start turning it up, i get hard clipping (like a slap) noise on big bass notes, however the LED VU lights are only lit up to 2/3rds of the way.
I am currently running the amp in a stereo (as opposed to mono) as I can't figure out how to do mono in the miniDSP 2x4?
I'm assuming at higher volumes the difference in output voltage between the channels is great enough to cause some feedback in the other voice coil, causing some kind of instability in the amp, and causing clipping / distortion in the amps feedback loop?
I guess the answer is to switch to driving the amp with two identical mono signals, but I'm not sure what the best way to do this is. is there a setting in the miniDSP 2x4 that I've missed to create a mono LFE channel(s)?
Cheers
James
Hopefully someone can advise here, I have a Behringer A500 which I am currently using to drive a 12" DLS subwoofer, it's dual 4ohm coil.
Originally I wired in series for 8ohm, and set the amp for bridged mode.... I followed the instructions perfectly, but as soon as I flicked the "bridged mode" switch on the amp was behaving like the input op-amps were blown!! very low volume, buzzing, distortion etc. I was pretty much convinced it was stuffed, but I tried wired it back in stereo mode and turned the switch back to normal 'stereo" mode but the amp was still "blown"
Long story short, I pulled the amp apart and did some process of elimination to find the problem, when I left the "bridge mode" switch's flying lead unplugged and tried the amp again in stereo it was working again!! thank god!!
I'm currently running the amp in stereo mode driving each coil of the subwoofer with 1ch, using a miniDSP as active crossover.
It sounds fantastic at medium volumes, however when I start turning it up, i get hard clipping (like a slap) noise on big bass notes, however the LED VU lights are only lit up to 2/3rds of the way.
I am currently running the amp in a stereo (as opposed to mono) as I can't figure out how to do mono in the miniDSP 2x4?
I'm assuming at higher volumes the difference in output voltage between the channels is great enough to cause some feedback in the other voice coil, causing some kind of instability in the amp, and causing clipping / distortion in the amps feedback loop?
I guess the answer is to switch to driving the amp with two identical mono signals, but I'm not sure what the best way to do this is. is there a setting in the miniDSP 2x4 that I've missed to create a mono LFE channel(s)?
Cheers
James
OK I think I've just answered my own question, seems I need a different plugin for the miniDSP.
The 2way Advanced 21 plugin is similar to the 2way Advanced plugin, but it also allows two of
the output channels to be summed together to provide a mono subwoofer feed. It is therefore
used to derive a mono subwoofer signal from a stereo signal, or to create “sub sat” systems. For
more information, see the datasheet. Note: in most applications, this plugin is superseded by
the 2x4 Advanced plugin (see above).
The 2way Advanced 21 plugin is similar to the 2way Advanced plugin, but it also allows two of
the output channels to be summed together to provide a mono subwoofer feed. It is therefore
used to derive a mono subwoofer signal from a stereo signal, or to create “sub sat” systems. For
more information, see the datasheet. Note: in most applications, this plugin is superseded by
the 2x4 Advanced plugin (see above).
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