How to wire high level inputs to Behringer amp for subwoofer?

[johnp98]

Hello

I have a Behringer NX600D amp that runs two DIY VBSS 18" subs.
I have heard of the possible benefits for having the subs connected to the high level inputs (especially if focusing on 2 channel audio, which I am) and thus I wanted to give it a try.

Anyways I was hoping to get some advice on wiring and what I was thinking is:
Receiver --> A level / speaker outputs --> Speakers
Receiver --> B level / speaker outputs --> Behringer --> Subs

Question #1
The speaker outputs from the receiver had to be converted to an XLR input for the Behringer and thus I wired the positive to the positive xlr pin and the negative to the negative xlr pin and have nothing connected to the ground pin. Is that the proper way to do it? Or should one bridge the negative and the ground?


Question #2
The main issue that I am having is that the high level outputs are L and R and the inputs on the Behringer are also only L and R and there is no obvious way to combine the signal.
Thus sub #1 gets only the L signal and sub #2 only gets the R signal.

This is probably not too big of a deal, but it would be nice if the L&R signal could go to each sub.

So I was wondering should I just bridge the positive and negative B level outputs together and then run them to the L&R inputs? Or would this have any downsides? I know that one should not bridge the outputs and run it to a speaker as the load will be different and could blow the speaker/amp, but is running a bridged signal to the Behringer amp the proper way to it?

Any advice would be much appreciated on the wiring itself and also how to get both signals to both subs.

Thanks!

[billfitzmaurice]

I have heard of the possible benefits for having the subs connected to the high level inputs

I can't think of any. How are you low passing the subs and high passing the mains? As for L/R going to the subs, pretty much everything recorded since the 1980s has the content below 100Hz summed to mono, so there is no discreet L/R where subs are concerned.

[johnp98]

I can't think of any. How are you low passing the subs and high passing the mains? As for L/R going to the subs, pretty much everything recorded since the 1980s has the content below 100Hz summed to mono, so there is no discreet L/R where subs are concerned.

I am just running the mains as full range and then using the Behringer to low pass the subs. So making my own crossover point.

[Prana Ferox]

If you send speaker level inputs into the XLR jacks of the 6000D you will likely damage one or both boxes. Do you have preamp outs on your receiver? Or a sub out?

The amp will sum the A+B inputs for you internally, select BRIDGE mode to do this. The NX6000D documentation is atrocious but from the old 6000DSP manual:

"BRIDGE mode combines the signals from Inputs A and B into a blended mono signal and then routes the resulting mono signal through a single chain of DSP modules, leading to a combined mono output. The mono output signal is identical at Outputs A and B, and the amplifier responds to a single combined speaker load."

[johnp98]

If you send speaker level inputs into the XLR jacks of the 6000D you will likely damage one or both boxes. Do you have preamp outs on your receiver? Or a sub out?

The amp will sum the A+B inputs for you internally, select BRIDGE mode to do this. The NX6000D documentation is atrocious but from the old 6000DSP manual:

"BRIDGE mode combines the signals from Inputs A and B into a blended mono signal and then routes the resulting mono signal through a single chain of DSP modules, leading to a combined mono output. The mono output signal is identical at Outputs A and B, and the amplifier responds to a single combined speaker load."

Ok, yeah I will switch back to the LFE or the speaker pre outs and not use the speaker level outputs and use Bridge mode.

Thanks for the info!