Subwoofer crossovers

Should work. Very similar to what I am doing. Only thing to keep in mind is that if you apply cross over to your mains in the meridian in MCH mode, AND you run a set of outputs from your preamp (I presume with HT bypass) through the NHT, you will get low pass information from your mains twice.

First on the LFE channel (crossed over in the Meridian), and once more from the stereo inputs in the NHT. This is certainly the case if you cross over in the Meridian while still running the mains at full range. But even if you apply a high pass filter to the mains in the Meridian, quite a bit of LF information will still be there (because of the slope of the filter) for the NHT to send to the subs (adding it to the LFE channel information).

The way around this would be to not use the Meridian crossover for the mains, but let the NHT do the work through the stereo inputs, even in MCH mode.

My Ref 3 has three stereo outputs, 2 that are adjusted by the volume control in all modes but HTpassthrough and/or processor input and one at a fixed output for recording. I plan on using the NHTx2 on one of the outputs from the Ref3 and the other is going straight to the amps for the Sarastro's. I will also be connecting the LFE output from the Meridian directly to the NHT x2's LFE input. I know I will have to adjustments but I should be able to make these adjustments in the Meridian setup for MCH mode. I will also setup the NHT crossover to duplicate the current setting I have set on the JL's front panal then defeat the JL's settings. I must make the adjustment in HT mode because making any other adjustment in 2 channel mode is unacceptable. The NHT x2 will only be conncted to the subs and not to the main speakers.

BTW are you having any issues with any type of noise when using the x2 or drop in fidelity.

I have the exact same configuration. Works beautifully - no noise, no drop in fidelity whatsoever. Only difference is use a MCH analog preamp instead of a SSP and apply no bass management in my SACD/BR player (I use source direct for SACD which bypasses the DSP).