Running passive speakers directly from a pre-amp? Doesn't sound like a good idea to me. I disagree in general, though.
Connecting the sub to the WiiM Ultra will enable you to high pass filter the signal to the C368 (no bass duties) and low pass filter the signal to the Gravis I fully symmetrically. This is the key to perfectly blended integration between mains and sub!
Well isn’t the signal for the main speakers leaving the preamp, going to passive or active speakers? So that’s what I meant, either a preamp with sub out, or the high level output from the amp.
Yes, I also prefer and use the outputs from the preamp, but some people like REL believes using the amp outputs has advantages.
You are right, that's what they keep writing into all their manuals. And BK Electronics as a former REL contract manufacturer kind of picked this up. However, all this stems back from the times when stereo equipment did not have proper subwoofer management. Integration of mains and subs was often a gamble then and a lot of highly questionable recommendations from that area are still around (like "matching" the sub's crossover setting to the "lower frequency limit" of the mains, as if anybody could tell that from a glossy brochure).
One of the biggest advantages of adding a subwoofer is releaving the main speakers from their bass duties, thus not only extending the bass to lower registers but also reducing distortion of the mains.
Use the sub out on the nad. Then adjust the sub accordingly. Phase, crossover, volume
That also depends on the speaker. So I don’t really agree with that. That’s just my opinion. For example, what if you have a speaker that goes down flat to 30 Hz and you have a Rel sub that goes down to 11 hertz -3 bd down. Why would you want to cross over a speaker that goes down to 30 Hz at 80 to 100 hertz and then try to tuck the sub underneath it, you’re going lose some midbass punch. And mess up the midrange which will effect overall sound of the speaker. Especially in the vocal region
Could you give some more details? You're free to have an opinion but I'd like to understand how you ended up there.
Run the NAD full range through the pre-outs/sub out and connect to your sub, then adjust the subs phase, crossover, volume and position. Also, are you talking for music or home theater? If you were talking about music only, it would be a huge mistake to limit your speaker running full range and having a natural roll off and adding the sub to it, you’re simply tucking the sub underneath the speaker when it’s playing full range.
It's not my amp, I'm asking out of curiosity.
That’s an opinion
After having a short look at the C 368's manual things seem even more complicated.
The amp has a pre-out which can be set to either sub or pre-out mode. The manual doesn't stete the difference so. Is there aloe pass filter? The answer might be found in the settings, it's missing from the manual.
The.same goes for the speaker output. There is a high pass filter setting "up to 300 Hz". Is it synched with the low pass? Again, the manual won't tell.
Best to look up what's available in the actual settings. If the Ultra is to be used as a pure streaming source and other sources are connected to the C 368, it might actually be better to connect to its sub out.
Again, it also depends on whether using it for music or home theater and your way you would really want two subs because you’re having to crossover higher because of the way you’re crossing over the mains. By taking away their full range abilities
An opinion based on the difficulty in matching the speaker natural roll off to the sub low pass filter. I could never get mine sounding right before I got the WiiM Amp.
Here are my Sonus, Faber Extremas running them full range and using to Rel Stentor 3’s crossed over at 28 Hz to fill in the bottom low frequencies. The Rel Stentor is rated I believe 220 hz-11 hz -3 DB down in room.
