Originally Posted by giftedmd
Just curious what others think. I currently have a 7.4.4 setup with surround backs and 4 subs wired independently. I like what the MP-50 and room perfect do with the imaging of the bass frequencies front-to-back and side-to-side with 4 subs and that i dont have to use my mini-dsp because the MP-50 integrates them beautifully. But I dont think I notice the effect as much as i would expect, probably because during most action movies and stuff the LFE is also going to all 4 subs so that kind of overwhelms the more subtle bass imaging. I have the room for front wides. Would most people just go with the wides, wire the subs in stereo (group the two subs on the right side of the room together and the ones on the left side of the room together) and reintroduce the mini dsp? I guess the question is how much would the matrixed wides add to the setup compared to the added imaging of 4 independent aux subs vs 2 (stereo). Is it worth the cost and added complexity?
I can only answer parts of your question as I have not used matrixed wides:
I currently use the 4 aux sub option with 4x corner subs and I like what it does in terms of imaging, integration and frequency response. I agree that the "bass imaging" can be quite subtle on most movies with (too) strong LFE content although I still can feel and hear the bass moving (in all four directions) on some scenes (fast moving cars, helicopters etc). That's really fun! On some multichannel music the effect is even more evident.
After a lot of experimentation I have ended up with keeping this config. Also tried using only the LFE-output and a MiniDSP to set delays etc for each sub, but I prefer what the 4 aux option does... Still, Lyngdorf recommended very clearly to me to have corner subs only in the front
and not in the back. And ALL the way into the front corners! So with 4x subs, ideally we should stack 2x subs in the left and right front corners respectively, instead of having one in each corner. That's also how Steinway Lyngdorf seems to configure all of their high-end movie rooms, and this is what I will try in a new room I will build soon. In this case you would use only Aux 1 + 2 for subs, and each pair of stacked subs (Left and Right) can easily be calibrated as one without causing a mess in the impulse response or cancel each other out, as they are positioned on top of each other and will have the same delay and (almost) the same room response. But I know from a lot of measurements that this unfortunately will not work optimally in my movie room due to some heavy room modes with the front subs (peak around 30Hz and null around 60Hz), that not even RP can get completely rid of, but which cancel out nicely with rear subs in the mix. Something to consider in most rooms I think.
I do not feel any need for front wides (and I don't have the room for it) but there are a lot of people on this forum who really like it! And with the above stereo sub config at least you will have that option without the need for external DSP. Sorry I could not be of more help ;-)