Originally Posted by graphicguy
Charles R.......that's the same way I do it. I had to go back in after I ran MCACC and knock down the vol setting in the SC....probably about 3db. I was a little concerned because my measuring position (which is also the main listening position) isn't equi-distant from the subs. The rest of the SPL I got fine tuned individually in each sub (again using the RS SPL meter) by using each sub's gain level.
MCACC set up actually split the distance between the two from the measuring/listening position, which is probably what I'd do if I set it manually.
I was also a little concerned that by splitting the LFE channel with a Y connector, that the signal would be degraded enough that neither sub would get enough of a signal to work properly. That was unfounded, though.
Thought it would be a bit tricky since the Phoenix is an 18" with 2-4" down firing ports. While the MFW uses a smaller driver (15") with a front firing slot port. I've heard some say that using multiple subs require you to use the same sub. That wasn't an issue, either.
MacFan.....the placement of the subs to where they sounded best happened to work out that way. That said, I had to replace an end table with the MFW. There just wasn't room for both. I'm having a piece of glass cut for the top of it so it does double duty as a sub and an end table.
I was using an Elemental Design eQ2 to tame some peaks. Now, I don't need to use EQ as everything smoothed out nicely by using two subs. I've got lots more headroom. Much more slam. And integration with my mains sounds much more seamless.
Haven't measured how low they go. But, my ears tell me I'm well below 15 Hz....especially with music that has information in the subsonic range.
While it makes no sense, I'm finding that I'm lowering the volume on the SC, playing the same material as I was before.
All-in-all, one of those ideas that actually paid off handsomely. That's something that I can't say regularly when I make changes in my HT.
I have an SMS-1, and it's graphic display makes it pretty easy to equalize the two (running one at a time, of course). It is a huge advantage for one person working alone.
I too was concerned about a mismatch, as space limitations forced me to use a box in one corner and a cylinder in the other. They are both SVS, but have different drivers and one fires to the side, the other down (ports up). Ed Mullin (SVS) reassured me that they'd blend well in my arrangement, and that's how it turned out.
I've used multi Y connectors in days gone by, at one time connecting three subs and a Buttkicker off one LFE output. The SMS-1 has three LFE outputs, so that is no longer a consideration, but I did learn the signal can be split quite a few times without a problem. (Although some subs' auto on feature might not work well.)
Like you, I found that two well placed (or kinda well placed, as in my case) subs could reduce or even eliminate the need for EQ. I still smooth things out with the SMS-1, but wouldn't absolutely have to. Still, the SMS-1 was so helpful helping me find both the proper volume and the correct phase settings to offset the fact that I couldn't relocate my subs, that it probably earned it's keep on the setup aspect alone. And it was magic while I had only one sub.