Marc A Media Room Remodel (II): Lessons learned
After receiving the S3000i I kept the same catacorner placement by stacking the S1500s (to look like a F25 or a S2500 if you will) up front and the S3000i in back.
I was so focused on frequency response that I was ignoring the waterfall and spectrogram measures. Catacorner placement was too boomy! The best thing I ever did was decide I was going to take the subs out of the corners at whatever the cost.
I have found that as you start to move subs away from the corners the FR doesn't change much. ¼ wall placements are considered to be almost as good as corners. It seems that the further from the corner the more positively decay is affected. Moving my subs out of the corners now enables me to place bass traps in the corners and positively effect SQ further. I am ordering traps for all 8 tri-corners from lasoundpanels.com
I wouldn't be surprised if changes in placement are likely to make a more significant difference in SQ than brand or servo between two like subs such as the S3000i and F25. People spend a lot of time looking at CEA-2010 numbers but not much time optimizing their room. The room is likely the biggest factor of a subwoofer's sound (among subs with similar capabilities).
Something changed when I moved the S1500s to ⅓ & ⅔ front wall positions and the S3000i midwall in the rear. The theee subs (4 15" drivers) along with the two 12" MBMs gave me something new, something satisfying: "surround bass".
"Surround bass" is hard for me to describe. It it more than non-localized bass but a feeling that bass is coming from all around you, and even from within you. "Bass envelopment" is probably a more appropriate term.
My hypothesis is that the additional bass envelopement is an advantage of running a combination of three or more subs both in front and behind the LPs. I believe
and others have experienced a similar effect from multiple subs.
My Mirage omnipolar speakers need breathing room, ~3ft from the walls. To allow for the middle entry door to open, my seating was placed closer to the rear wall than to the front.
We had planned to install a scope projection screen and JVC or Epson projector. I had a chance to view a JVC in a fully darkened room and the Epson 5040 w/SI Black Diamond screen in a room with some ambient light and the LG OLED65E6P. Well, I bought the OLED and put the projector on hold (laser light sources). I live in SoCal for the good weather and sunshine. I'm getting darkening shades but not blackout.
We were sitting too far away to truly appreciate the OLED. I decided to damn the middle french doors and take them out of commission! Because of my french doors, I have always been at the mercy of the doors when it comes to speaker, sub, and furniture placement. This allowed me not only to get the seating closer. But it gave another placement option for the S1500s now that the middle french doors don't open.
I misread/misinterpreted a post by Mark Seaton. I figured that by moving my S1500s to the sidewalls (adjacent) about ⅓ wall length I was making the room smaller. ⅓ and ⅔ placements worked on the front wall so why not.
The results are incredible, not due to the room shrinking (which it doesn't), but nearfield! A S1500s IS now ≤6m from any seating position. The tactile response has increased immensely as well as the bass envelopment. My wife sat in here just listening to REW sweeps last night.
My MBMs and TTs are not integrated yet and the difference is already night and day.