Well it worked out pretty good.

3 rows 8 seats. Although 4 seats in the front are kids seats and are probably going in the games room.
Still, nice line of site for 4 adults, just don't stand up on the stands holding the seat...I need a sturdy 10" high stair.

What kind of ceiling tiles are those?

CGC R2315.
Pretty basic acoustic tile. Nice weight and thickness to them. And they're fire rated.

The 2 seconds I got sounded pretty nice.

Oooh, pretty.

I did a bad thing.....but it seems to be working.
It nagged me for a few days and I did it.

The addition of the 20" high shelves allowed me to place 2 subs below the rear seat but I didn't run them from the sub out. I've used my QS8' s as side surrounds set as large speakers and using the high pass filter in the first sub while daisy chained.
It took a fair bit of fine knob control/adjustment over the last few nights but it's pretty nice.

With the front two subs volume set lower and these two, also set lower, I have less boom and more tactile feel in my seats. Less noise, more smile/immersion.

I need to rerun YPAO for the other positions and work with it a bit more tomorrow but I have to say it was worth the effort.

4 adult seats in 2 rows in a narrow room, no obstructions from the front row with people seated.

Next...

This may have been covered before, but what subs are you running? If I had 4 subs going properly in my old room my teeth would've fallen out. Pretty cool idea to send surround info to subs right under you.

Not that your buying... but multiple sealed dude. Zero boom. All tactile. Super cool!

I know that the question is out there for brwsaw, but I've got 2 large ported subs up front behind my screen. They don't come across as "boomy" at all, but even so, I plan to some day add a 3rd sub, to the back of the room. That one will most likely be sealed if possible to add just the "punch" factor. I also have Bass Shakers in each seat (with their own filters so that they only "play" below 50Hz so that they aren't vibrating with all of the stuff between the normal 80Hz sub/LFE and 50Hz) that add to the tactile feel.

Can you ever have too many subs? LOL

Oh yeah, for sure you can have exceptional performance from dual porteds. There is just something "ninja like" about sealed subs.

I have done it both ways. Porteds go louder for sure. But man, to have that bass crack you in the chest, then completely dissappear, is really something else. IMO sealed units give the impression of a more dynamic experience -because there is no port lag or drone. Some call the experience "room lock" or sitting in the "poweralley". To get a similar tactile response from porteds you have to crank it loud. I think this may be the "noise" factor byproduct brwsaw is referring to. It gets to the blaring point I guess.

Here is a point to take it home. I would sooner not have ATMOS than go back to a ported setup.

4 subs, all different. I can't here the hiss from the 1 from below the shelf so I left it connected.

I am interested in the new EP400 combo units to replace all of them.

I got the first ported one because I had a large CuFt space to fill, could only buy 1 sub, and needed a lot of LFE power for my $850 that I spent. The port gives you that for large spaces like that.

I then added a "twin performing" DIY sub to try to keep things identical. That smoothed out the room nodes a decent amount, and also meant that I could run both of them at a lower gain than one alone, meaning less air pushing and pulling through the port.

Sealed subs or much more musical of course, and can give a tight "punch to the chest" feel, which is why I am wondering if adding a 3d sub, but one that is sealed, will play well with the others.

It was a leap of faith when I decided to go sealed. So many people advise the opposite, and they are 100% right for large or open rooms. To get LFE effects you need raw spl output first. Sealed is more $ for the same spl output (more/bigger subs) so its really a question of what is practical for space and $ I think.

Sealed subs typically tune lower frequencies, can hit lower notes in a box of comparable size.
I'm fairly sure that thought isn't one of the many myths about sealed subs, but i haven't read on them in some time though Audioholics notes on it say something different (i think).
http://www.audioholics.com/loudspeaker-design/sealed-vs-ported-subwoofers

A summary of opinions that SVS has on their webpages:
http://www.svsound.com/t/sealed-vs-ported

Good articles Chess.

Hey brwsaw, have you heard any specifics on when/how much the new ep400 tandems are expected? Hopefully they come in under 1700$. Would be compeition for other dual promotions out there.

I'd love for Axiom to knock this one out of the park, as dual subs are really spectacular.

What I got from those articles is that sealed rolls off more slowly the deeper you go, but ported has more output (SPL) down to its roll off (which is much sharper, but can be just as deep with the appropriate ports and size).

You bring up a good point though. All comparisons are of smaller sealed subs vs. larger ported ones. Where are the comparisons of the large sealed vs same sized large ported?

All in all, a good sub is a good sub. By reducing issues with my room (bass traps and acoustical treatments) plus adding a second sub (both are ported) I've noticed a lot more "punch" to my bass and that is great. I wouldn't say that the bass response in my room is "boomy" at all or as my wife puts it "flabby sounding." I am only assuming that I would get even MORE punch/kick if I added a sealed sub to the mix. Then I would hopefully have the best of both, and hopefully not some strange acoustical weirdness. LOL

Thanks for those 2 articles. Good stuff.

I had an overly long winded post lined up and deleted it. If you lived closer Nick, I'd lend you mine to try. They are boxed up anyways.

The rolloff in sealed is made up by better room gain. There is a thread at HTS where 2 sealed subs dug down to 9hz in a room your size at over 90db. This only works in enclosed spaces of reasonable size. I'll try to dig up a link. Cool stuff.

Here it is. Graphs and iterations galore. A cool thread for sealed info.

http://www.hometheatershack.com/forums/svsound/77026-dual-sb-2000s-flat-10hz.html

I have no reason to suspect Axiom sealed units would perform at anything less than these tests suggest. Two ep500s sealed would probably be similar to the test here. Maybe even 2 ep400s.

Hey, I'm not switching. Too much time and energy in my 2 ported subs that I really like. So stop trying to convince me. LOL

I've always wondered what would happen if I "plugged the ports" on my 2 subs? Might have to play with that someday.

Have we derailed this thread enough to meet normal Axiom forum standards?

Nothing yet, just what's been posted here.

At the moment I'm working with a 12", 2x10" and an 8" sub. 2 ported, 2 non, each paired with its polar opposite (my best ported with the worst non, the best non ported with the worst ported).

Today I had time to scale down the screen size and adjusted the image to suite.

FWIW, I'd be willing to power the new subs with a separate amp. Not sure if there might be some savings there, 1 amp to 2/3/4 subs.

Note that room gain affects ported and sealed subs equally. The slower rolloff inherent in the sealed sub(not taking into account room gain)can make for a more extended bass response after room gain is factored in.

This thread isn't ending until you do.

We moved the seats around. Again. The lazy boys ended up up top with the love seat in/as the first row.
It has potential. A lot.
Turns out the front row is perfect distance for my 2 channel listening and the rear for my gaming/viewing.
I havent listened to surround yet. In going back to the basics I turned off (had to disconnect) the surrounds and set up the front 3 for the new positions (AVR only) and listened. A little fine tuning in the AVR and 1 hours viewing (and gaming) later I can't wait to finish it up.
I still have to bolt the 20" high risers together, to the seats, to re run my rear subs from the LFE out and reinstall the side surround connections on the back of the AVR.

Its hard to tell from the pics, but does your screen have a frame? I'm trying to figure out if its just hanging from a piece of rod or timber and weighted at the bottom.

Also, are their stairs or a step stool at one side of the riser? Its impressive you had 3 rows at one point. You have done quite a lot for a modest budget I would guess. Cool.

2x4 frame,3 pieces. Box plus 2 triangular uprights/supports. There's a 2x4 on the wall that the supports slide under so it can't fall forward. This picture doesn't show the triangle support or the 2x4 on the base of the wall but should help.


I almost stayed inside the last budget...Considering the idea, I figure I've likely chewed through $20,000 for the room and everything in it. This over 4 years.
Bear in mind the PJ (PT-AE8000), PS4 and the new risers/shelves were free.
This room was started and completed last year (2014).

Thinking about the money I would have saved doing it all myself...
Ah well, it was nice to come home and not have to work on the room.

I have to say, don't compromise seat locations. I fought the current layout but now that it's done the seats are exactly where specified. Interestingly, every time I do this I am able to turn the overall volume down while hearing an overall improvement in immersion.

I need to get the image/focus back to where it was and mask the screen. This is my new goal for May. Complete the screen mitred/beveled framed/masking....I've seen what I want, now to put it all together (code for make more money so it can be done right, by someone else).

We were hoping for a bigger room sooner but we refused the offer to be moved and am now unemployed. The next few months should be interesting.