Should I rearrange the four subwoofers?
 

I just got two more f113v2 (Thanks Ivan!). So I just put them on the inside of the XR100's. The mains are in an equilateral triangle of 11ft with the primary seating position. Thoughts?


https://www.audioaficionado.org/atta...7&d=1535554916






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Mark.......A qucik look in the JL Audio Fathom manual produced this page of suggested locations for a four subwoofer setup.


https://farm2.staticflickr.com/1848/...ab8ecdd6_b.jpg

Yep, its not possible to do anything close to that. They all have to be up front.

It's two subs on the inside, two on the outside, or stacked inside or out.

If I put the XR100's on the outside then it messes up my triangle...

Man that’s a lot of bass output.

Not sure why you’d want 4 subs up front.

My two f113s are sitting at 25% gain and that is plenty in terms of output.

Adding more subs can be tricky - but is really only for two reasons: exaggerated bass output or smoother room response.

I don’t think 4 up front will give you any smoother response than 2 up front.

If you can’t place two in the back (or to the sides) I’m not sure what to say.

2nd system?

I would one in each of your neighbors homes. :D

Should I rearrange the four subwoofers?
 

You have four subs. I agree with everyone’s comments here. It looks to me that you want to spread them around your room to correct low frequencies issues within your room.

I suggest that you do a google search about where to best position subwoofers in a room.

Send a picture of showing the rest of the room and folks may be able to make further suggestions.

I think your four subwoofers need two more TV screens to keep them company! :D :D :D :laughin: :lmao: :roflmao:

I would pull the main speakers a bit more into the room and use the top left diagram Dan posted.

Have you considered stacking the subwoofers in pairs?

A while back, another member stacked three pair of RELs at the front of the room

4 subs??? Another thought might be a different pair of mains that don't need quite that much help in the bottom end

With two subs I can reorganize the drinking glasses in the kitchen cabinets. I bought two more just for fun lol

Stack them two by two Gotham style. If you really want to take it a step further get the CR-1 and follow Barry Ober’s setup process. His setup process works... at least it did for me.

With your location constraints, my thought is you wasted a lot of $.

Here is the definitive paper on multiple subwoofer placement:
https://www.harman.com/sites/default...multsubs_0.pdf
If physical constraints prevent you from following this guidance - stack ‘em baby!

Just like an F212 or Gotham- the advantages of stacked subs are many- better balance and room coupling being foremost.

Tom

+1

I think stacked subs sound good in theory, but in reality I’d worry about possible phase cancellations when two independent subs are stacked vs one Gotham which is controlled with one integrated crossover etc.

Should I rearrange the four subwoofers?
 

True... hence my CR-1 recommendation. Also,
This is a direct quote from my discussions with Barry about dual subs and placement advice.

“Then again, someone with 2 subs has the options mentioned; you can put them in 2 good places; you can put them in 1 good place next to each other, (in which case they will sum 6 dB on paper and 5 dB in real life) or you can put them in 1 good place, one on top of the other; this is the magic of the JL F212 and Gotham G213. The 2nd driver is far enough off the floor to have different modal coupling to the room. The lower driver will play the planets-blowing-up LFE noises (say, 20-50 Hz) better into the room, while the driver that's 15-18" higher will play the 30-90 MUSICAL bass better into your chest and stomach; this is where the bass focus and slam comes from.

It is this higher freq area that when matched up with the mains at close to the XO region must be timed correctly to give you the desired sharp impulse response. If XO at 90, all we really care about is 85-95.

Further away from the XO freq the sub's phase shifts farther, but we don't care about that since it won't cancel because the levels are too different. With a 24 dB/octave XO every musical note is 2 dB different.

So that shows you your initial options with 2 subs.”

In my Florida HT... I run 4 Subs in the front, and 2 Gotham’s in the rear.

Marvelous!

WOW! Super awesome.

That same theater has 24 x 12” Woofers. :music:

There is a side wall with no subs. So there might be a good location somewhere along that wall to be found using the crawling method. Also possibly behind the seats. Pictures of the whole room can help.

Gotta ask, why 2 TVs?

My guess would be sports...

LOL :icon_jump::icon_jump:

Ivan,

That is awesome!

Question- if you only had the 4 in front (and didn’t have the Gotham’s) wouldn’t you redistribute the subs and have 2 up front and 2 in back (as opposed to just 4 up front)?

My experience with JL subs is short but this is what I suggest:
Get 2 or more thick comforters and spread them on the floor in front of your speakers & subs. See how that sounds. I do not know what sonic accessories you have? Bass Tubes? Carpets? If none, then those bare walls and wood floor will echo. Try the comforters or a large area rug and see the difference that makes. I don't see anything hanging on the walls, but the comforter trick is a quick and easy way to test what sound deadening will do.

Get the Subwoofer setup disk from Soundoctor.com.
http://www.soundoctor.com/

Read: http://www.soundoctor.com/whitepapers/index.htm

Call Randy Weaver at JL Audio tech support. Just call the main number, hit tech support prompt and he usually answers. He will spend a long time setting up the subs properly and answer any questions on placement. But first get the disk from soundoctor.

GET A CR-1 IS A MUST- as soon as you can
YMMV
Fred

Yes, I would have 2 in the front and 2 in the back; if I only were using 4 total.

I often watch my office security cameras on the top TV. But usually I watch a UHD disc and play the Nintendo Switch on them. No sports other than MMA.

What speakers and what subs are in that amazing theater Ivan?

Not to hijack this thread, but is this statement generally true for most set-ups? Was reading this/similar threads for general sub info to add small/fill lower frequencies to my 2 channel system (31 Hz - 24k Hz -3db towers) , wanted to pickup 15/20 -35+ Hz instead of getting bigger towers. Wondering if a single sub would be enough or possibly 2 stacked would fill better based on above statement

Reach out to Barry the "sound doctor" He is very knowledgeable & passionate about anything to do with subs. If your pocket allows he even does house calls.

I bet that room just rumbles!