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Playing around with setup

154.5.20.17

Posted on August 24, 2021 at 14:46:58
watts
Audiophile

Posts: 442
Location: B.C.
Joined: June 30, 2004



I mean, of course I am; I own Maggies! Perpetual tweaking.

But recently got myself a Umik.

Been a few years since I have replied on here too.... but still own my 3.6's and they will end up in my will. :)

Over the past few days I have read several hours of Limage setup notes and experiences.

In my current room of 19.5 x 10.5 x 7 no windows; just one door, I have been experimenting with long wall/short wall/limage.

Attached is a frequency sweep graph shot (var smoothing) of: (red line) basically a Cardas position on the long wall. There is a large desk on one end so not quite centered along the long wall, but nearest speaker is 5'5" from the side wall, and both 4'4" from front wall with seating position 1' from back wall.

versus: (blue line) Limage setup where speakers are parallel to and a distance of 40-44% from the front wall (still playing around with it), tweets in, and 6.5" from sidewalls. I sit as far back as possible, but that is where the L-shaped desk is, so probably about 3 feet from back wall. If wifey is working from home (like right now) :( then more like 7 feet.

No treatments, and all CD/DVD racks removed etc. Looking at the graph obviously the bass is more uniform and smoother with the Limage setup, of course the cavernous soundstage is enjoyed as well. And some tracks are quite bright, but that should be able to be tamed with some absorption.

My thoughts: The long wall setup has a boom at 45 hz, which a tuned basstrap could absorb, and there is a null at 140 hz but not as deep as the 75hz one with Limage setup. I do enjoy the intimate equilateral setup as well, but that situation does need some reverberation treatment as well, according to my ears. Not sure if treatment can remove nulls, or destructive interference? Anyone had success with this?

I have some treatments on the way, so trying to decide which setup to go with before fastening the panels to the walls, taking into consideration not overdoing it and killing the spaciousness of course. :)

what do you guys think?

Also I have graphs comparing bass responses vs. sidewall distances for Limage setup if someone is interested.....



 

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RE: Playing around with setup, posted on August 25, 2021 at 13:59:14
watts
Audiophile

Posts: 442
Location: B.C.
Joined: June 30, 2004



Well I'll post it anyway :)

Here is the difference between 6.5" (blue) and 12" distance to the sidewalls in a Limage setup in my room (speakers about 42% from front wall) My ears say the same thing; clearly more bass all the way from 30hz to 200 hz with the 6.5" distance, so as I find the bass a little thin compared to the nearfield setup, so that is where I have them.

 

RE: Playing around with setup, posted on August 25, 2021 at 17:23:47
MarcL
Audiophile

Posts: 337
Location: PA
Joined: February 26, 2019



It's great that you have the measurements, and I bet the imaging with the Limage is amazing. I have mine set up Rooze ... similar concept.

The big issue is that enormous peak and null! I had a similar issue in my room and it took 20+ bass traps and Dirac Live to level it out.


Agilist, Musician, Photographer, Audiophile
Magneplanar: 3.7, CC5, MC1, DWM; Outlaw: UltraX12, LFM-1C; Emotiva: XMC-1, PA-1; Nord: Nord One NC500DM; Outlaw: Model 7500; OPPO 205

 

RE: Playing around with setup, posted on August 25, 2021 at 17:52:16
watts
Audiophile

Posts: 442
Location: B.C.
Joined: June 30, 2004
25? Cheesus. What size room? I have made a few DIY bass traps, the "pro" ones probably absorb a little more efficiently, but heck if the DIY work and you don't mind the look, and save $$$ why not. Haven't experimented placing any in the room and remeasuring yet.

Looks like your traps reduced the null's at 70 and 250hz, or perhaps shifted them slightly; good to know, that's exactly what I was looking for :) That 200hz one actually became a bump! Interesting.

I see we have the same amp(s)

Thanks for the response.

 

RE: Playing around with setup, posted on August 26, 2021 at 06:00:36
MarcL
Audiophile

Posts: 337
Location: PA
Joined: February 26, 2019
My bass traps are 2x4ft fiberglass 4, 6 or 8 inches thick. Room-facing surfaces have heavy craft paper. All wrapped in speaker cloth. They're in all four corners and some hanging across the ceiling/wall. The "pro" ones aren't that much better below 100Hz, if at all. It's very hard to bring down that 40Hz and nearly impossible to bring up a deep null like the 60Hz. This was a progressive effort over a couple year period as I rearranged the room. I took measurement with each incremental step so I knew they did something.

What I learned was, it was worth doing but in the end I still needed digital room correction. I first used an Antimode 8033 for the subs, then PEQ filters in JRiver .. finally Dirac Live did the complete job.

Agilist, Musician, Photographer, Audiophile
Magneplanar: 3.7, CC5, MC1, DWM; Outlaw: UltraX12, LFM-1C; Emotiva: XMC-1, PA-1; Nord: Nord One NC500DM; Outlaw: Model 7500; OPPO 205

 

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