Post by Citroen on Mar 7, 2021 18:06:08 GMT 12
I've always had bass problems in my small room. But recently have managed to tame most of it with a bit of electronic EQ, speaker placement, wishful thinking...
Tried this as per Steve's advice. Sine waves actually sound very uniform over most of the bass range. Found a big null point at 50 Hz about 1.5 feet in front of my listening position but otherwise surprisingly the same all round.
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Post by michaelw on Mar 8, 2021 13:18:19 GMT 12
In my squarish room I'm getting bass bumps in the corners but uniformity at the listening seat. No electronic manipulations were invoked 
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Post by Owen Y on Mar 8, 2021 14:04:58 GMT 12
Most rooms (ie the boxes that we play music within) produce standing waves of some description. Firstly, a 2.4m ceiling height produces a 71Hz standing wave resonance (with harmonics at 142Hz, 284Hz, etc). As our rooms are generally between 3m & 6m in width/length, there will also exist standing wave resonances at between 57Hz to 28.5Hz. ie, right in the low bass regions. This WILL be happening to some degree - unless your room is non-rectangular. In the timber-framed homes, like most of us live in, the problem is worse, because the reflecting surfaces (walls & ceilings & floors) themselves will resonate & contribute (unlike concrete of masonry structures). The key question is, where do we place the listening seat & our loudspeakers in order to avoid or minimise the effects of these resonances? We generally sit mid-room - not the worst position but not good. But hopefully away from the rear wall (bass boost). Loudspeakers are generally recommended to be placed at an odd fraction of room dimension - ie. 1/3, 2/5, 1/5 etc across the room. And away from the front wall. Although there are exceptions, these are the usual 'rules of thumb' for most uniform LF response within a room space (a box).
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Post by michaelw on Mar 8, 2021 16:19:51 GMT 12
Harry Pearson's Rule of Thirds here
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Post by Citroen on Mar 8, 2021 16:46:10 GMT 12
Speakers about 1/3 into the room, but placed along the long wall rather than down the long wall (against recommendations but not practicalities). Equilateral triangle roughly. But seat hard against rear wall which maybe isn't ideal. 
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Post by Owen Y on Mar 8, 2021 20:26:04 GMT 12
Oh, and 3.3m or 3.6m ceilings in the older villas etc, have floor-ceiling resonance frequencies of ~50Hz (which may be subjectively welcome, but not smooth/uniform bass).
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Post by Owen Y on Mar 9, 2021 9:43:06 GMT 12
Citroen's space is nice sounding, helped no doubt by his big couch acting as a bass trap... And the clever vinyl mass-loaded 2-seater to the side.  The rug, of course, gets transferred over onto the TV screen, before any serious listening takes place 
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Post by michaelw on Mar 9, 2021 10:09:19 GMT 12
where's the mobile room treatment doggo
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Post by rmc001 on Mar 9, 2021 10:35:36 GMT 12
Citroen s space looks great. I darent post mine cuz of the filth and clutter lol 😂 but I value the fact that my room has a vinyl-on-concrete floor.
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Post by Citroen on Mar 9, 2021 11:37:29 GMT 12
where's the mobile room treatment doggo Sitting in the sweetspot 
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Post by michaelw on Mar 9, 2021 13:00:42 GMT 12
Golden ears
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Post by Citroen on Jun 27, 2021 16:19:59 GMT 12
Herbies Gliders under speakers, moving one leather seater from in front of the right speaker seems to have helped. Still not totally happy as some peaks still present but better than before! 
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Member
Post by james on Jun 28, 2021 21:07:48 GMT 12
My room has a mixture of peaks and troughs.
Sort of L shaped with 45 degree corners.
A little surprised to find lowering the speakers cured some of the nulls.
Typically faff about moving the speakers to minimise the nulls then use the GLM to flatten the peaks.
Although the room is corrected for the listening position the best sound is forward closer to the speakers (More direct sound and less room/wall reflections?)
Previous speakers were flat to 24/25hz - expect replacements to go a bit lower.
Borrowed the bedroom speakers which struggle to go much lower than 35 left 40 right.
Speaker position is critical - 2mm of movement will often alter the measurements considerably.
Typically run a 1.5/2 db slope on the top end (Takes the heat out of some recordings)
Once set up nothing will be changed for months on end - I want to enjoy music not spend hours altering the gear.
Trust your ears.
43 posts
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Post by RdM on Jun 30, 2021 21:58:55 GMT 12
Speakers about 1/3 into the room, but placed along the long wall rather than down the long wall (against recommendations but not practicalities). Equilateral triangle roughly. But seat hard against rear wall which maybe isn't ideal.
I think my room is a little bit similar. I too put my speakers against the long wall. Not a big room. It seemed the most logical arrangement. This from October 2016. The iMac was a friends that I'd just upgraded the ram on. The PC box & monitor just temporary. Now a laptop on it.
I'm looking back through old photos. The evolution of the room might be interesting. I put up two layers of curtains behind the speakers. Added diffusing bookshelves behind the couch, itself pulled a little bit 15cm out to allow picture frame storage behind.
More later perhaps.
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