sub trap
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Vinyl
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I used to have lingering bass frequencies in the 75/80 Hz regions in the audio section which is in the opposite side of the room – the two absorbers flanking the monitor plus a much denser 2’x3’ on the floor behind the HT rack which you don’t see are specifically aimed at curbing these frequencies – all this plus the combined absorbers/diffusers on the front wall of the audio section has resolved this slight audiophool annoyance – also tucked away for audio only is a little 10” sub set at 40Hz augmenting the Maggie’s which play at full range this has also contributed to the final results – the overall sound is now clearer and more detailed – acoustic panels are winners and recommended.The opposite end of the room may help to comprehend the full scope of the space and treatment.milpool said:
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Vinyl
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You may need to read some articles on the subject – below is a simple quote from GIK plenty more articles available from all sellers of such.Towen7 said:
“Is there something magical about corners? Yes, sort of. Low frequency pressure builds up wherever there is a boundary. Each room dimension has 2 boundaries which are generally parallel to each other. It's actually intuitive if you think about it. If you have pressure building along each wall and traveling to the outside ends, it stands to reason that it will pool in the corners since you're now where you're at 2 boundaries. When you place a panel at 45 degrees across a corner, you're getting the most 'bang for the buck"; you're producing the greatest attenuation using the least amount of space. This is because you're not only creating an air gap behind the absorber, but you're also at the ends of 2 or more of the room's dimensions. Efficient use of space is critical in small spaces where placement options can be limited."
Edit: Have you built any absorbers as of yet?
Vinyl
Active Member
Towen7 ... Sorry I might have misunderstood your ‘benefits curiosity’ statement – are you planning on building more floor/ceiling traps – or are you wondering whether they are worth the extra build? – regardless your reflection builds are all good – unfortunately in my experience it’s not until you complete the four chunked corners that one truly appreciates the impact they can make – I’ve also seen situations where just the two chunked front corners made a big difference.
The front right corner is the only one I can treat. The front left is flanked by a door and both back corners are flanked by cabinets. So yeah... My question is whether there is any benefit to treating the ceiling-to-wall corners when that corner is 45 degrees.
Vinyl
Active Member
I see now – you’re referring to a single absorber at the ceiling - similiar to photo.
If this is the case then you might want to play somewhat heavy bass content while taking readings with an SPL meter at the listening position - then move in on the proposed spot/corners with the meter still on - you may need to get up close to the ceiling for this – you should be able to see the difference in loudness on the meter – if the corner levels are ridiculously high compared to the sweet spot you have to decide if it’s worth a fix – if so use 6” thick or better and build as big as the area allows – I would build one as a trial run then measure see if it makes any difference – you may want to do this on all corners for they will all measure different – perhaps one or two at the loudest corners might be enough for you – this is a simple/crude method but it will give you some ideas as to how to proceed.
If this is the case then you might want to play somewhat heavy bass content while taking readings with an SPL meter at the listening position - then move in on the proposed spot/corners with the meter still on - you may need to get up close to the ceiling for this – you should be able to see the difference in loudness on the meter – if the corner levels are ridiculously high compared to the sweet spot you have to decide if it’s worth a fix – if so use 6” thick or better and build as big as the area allows – I would build one as a trial run then measure see if it makes any difference – you may want to do this on all corners for they will all measure different – perhaps one or two at the loudest corners might be enough for you – this is a simple/crude method but it will give you some ideas as to how to proceed.
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Towen7 said:I'm not being clear. My ceiling/wall joints are not 90 degrees, they are 45s. Is there any benefit to treating 45 degree corners?
Yes, you will benefit from treating the upper most corners where the ceiling meets the 45 degree wall.
Here's a pic from Ethan Winer.
Rope
90 degree or sharper corners are better for bass traps as the energy really multiplies in those corners. Even better is an open closet in the room with the door removed and filled with a bass absorbing material - known as a bass sump. A 135 degree corner (I assume that's what you mean by 45 degree corner) is better than a flat surface for absorbing bass in a room, but not as good as a 90 degree corner. However, any absorption is better than none.
Aaron German
Active Member
malsackj said:
Who needs family when you've got a good sound system? I think Mr. T needs to get his priorities straight. Audio first. And if there's any time left over when daddy's done listening, the girls get a turn to listen too.
:idea:
