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Old 1st May 2016, 02:22 PM   #1
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Default Small rooms under 150Hz, is there any solution.

Hello,
Is there any solution/trick for bedroom listenings under 150Hz please ?
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Old 1st May 2016, 02:54 PM   #2
Toaster is offline Toaster  United Kingdom
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Mini swarm-style distributed system with DSP?
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Old 1st May 2016, 03:13 PM   #3
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Quote:
Originally Posted by Toaster View Post
Mini swarm-style distributed system with DSP?
Could you tell what Mini swarm is please ?

Whatever loudspeakers that i've used (except a recent multiple dipolar desing), the room resonaces are the same, there are room cancellations and boosts.
The sound change from night to day at each position of the room.
My current setup has get rid of this problem but i'm tring to know if i've missing a good trick from the loudspeakers Yodas of diyaudio

Thx
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Old 1st May 2016, 03:52 PM   #4
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Quote:
Originally Posted by silverprout View Post
Could you tell what Mini swarm is please ?
An army of mini subwoofers everywhere... anyone has experimented ?
Very clever and interesting !
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Last edited by silverprout; 1st May 2016 at 03:53 PM. Reason: Sorry for my English
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Old 1st May 2016, 04:16 PM   #5
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Hi,
A number of people have reported success with the result. Harman and Gedlee have written papers on the techniques but I believe one must be able to eq to get an optimal result.

https://www.harman.com/sites/default...s/multsubs.pdf

Can't find the gedlee paper link right now but good luck!
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Old 1st May 2016, 04:19 PM   #6
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Also, some people have used nearfield bass with a delayed signal. I believe with nearfield the direct signal swamps out the modes and you don't get the peaks and dips in the listening position but it's been a while since I looked at the theory. Happy listening!
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Old 1st May 2016, 05:18 PM   #7
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Quote:
Originally Posted by mikealanlee View Post
Hi,
A number of people have reported success with the result. Harman and Gedlee have written papers on the techniques but I believe one must be able to eq to get an optimal result.

https://www.harman.com/sites/default...s/multsubs.pdf

Can't find the gedlee paper link right now but good luck!
4 subwoofers are enough !
Fantastic ! but these subwoofers needs a lot of headroom to be correctly equalized (more than two dozens of dB)

Quote:
Originally Posted by mikealanlee View Post
Also, some people have used nearfield bass with a delayed signal. I believe with nearfield the direct signal swamps out the modes and you don't get the peaks and dips in the listening position but it's been a while since I looked at the theory. Happy listening!
Too complex for me, i've tried to place four subs on a lot of positions... with simple equalizers.
The bruteforce dipolar infrasub near the center of the room give the best results witout extreme equalizations possibilities.

Thx.
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Last edited by silverprout; 1st May 2016 at 05:19 PM. Reason: Sorry for my english
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Old 4th May 2016, 04:19 PM   #8
waxx is offline waxx  Belgium
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with extensive bass trapping on the right frequencies you can do a lot to minimize room modes. But that requires some skills in acoustics and redesigning your room arround the acoustics (like they do in music studio's) so your room is death sounding.

Otherwise you will always have those kind of problems...
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Old 4th May 2016, 04:33 PM   #9
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James Romeyn has a simpler variation of the Harmon system - 3 or 4 bass drivers but really well distributed in the room first to get even bass - then add some dsp if required and refrain from the large boosts to limit power requirements to quite reasonable levels

There's a number of speakers developed to specifically fit small rooms like bedrooms, etc - a lot of the small sphere type speakers function quite well here like Gallo, etc
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Old 4th May 2016, 05:14 PM   #10
sreten is offline sreten  United Kingdom
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Hi,

Note that the harmon paper is not about getting the best overall response.
It is about getting the most consistent response that can then be corrected.
The two are not remotely the same thing, in terms of subwoofer placement.

rgds, sreten.
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