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Old 1st March 2013, 05:23 PM   #1
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Default Dipole subwoofer for to be used in nearfield?

Hi,

I was asking if anyone had experience in using an H-baffled - or similar subwoofer in nearfield application?

I would like to add some bass to my current monitors (Genelec 8020) and I would buy the matching 7050B sub instantly, but I know it won't respond well to my less-than-ideal room acoustics..

Hence I got an idea of making a H-baffled 12" dipole sub. I was thinking of crossing it over at 150hz or 200hz with DSP.

I would place it on my desk, thus distance from the sub to listener would be 1 meter or less!

Please give your opinions of such setup. Worth trying or not. I'm only expecting output to 40hz, and have no need for high SPL's.
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Old 1st March 2013, 05:41 PM   #2
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See Dipole on axis

Basically in the near filed you are justlistening to the front or rear source when on axis. If you are at 90 egress off axis you won't have any basss. For near filed it's hard to be a monopole woofer.
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Old 1st March 2013, 06:29 PM   #3
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This is my desktop setup. goes down to 40Hz at 80db.
Sounds amazing!

Click the image to open in full size.

Click the image to open in full size.
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Old 1st March 2013, 06:33 PM   #4
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Quote:
Originally Posted by john k... View Post
See Dipole on axis
For near filed it's hard to be a monopole woofer.
It is hard to be a monopole woofer, I agree
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Old 1st March 2013, 06:52 PM   #5
ScottG is offline ScottG  United States
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Originally Posted by Melo theory View Post
It is hard to be a monopole woofer, I agree
You know I subconsciously seem to "edit-out" typos.. I read it as "hard to beat", then I read your post and did a double-take.
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Old 1st March 2013, 07:00 PM   #6
ScottG is offline ScottG  United States
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Originally Posted by hedphones View Post
Hi,

I was asking if anyone had experience in using an H-baffled - or similar subwoofer in nearfield application?

I would like to add some bass to my current monitors (Genelec 8020) and I would buy the matching 7050B sub instantly, but I know it won't respond well to my less-than-ideal room acoustics..

Hence I got an idea of making a H-baffled 12" dipole sub. I was thinking of crossing it over at 150hz or 200hz with DSP.

I would place it on my desk, thus distance from the sub to listener would be 1 meter or less!

Please give your opinions of such setup. Worth trying or not. I'm only expecting output to 40hz, and have no need for high SPL's.

A single sub that close or not doesn't really matter a lot.

Now *two* dipole subs in stereo (L & R) that close, depending on their placement/proximity relative to you can make a difference.

One of the nice things here is that no matter the design, you'll get a "boost" in sp at lower freq.s when less than 3 feet.

If it's not a stereo sub (ie. single sub with summed input), then I'd suggest a location immediately behind your seated position with a proper phase adjustment. It can be any sort of design you want. However a dipole sub like this can lead to lower pressure leakage into adjoining rooms, making it a "quieter" solution.
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Last edited by ScottG; 1st March 2013 at 07:03 PM.
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Old 1st March 2013, 07:00 PM   #7
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Quote:
Originally Posted by hedphones View Post
Hi,

I was asking if anyone had experience in using an H-baffled - or similar subwoofer in nearfield application?

I would like to add some bass to my current monitors (Genelec 8020) and I would buy the matching 7050B sub instantly, but I know it won't respond well to my less-than-ideal room acoustics..

Hence I got an idea of making a H-baffled 12" dipole sub. I was thinking of crossing it over at 150hz or 200hz with DSP.

I would place it on my desk, thus distance from the sub to listener would be 1 meter or less!

Please give your opinions of such setup. Worth trying or not. I'm only expecting output to 40hz, and have no need for high SPL's.
1m might be too far away, the room will probably already show its ugly face. It's better to place the sub as close as possible behind the head.

Please see Comparison of different near field and far field subwoofer configurations
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Old 1st March 2013, 07:05 PM   #8
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Yeah markus, you use a ripole behind the seating position, yes?
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Old 1st March 2013, 07:08 PM   #9
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Quote:
Originally Posted by ScottG View Post
You know I subconsciously seem to "edit-out" typos.. I read it as "hard to beat", then I read your post and did a double-take.
Haha! yeah, I edit out them as well, but john's post had a plethora of typos!
Maybe a little mouse ran across his keyboard
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Old 1st March 2013, 07:12 PM   #10
ScottG is offline ScottG  United States
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Originally Posted by Melo theory View Post
Haha! yeah, I edit out them as well, but john's post had a plethora of typos!
Maybe a little mouse ran across his keyboard
Ah, now I "see" what I'm doing.. I seem to "hit" the first typo, and then subconsciously auto correct after that. You're right - veritable "mine-field" of typos in that post.
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