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Old 21st September 2012, 06:20 AM   #181
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Should I buy another two for the OB to turn around and even out the even harmonics? (ok I'm only just teasing you now )

I don't actually even like the look of them I just bought them because you told me to... Might see If I can paint them black.

Will see how I go with these two, and look at buying another two for subs once I see how they perform. If they are too much for woofers, I will just use these ones in the subs.

Have to wait and see now how much the tax man is going to slug me once they get here.

Last edited by Silent Screamer; 21st September 2012 at 06:30 AM.
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Old 21st September 2012, 06:56 AM   #182
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Originally Posted by studiotech View Post
EDIT: Just noticed the Mms, 425g! Ouch, if you believe that this makes a difference. For comparison, my B&C is 96g, but much less xmax and higher FS.
You will never get down to 19 Hz anyway with OB (unless you have a very large room. Maybe in a stuffed u-frame?

I would rather swap the 19 Hz to some efficiency instead.
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Old 21st September 2012, 07:24 AM   #183
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Originally Posted by Kjeldsen View Post
You will never get down to 19 Hz anyway with OB (unless you have a very large room. Maybe in a stuffed u-frame?

I would rather swap the 19 Hz to some efficiency instead.
About an hour ago I decided to take a different direction and just purchased a pair of these TC Sounds Pro 5100 18" Neo Subwoofer Driver 293-674

Not sure that the mms will be very low on those either, as the sandwich cone is made up of several layers of materials. "The highest power underhung radial Neodymium motor ever made is coupled with an acrylic foam fiberglass sandwich cone"

Greg rather than buy another set of the 5100 would I be better getting these for the OB? http://tcsounds.com/product/drivers/lms-ultra-5400/

Last edited by Silent Screamer; 21st September 2012 at 07:27 AM.
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Old 21st September 2012, 08:36 AM   #184
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Originally Posted by hajj View Post
The smaller the radius(less than a couple of centimeters in the case of the shopping center bends), the less obvious is the distortion.
On a 20cm radius bend, unless you have specialty industrial grade equipment, getting it to look good will be quite a challenge.
The bendy MDF might be the best was to go.

P.S: have you thought about the acrylic's resonance? I have no idea what the intrinsic resonance frequency of such a tube would be, but it's a good idea to check it out first.
Thanks for this info, I will need to look further into it.
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Old 21st September 2012, 10:28 AM   #185
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Quote:
Originally Posted by Kjeldsen View Post
You will never get down to 19 Hz anyway with OB (unless you have a very large room. Maybe in a stuffed u-frame?

I would rather swap the 19 Hz to some efficiency instead.
I managed to do it.
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Old 21st September 2012, 11:50 AM   #186
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I managed to do it.
Appreciate any advice you can offer in getting this low, since you seem to be one of the few people that have attempted to do the full range with OB.
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Old 21st September 2012, 11:59 AM   #187
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1. Cone area. A single 15" will not do... I have sixteen 21" woofers.
2. Baffle size, the larger the better. But a large baffle lowers the upper frequency limit. I have H-baffles 600x600x1200 mm, with two 21" in each baffle. And there are eight such baffles.
3. Placement in the room. You must place the baffles close to the walls to avoid "driving" the standing wave modes as much as possible, otherwise you will get deeps nulls in the frequency response. Although dipoles don't "couple" to the room like monopoles, they do behave best at low freqencies when close to the walls.
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Old 21st September 2012, 12:17 PM   #188
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A photo does it better
Click the image to open in full size.
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Old 21st September 2012, 12:30 PM   #189
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Damn that's crazy!

I've got 2 x 18" coming, and could easily buy another two, but then space is going to fill up pretty quick. Is 4 x 18's enough to get decent low bass?
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Old 21st September 2012, 12:32 PM   #190
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This is what it takes to get clean 20 Hz from dipoles....
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