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18" reflex sub ports

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stalian87 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote stalian87 Quote  Post ReplyReply Direct Link To This Post Posted: 23 August 2017 at 4:53pm
 

Edited by stalian87 - 23 August 2017 at 4:54pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hemisphere Quote  Post ReplyReply Direct Link To This Post Posted: 23 August 2017 at 5:03pm
The Faital drivers only seem to have more excursion because they use a very optimistic method to calculate it. 

If we use the Faital calculation on the BMS driver, then it has not 11, but 14.33mm xmax, which for a 12" driver is insane, and for the price is a bargain imo. Yes, the weight is high, but only 4kg more than the SW115 you were looking at, and the size and weight of the enclosure itself would be at least 10kg lighter.

If you could justify the amp power to get them moving close to their excursion capacity, a pair of them in a compact vented or sealed box would kick as hard as anything imo. A Behringer iNuke 6000 would probably do it.


Edited by Hemisphere - 23 August 2017 at 5:05pm
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stalian87 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote stalian87 Quote  Post ReplyReply Direct Link To This Post Posted: 23 August 2017 at 5:05pm
18 sound 18W750 could be a good bet...more sensitive that the BMS but slightly less xmax.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote stalian87 Quote  Post ReplyReply Direct Link To This Post Posted: 23 August 2017 at 5:08pm
sorry posting real close to each other lol

I'm not considering the faitals anymore...

amp power shouldn't be a prob...i'll get whatever i need to get the best performance!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote stalian87 Quote  Post ReplyReply Direct Link To This Post Posted: 23 August 2017 at 5:10pm
i've got the inuke 6000 already to drive 1 th18...gives me plenty of power although i would like slightly more..got a crown XTI4002 for the other th18 but i'm thinking of upgrading to 2 PKN XE6000's instead for the TH18s
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gen0me Quote  Post ReplyReply Direct Link To This Post Posted: 23 August 2017 at 5:12pm
18N862 should be great for br. Has potential for tapped horn but you need a right design. 18LW2400 has a bit stronger motor.
As classic br kicks choose speaker with low mms, medium qes. They are not expensive. Like
https://www.bluearan.co.uk/index.php?id=BMA15MI100
Or
https://www.bluearan.co.uk/index.php?id=FTP15PR400AP
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Post Options Post Options   Thanks (0) Thanks(0)   Quote cookie-dj Quote  Post ReplyReply Direct Link To This Post Posted: 23 August 2017 at 5:16pm
Originally posted by gen0me gen0me wrote:

18N862 should be great for br. Has potential for tapped horn but you need a right design. 18LW2400 has a bit stronger motor.
As classic br kicks choose speaker with low mms, medium qes. They are not expensive. Like
https://www.bluearan.co.uk/index.php?id=BMA15MI100
Or
https://www.bluearan.co.uk/index.php?id=FTP15PR400AP
he wants 12" though
You can't polish a turd!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hemisphere Quote  Post ReplyReply Direct Link To This Post Posted: 23 August 2017 at 5:16pm
They're 1dB more efficient than the BMS at 75Hz, and their efficiency is the same at 60Hz (in a 60 litre enclosure). A few quid more expensive, a few hundred  grams heavier. Their response models less flat as well - it rises faster than the BMS, so while they're equal at 60Hz, by 125Hz the 18Sound is 2.5dB louder (the BMS is about 2.5dB louder at 125Hz, but the 18Sound is 5dB louder, so for sealed it's no good)

If you use a vented arrangement you can use that  to your advantage to get about 2dB extra efficiency overall, but you would need a larger box as well.

So for vented the 18sound is probably better, for sealed the BMS.

It's that huge xmax that makes the BMS really interesting for sealed though. Vented is often favoured for kick for the simple fact that you can get the full volume displacement of the front and the rear of the cone, so if the driver in a vented box has 7mm of xmax, you could say it's like 14mm equivalent of air movement in a sealed box.

But this driver actually has 14mm of xmax, and you can get it moving that far with a strong amplifier without overpowering the output of your TH18. (both drivers will move the full 14.33mm at 65Hz with 3000w input between them), with an output of 125-128.5dB from 69-125Hz.


Edited by Hemisphere - 23 August 2017 at 5:28pm
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stalian87 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote stalian87 Quote  Post ReplyReply Direct Link To This Post Posted: 23 August 2017 at 5:24pm
good info man thank you! what you using to model drivers?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hemisphere Quote  Post ReplyReply Direct Link To This Post Posted: 23 August 2017 at 5:25pm
WinISD
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Post Options Post Options   Thanks (0) Thanks(0)   Quote gen0me Quote  Post ReplyReply Direct Link To This Post Posted: 23 August 2017 at 5:31pm
Those 12" bms drivers are much more sub drivers than kicks. You could fit them in some horn though.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Hemisphere Quote  Post ReplyReply Direct Link To This Post Posted: 23 August 2017 at 5:36pm
Why do you think it would be unsuitable as a kick driver?

Very low distortion, light carbon fibre cone, 3" voice coil. Seems like it should be fast and punchy. It says 'optimal for compact subwoofers' but I don't think that's intended as a limitation. (it is also called a 'bass midrange speaker')

The lower sensitivity makes it less suitable than the Eighteensound driver in a vented box, but in a sealed box it seems to tick all the, er.. boxes.

Edit: I guess the mms is not that low, but it has the motor strength to back it up. It's definitely not a traditional option, and there are faster drivers, but if you wanted something that hits hard like a bandpass horn or straight horn, without actually using a horn enclosure, this sort of driver in a sealed box would do well I think.


Edited by Hemisphere - 23 August 2017 at 5:50pm
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