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18sound bandpass design
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smitske96 View Drop Down
Young Croc
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Joined: 16 February 2016
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Points: 1092 		Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 06 January 2019 at 1:31am
Anyone got more experience with this cab? I would prefer the dual 21 but I'm limited to 580mm hight..
Main question would be; why build this cab instead of a dual 18 BR with equal drivers.
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toastyghost View Drop Down
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Points: 10919 		Post Options Post Options   Thanks (0) Thanks(0)   Quote toastyghost Quote  Post ReplyReply Direct Link To This Post Posted: 06 January 2019 at 12:17pm
To answer your second question - because it's a shitload louder than a dual 18" reflex.
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smitske96 View Drop Down
Young Croc
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Points: 1092 		Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 06 January 2019 at 3:31pm
Originally posted by toastyghost toastyghost wrote:

To answer your second question - because it's a shitload louder than a dual 18" reflex.

Thats comforting LOL
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csijo View Drop Down
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Joined: 28 March 2005
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Points: 102 		Post Options Post Options   Thanks (0) Thanks(0)   Quote csijo Quote  Post ReplyReply Direct Link To This Post Posted: 06 January 2019 at 4:58pm
Originally posted by cookie-dj cookie-dj wrote:

RCF LF18G401 works OK in bandpass designs I think. if you want to be 100% sure, you will have to run it through hornresp Thumbs Up


Happy day friends of Speakers Plans 

I am writing to consult you the following:

I have the possibility to buy 4 used bass 18 18LW1400 of eighteen sound, to be used in
two Yamaha CW218 boxes with a aprox 460 liters, if I'm not mistaken. I wanted to know 
if the 18LW1400 could work efficiently in that box, wanted to know if they go well with 
that box and if they have a god perform there?

Thank you very much for your attention and support

Jose G. Ortega
csijo@hotmail.com
058-4128611357
Audio Fanatics, Bass lover
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ceharden View Drop Down
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Points: 11776 		Post Options Post Options   Thanks (0) Thanks(0)   Quote ceharden Quote  Post ReplyReply Direct Link To This Post Posted: 06 January 2019 at 8:17pm
Originally posted by csijo csijo wrote:

Originally posted by cookie-dj cookie-dj wrote:

RCF LF18G401 works OK in bandpass designs I think. if you want to be 100% sure, you will have to run it through hornresp Thumbs Up


Happy day friends of Speakers Plans 

I am writing to consult you the following:

I have the possibility to buy 4 used bass 18 18LW1400 of eighteen sound, to be used in
two Yamaha CW218 boxes with a aprox 460 liters, if I'm not mistaken. I wanted to know 
if the 18LW1400 could work efficiently in that box, wanted to know if they go well with 
that box and if they have a god perform there?

Thank you very much for your attention and support

Jose G. Ortega
csijo@hotmail.com
058-4128611357

Will probably work fine.  I like the 18LW1400 in reflex boxes and will be happy in a reasonable range of volumes.
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Pasi View Drop Down
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Joined: 25 April 2010
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Points: 2732 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Pasi Quote  Post ReplyReply Direct Link To This Post Posted: 06 January 2019 at 9:51pm
Originally posted by toastyghost toastyghost wrote:

To answer your second question - because it's a shitload louder than a dual 18" reflex.


Being a reflex cab, how is it louder than reflex cab?
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toastyghost View Drop Down
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Points: 10919 		Post Options Post Options   Thanks (0) Thanks(0)   Quote toastyghost Quote  Post ReplyReply Direct Link To This Post Posted: 06 January 2019 at 10:25pm
Originally posted by Pasi Pasi wrote:

Originally posted by toastyghost toastyghost wrote:

To answer your second question - because it's a shitload louder than a dual 18" reflex.


Being a reflex cab, how is it louder than reflex cab?


The thread title refers to the bandpass design? New page issues I guess, but the poster seemed to refer to that also
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smitske96 View Drop Down
Young Croc
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Points: 1092 		Post Options Post Options   Thanks (0) Thanks(0)   Quote smitske96 Quote  Post ReplyReply Direct Link To This Post Posted: 06 January 2019 at 11:02pm
That was my thought also. How does it benifit from such loading under 80 Hz.
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ceharden View Drop Down
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If you look at the impedance plot for the cab on the 18Sound datasheet, there is some bandpass effect going on.

I don't think you get a huge gain from this kind of arrangement but it will increase the air loading on the drivers and you probably do get a small increase in efficiency or more likely just an improvement of the coupling of the driver to the air in front of the cab.
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Pasi View Drop Down
Old Croc
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Joined: 25 April 2010
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Points: 2732 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Pasi Quote  Post ReplyReply Direct Link To This Post Posted: 07 January 2019 at 2:17pm
Originally posted by toastyghost toastyghost wrote:


The thread title refers to the bandpass design? New page issues I guess, but the poster seemed to refer to that also


It does, because 18sound themselves refer it to it as one. It doesn't have any real bandpass effects for it's intended operating range, and that little gain the slot gives is above 100hz, typically around 160Hz. Of course this reduces distortion on that area slightly and gives bit better loading for the drivers.

Main reason why they refer it as a bandpass is that above 160 it eventually due to slot will give slightly faster roll off than normal reflex. They give settings for 10th order bandpass, and those settings confirm with normal reflex at the bottom end and bandpassy at top end. But only slightly.
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Pasi View Drop Down
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Points: 2732 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Pasi Quote  Post ReplyReply Direct Link To This Post Posted: 07 January 2019 at 2:18pm
It's not like i haven't done boxes in this principle in the past ;)
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toastyghost View Drop Down
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Points: 10919 		Post Options Post Options   Thanks (0) Thanks(0)   Quote toastyghost Quote  Post ReplyReply Direct Link To This Post Posted: 07 January 2019 at 5:14pm
Fair fair, but I’ve heard various builds of these designs (with and without ‘tweaks’) and they’re all super impressive. Perhaps simply because of that steeper upper rolloff, making them feel more like a sub and allowing them to be driven harder, but the end result is the same!
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