4 CBe-18s or 6 SS15s - Page 2

scameron78 · 21st December 2011, 11:25 AM

i did find this statement:

"Shouldn't be too hard to work out - Stipe has said in another thread that the CBX is the same as the CBe except the width has been increased to 1152 - so increase the width of top, bottom, baffle & panel B by 100mm, and increase panels E by 50mm."

scameron78 · 21st December 2011, 11:49 AM

more info on the standard CB-18

stapiers cb-18 - Speakerplans.com Forums

scameron78 · 21st December 2011, 02:47 PM

CBe-18 PLANS

Djim · 21st December 2011, 10:45 PM

That last sketch was helpful since it is bigger than the one I had. I corrected the lengths and also corrected the volume of the front chamber that was way of. The results so far; the CBe-18 has a 1/4WL of 37Hz and a 1/3WL of 49Hz. It would be nice to see some real measurements including some impedance plots...

scameron78 · 21st December 2011, 11:43 PM

there is some measuring on this page. not sure if this helps.

Djyves Projects CB(X)-18's, TH-SPUD, Duran tops... - Speakerplans.com Forums - Page 7

Djim · 12:57 AM

It does deliver an interesting view if you compare it with JBell's measurement of the SS15. A few things should be considered; JBell measured outside and the CB-18 is measured inside (not against a wall), no idea about differences in equipment although both use a low cut filter.. The CB-18 uses an 120Hz high cut filter. Of course the overlap is no more than an indication.

Edit: the dip at 48Hz of the CB-18 is probably caused by room acoustics.

Djim · 22nd December 2011, 10:58 PM

I did get a question about the last grapgh. You can't use it to compare decibels since both measurements used a different dB scale! While the CB18 is measured in steps of 20 dB (main horizontal lines) the SS15 is measured in 12dB. You can only use it as an identification for the similarity in resonance points of the tapped horns/pipes as the horizontal frequency line is linear between the two. So the only conclusion from this graph is that the Cyclops CB-18 has similar resonance points and therefore is designed with similar 1/4WL, similar path length. I made a new one with both dB setting in the same colour as the cab they represent to prevent wrong assumptions.

Green represents the CB18
Red represents the SS15

22nd December 2011, 12:49 AM	#16
Djim diyAudio Member Join Date: Dec 2009 Location: 'Ollanda	It does deliver an interesting view if you compare it with JBell's measurement of the SS15. A few things should be considered; JBell measured outside and the CB-18 is measured inside (not against a wall), no idea about differences in equipment although both use a low cut filter.. The CB-18 uses an 120Hz high cut filter. Of course the overlap is no more than an indication. Edit: the dip at 48Hz of the CB-18 is probably caused by room acoustics. Last edited by Djim; 22nd December 2011 at 12:57 AM.

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21st December 2011, 11:25 AM	#11
scameron78 diyAudio Member Join Date: Mar 2011	i did find this statement: "Shouldn't be too hard to work out - Stipe has said in another thread that the CBX is the same as the CBe except the width has been increased to 1152 - so increase the width of top, bottom, baffle & panel B by 100mm, and increase panels E by 50mm."

21st December 2011, 11:49 AM	#12
scameron78 diyAudio Member Join Date: Mar 2011	more info on the standard CB-18 stapiers cb-18 - Speakerplans.com Forums

21st December 2011, 10:45 PM	#14
Djim diyAudio Member Join Date: Dec 2009 Location: 'Ollanda	That last sketch was helpful since it is bigger than the one I had. I corrected the lengths and also corrected the volume of the front chamber that was way of. The results so far; the CBe-18 has a 1/4WL of 37Hz and a 1/3WL of 49Hz. It would be nice to see some real measurements including some impedance plots...

21st December 2011, 11:43 PM	#15
scameron78 diyAudio Member Join Date: Mar 2011	there is some measuring on this page. not sure if this helps. Djyves Projects CB(X)-18's, TH-SPUD, Duran tops... - Speakerplans.com Forums - Page 7

22nd December 2011, 10:58 PM	#17
Djim diyAudio Member Join Date: Dec 2009 Location: 'Ollanda	I did get a question about the last grapgh. You can't use it to compare decibels since both measurements used a different dB scale! While the CB18 is measured in steps of 20 dB (main horizontal lines) the SS15 is measured in 12dB. You can only use it as an identification for the similarity in resonance points of the tapped horns/pipes as the horizontal frequency line is linear between the two. So the only conclusion from this graph is that the Cyclops CB-18 has similar resonance points and therefore is designed with similar 1/4WL, similar path length. I made a new one with both dB setting in the same colour as the cab they represent to prevent wrong assumptions. Green represents the CB18 Red represents the SS15

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