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Old 18th July 2011, 02:00 PM   #41
Dr_EM is offline Dr_EM  United Kingdom
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The Behringer DXC2496 is only 215 at Digital Village if stock is not expected at CPC anytime soon.

Behringer DCX2496 Loudspeaker Management System | DV247

Is the Cubo design really going to play lower than ported though? A small path length horn doesn't seem like the right solution for low bass.

If you can afford the obscene enclosure volumes they require (around 300L per driver!) the Eminence Kilomax 18 drivers play very well to 30Hz ported. Not many pro 18" drivers get much below 40Hz. The Kilomax does but it has reduced max SPL from 40-60Hz, which isn't desirable, but if you have 4 I think you'll have the overhead to negate the issue.
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Old 18th July 2011, 02:10 PM   #42
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Thanks guys for all your comments but it looks like i've been offered 6x 18" reflex subs (based on the b&c desgin) for 2300 !! : )

Fingers crossed
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Old 18th July 2011, 05:47 PM   #43
epa is offline epa  Netherlands
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oops nvm
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Old 18th July 2011, 06:34 PM   #44
Xoc1 is offline Xoc1  United Kingdom
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Quote:
Originally Posted by Dr.EM View Post
Is the Cubo design really going to play lower than ported though? A small path length horn doesn't seem like the right solution for low bass.

If you can afford the obscene enclosure volumes they require (around 300L per driver!) the Eminence Kilomax 18 drivers play very well to 30Hz ported. Not many pro 18" drivers get much below 40Hz. The Kilomax does but it has reduced max SPL from 40-60Hz, which isn't desirable, but if you have 4 I think you'll have the overhead to negate the issue.
I must admit that I am quite enthusiastic about the Cubo Sub as I helped out with drawing it up
It has been built and tested independently by quite a few people now and has been well received.
I took the dims for the Cubo Sub and used them to create an Akbak sim
The comparison is a 300litre reflex tuned to 30hz - Same size as the Cubo Sub
The driver is the Precision Devices PD1850

Akabak says the Cubo Sub is more efficient from about 34hz up.
I know which one I would choose
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File Type: jpg CubosubVReflex.jpg (237.0 KB, 687 views)
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Old 21st July 2011, 12:06 AM   #45
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Quote:
Originally Posted by Xoc1 View Post
I must admit that I am quite enthusiastic about the Cubo Sub as I helped out with drawing it up
It has been built and tested independently by quite a few people now and has been well received.
I took the dims for the Cubo Sub and used them to create an Akbak sim
The comparison is a 300litre reflex tuned to 30hz - Same size as the Cubo Sub
The driver is the Precision Devices PD1850

Akabak says the Cubo Sub is more efficient from about 34hz up.
I know which one I would choose
To compare efficiency "apples to apples" you would need to raise the tuning of the 300litre reflex to match the higher F3 of the Cubo Sub.

A reflex box with a matching F3 to the Cubo Sub may not require as large of an enclosure for good performance, the 300litre reflex tuned to 30hz is a bit "droopy" above Fb.
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Old 22nd July 2011, 12:04 PM   #46
Xoc1 is offline Xoc1  United Kingdom
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I looked at this again and realised that I was not being fair as Dr EM had suggested the Eminence Kilomax Pro 18"
So I ran the sims again.
The Kilomax Pro 18" has a very good response in the 300litre 30Hz cabinet Dr EM suggested.
There is a problem with the driver excursion from 40 to 60hz as noted, as Xmax (10mm)is reached at about 40V@44hz - 200W/8R
The Cubo Sub PD1850 on the other hand is good for 80V - 800W/8R
Regards
Martin
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File Type: jpg CubosubPDVReflexKM.jpg (200.3 KB, 613 views)
File Type: jpg Disp CubosubPDVReflexKM.jpg (197.5 KB, 291 views)
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Old 22nd July 2011, 11:27 PM   #47
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Quote:
Originally Posted by Xoc1 View Post
I looked at this again and realised that I was not being fair as Dr EM had suggested the Eminence Kilomax Pro 18"
So I ran the sims again.
The Kilomax Pro 18" has a very good response in the 300litre 30Hz cabinet Dr EM suggested.
There is a problem with the driver excursion from 40 to 60hz as noted, as Xmax (10mm)is reached at about 40V@44hz - 200W/8R
The Cubo Sub PD1850 on the other hand is good for 80V - 800W/8R
Regards
Martin
Again, the ported box is tuned to about 28 Hz, the Cubo around 37 Hz.
Not apples to apples, FR needs to be matched to make valid comparisons.

Shrink the ported box, raise the tuning, it will increase in sensitivity and handle more power before reaching Xmax.

Cubo will still beat it by a bit, but when power compression is factored in, the difference may only be only a couple dB between the smaller BR compared to the Cubo.

Having heard the Eminence 4015LF sound clean in a BR and kind of fall apart at high power in a TH (though playing louder) the choices to me are not as clear as they seem in sim world.

Have fun,
Art
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Old 31st July 2011, 10:43 PM   #48
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Last sale idea didn't work guys.... the guys missed me around for days on end !!!
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