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Cubo 15 |
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Robbo 
Old Croc 
Joined: 05 December 2005 Location: Shropshire Status: Offline Points: 4226 |
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 Posted: 24 February 2010 at 3:18pm |
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As usual, there is a screw up on the width of the cabinet yet again----Why can't anyone put a little thought into designing cabinets that are 580 mm wide like all the major names that make touring class cabinets do.
You can fit three 580 mm wide cabinets across most panel vans and they also pack so much better into larger trucks as well-----As soon as you design a cabinet that is 600 mm to 620 mm wide then you can only fit two of them across the width of your van---Lets face it, most cabinet designs that hold 12", !5", !8", and 21" drivers do not need to be wider than 580 mm---Just put a bit more thought into design as you can usually make size adjustments elsewhere in order to accomodate the 580 mm standard width.
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COZY PILLOW
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Joined: 23 February 2009 Location: SCOTLAND Status: Offline Points: 101 |
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Posted: 24 February 2010 at 3:40pm |
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on that thought if the cabinets were 580mm wide would the length or height be increased to compensate and which L or H would be the best way to achieve the same characteristics of the original sizes without affecting the response & tunning etc? |
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COZY
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mobiele eenheid
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Joined: 15 August 2004 Location: Netherlands Status: Offline Points: 1568 |
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Posted: 24 February 2010 at 6:35pm |
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There are very few 15" and 18" bass drivers that Cubo will not work with. according to simulations What driver to use would depend on availability and how much power is available. The Delta Pro 18 would be my personal choice if I had an amplifier between 500 and 900 W per cabinet. The PD 186 if I had an amp between 700 and 1250 W(+) per cabinet.
Best regards Johan
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COZY PILLOW
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Joined: 23 February 2009 Location: SCOTLAND Status: Offline Points: 101 |
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Posted: 25 February 2010 at 9:26am |
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Thanks Johan. The amps are not an issue. I believe the Pd186 is a very good driver.
Regarding the dimensions. Could the actual height of the cabinet be 58cm so that it could be packed on it's side and the length and width could be 64.1 x 64.1. would this change the cab too much and cause problems with the sound and performance? or did you consider these points when you designed this cab?
I'm guessing the height would be a possible problem because of the postion of the driver there may not be enough room to fit driver in?
Kindest Regards,
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COZY
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mobiele eenheid
Old Croc
Joined: 15 August 2004 Location: Netherlands Status: Offline Points: 1568 |
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Posted: 27 February 2010 at 2:52pm |
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Regards Johan |
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GekoMusic94
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Joined: 03 February 2010 Location: Italy Status: Offline Points: 469 |
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Posted: 27 February 2010 at 6:42pm |
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Thanks mobiele
 !!!
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Drapetsoniths
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Joined: 19 March 2010 Location: Greece Status: Offline Points: 55 |
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Posted: 23 March 2010 at 7:09pm |
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Hi johan, You mentioned using 18 inch drivers in the cubo and thats what is refered in fsp forum.
(although the designer has mentioned adding 3 cm depth to fit driver)
How do you expect the cubo 15 to work in terms of sensitivity and max spl
with b&c 18ps100?(or another decent 18 inch driver)
Do you think it would still get beaten by 2 mth-30 's?
one 18 vs 2 12s at about the same volume.... Edited by Drapetsoniths - 23 March 2010 at 7:10pm |
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bitzo
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Joined: 20 November 2007 Location: Italy Status: Offline Points: 977 |
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Posted: 24 March 2010 at 2:22pm |
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better in what terms?
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Drapetsoniths
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Posted: 24 March 2010 at 3:06pm |
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Were you refering to me? I didnt understand the question..
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bitzo
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Posted: 24 March 2010 at 3:44pm |
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yup...I mean what is better for what? I mean spl, velocity, portability, diy friendly, sound colouration, etc...etc...
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Drapetsoniths
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Posted: 24 March 2010 at 4:19pm |
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Do you mean this question?It is clearly stated
If you mean this one:
the same terms apply
sensitivity and max spl are the issue (not ultra low extension<45hz)
I think the twelves win on portability but kind of lose at price(important) and lf(not very important).
Both designs seem very diy friendly
Edited by Drapetsoniths - 24 March 2010 at 4:22pm |
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mobiele eenheid
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Joined: 15 August 2004 Location: Netherlands Status: Offline Points: 1568 |
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Posted: 24 March 2010 at 11:58pm |
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It is always hard to compare a design with an other if you haven't heard both, especially if one is your own, even though I like to think I'm quite neutral. For that reason I'll show the Hornresp sim of a MTH-30 in 1,0 pi vs. Cubo 18 (Extended) in 2,0 pi. After that some talk will follow why you should choose Cubo anyway ;)
Both SPL's are based upon a voltage input, where the cone excursion around 65-67 Hz reaches Xmax (both calculated the same way). The MTH-30 with PD 12SB30 and Cubo 18 with the B&C 18PS100.
As you can see 2 x the MTH-30 gives the best "bang for cabinet volume". Using an other B&C driver (the 18NW100) would tip the scale in favour of Cubo 18, looking virtually identical to this one:
This last one is Cubo 18 loaded with the 18Sound 18LW2400, their newest ferrite driver. When you figure in power compression (which both B&C and PD do not state) I suspect the scale will be slightly tipped in the favour of the MTH-30 once again, as 2 x 3" VC are likely to have lower power compression then a single 4" VC. However that's why I display the 18LW2400 as it's possibly keeping it's advantage even when corrected for power compression (it's that low).
It should be noted that all my measurements showed that Cubo 15 and 18 drop ~10 Hz lower then HR predicts. As such I would aspect it to have higher SPLmax between 40 and 50 Hz then the MTH-30 (unless that one drops lower as well of course).
Best regards Johan
Edited by mobiele eenheid - 25 March 2010 at 12:08am |
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on that thought if the cabinets were 580mm wide would the length or height be increased to compensate and which L or H would be the best way to achieve the same characteristics of the original sizes without affecting the response & tunning etc?