Cubo 18:
Cubo 18 is a multi purpose, stand alone bass bin that, like Cubo 15, will equal or out run a single 18" BR*, of similar size, from ~ 40 Hz and up in terms of sensitivity. Cubo 18 works with a wide variety of 18” drivers. It has a cut list from just over a single 18 mm*** sheet (244 x 122 cm) / (8' x 4') with a single angled cut. Cubo 18" realizes a cost effective, small and light weight enclosure following the KISS-principle.
Development:
In 2007 the first prototype was build and tested. Cubo 18" is the 5th prototype in a line of hybrids aiming at the achievements as stated above.  Cubo 18 Standard and Cubo 18 Extended will both work with a wide variety of drivers, if uncertain which one will be most suited, build Cubo 18 Extended or mail me at This email address is being protected from spambots. You need JavaScript enabled to view it.
Size: 62x62x65cm (HxWxD)    
Frequency: From 40 Hz up to 110 Hz    
Enclosure Type: Hybrid

3D Model (by K-M-Sound-System):

 
Footnotes: 18” drivers preferably with an EBP of 100 or higher; Fs (22-42 Hz), Qts (0.25 - 0.58), Vas (200 - 450 L) / (7.4 – 16.7 ft^3). Where EBP = Fs / Qts . Measurements will follow.
 
Cubo 18/15 (difference): Cubo 18 is 3 cm (/ 1 1/6th inch) deeper then Cubo 15. Due to phase similarities Cubo 18 and Cubo 15 can be  used together without noticeable issues. Cubo 18 has on average slightly more output for a given input in comparison with Cubo 15 (based upon electro-mechanical relatively similar drivers), especially between Fc high and Fc low,whilst Fc high and Fc low, remain similar (= cut-off frequency).
 
 
 
 Cubo 18: Front view
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Cubo 18: Side view without side panel
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Cubo 18: Driver for comparison
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Cubo 18: Detail magnet and bracing
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Cubo 18: Magnet facing out
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Cubo 18: Magnet in chamber
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Cubo15's Avatar
Cubo15 replied the topic: #24988 4 months 2 weeks ago
The 18 Sound 18NTLW5000 does not fit (under normal circumstances) in Cubo 18, mounted with the magnet in the horn, due to the driver depth. However some changes can be made to make it fit. It does fit mounted with the magnet in the chamber, with some minor changes.

It does work best in Cubo 18 Extended, if you need help with making changes so it fits, send me an e-mail at: questionsaboutcubo at gmail dot com

Cubo
Trizzor's Avatar
Trizzor replied the topic: #24984 4 months 2 weeks ago
Hello, have anyone Test the 18 Sound 18NTLW5000 in die Cubo 18? Or can say if the ntlw will work in the Cubo 18?

Thx
dave305's Avatar
dave305 replied the topic: #24939 9 months 3 weeks ago
Thank you very much, I`ll send you pics and keep you posted
Cubo15's Avatar
Cubo15 replied the topic: #24938 9 months 3 weeks ago
@Dave305: From that list I would choose the FTR18-4080FD, it's a good driver for Cubo 18 Extended. I think you also e-mailed me that you wanted 30 Hz performance, in which case you're better off using Cubo Sub. However the FTR18-4080FD might be on the light side for all day 30 Hz performance (couldn't find Xmech though).

@Jack: The 18NLW9400 is the 18Sound equivalent of the B&C 18NW100, both rated at 1200 W AES, it would be my choice with an amplifier of roughly 1200 W or less. The 18TLW3000 is a very high power driver, with the 4 Ohm version looking best (better than the 8 Ohm version), it's a good choice if you have around 1800 W or more to power it with.

Cubo
jack.bergquist23's Avatar
jack.bergquist23 replied the topic: #24937 9 months 3 weeks ago
Hi All,

So after faffing around for too long I missed the boat on the 18nw100 availability and they're now on back order for at least 80 days from one of the few places that ship to NZ :-S I'd heard some positive things about the 18TLW3000 en.toutlehautparleur.com/18-sound-18tlw3...r-4-ohm-18-inch.html but it EBP (as you've defined Fs/Qts) is only 91hz. Is this going to make it a non-starter? Very open to other suggestions - am trying to balance getting something that will work well in the Cubo 18's (which I have the wood cut and ready for) and be ported into one of the paraflex designs once the price of timber goes back down in NZ (3 sheets per box at $280nzd a shot is a bit nuts!)
dave305's Avatar
dave305 replied the topic: #24936 9 months 3 weeks ago
Hello, MR.Cubo
Trying to build the cubo18 not sure which of the two I should build
the drivers in my price range and in stock are

JBL. 18SWS1000

SWLENIUM 18SWS1000

CELESTION FTR18-4080FD

EMINENCE KAPA PRO

CELESTIOR. CF1830E
Maikolmks's Avatar
Maikolmks replied the topic: #24926 11 months 10 hours ago
thank you very much Mr. CUBO. anyway I was wrong to write. I have the 18NLW9400, so it will work fine inside
Cubo15's Avatar
Cubo15 replied the topic: #24925 11 months 11 hours ago

The 18NLW2400 is an 18 inch extended low frequency loudspeaker designed for high SPL subwoofer applications in either a reflex, bandpass or horn loaded configuration. Compared to our industry standard 18LW1400, the 18LW9400 provides higher maximum SPL, increased program power handling and lower power compression. In order to furtherly increase power handling and reduce power compression figure, 18NLW9400 uses the same voice coil ventilation technology developed for our flagship 9000 neodymium transducer series. 

Apparently, they couldn't choose it's final name then. Now it's known as the 18NLW9400 ;)

Both the Ciare Cw455 and the 18NLW9400 will work best in Cubo 18 Extended.

Best regards Cubo

Maikolmks's Avatar
Maikolmks replied the topic: #24923 11 months 6 days ago
hello Mr. CUBO, I have recently purchased an 18NLW2400, would it work better in the standard or extended version?
Cubo15's Avatar
Cubo15 replied the topic: #24914 11 months 2 weeks ago
Hi Nugget,

Those are looking great! All measurement data is welcome.

Cubo
Nugget's Avatar
Nugget replied the topic: #24912 11 months 3 weeks ago
Hey Cubo after you helped me and everyone else here so much, i thought you might be happy about some building Pics. I built 4 Cubo 18 extended in February and also did some measurements, which i uploaded as pictures too. If you're interested in the measurement data for group delay, distortion, etc. just tell me and i will send them to you.

Here's the link: www.audiofotos.eu/album/cubo-18-extended.mxi
Cubo15's Avatar
Cubo15 replied the topic: #24895 1 year 1 month ago
The Dayton Audio PN470-8 works best in Cubo 18 Extended, because Xmax is limited a 35 - 40 Hz high pass is advisable.

Cubo
lawbadman's Avatar
lawbadman replied the topic: #24894 1 year 1 month ago
Hello,
Would the Dayton Audio PN470-8 18" NEO work well in the Cubo 18 or the Cubo 18 extended?

www.parts-express.com/Dayton-Audio-PN470...e-Coil-8-Ohm-295-046
lawbadman's Avatar
lawbadman replied the topic: #24893 1 year 1 month ago
Hello,
Would the Dayton Audio PN470-8 18" NEO work well in the Cubo 18 or the Cubo 18 extended?

www.parts-express.com/Dayton-Audio-PN470...e-Coil-8-Ohm-295-046
Cubo15's Avatar
Cubo15 replied the topic: #24891 1 year 1 month ago
Hi Jack,

The parameter based selection advice for standard or extended is the same as for Cubo 15, so Cubo 18 Extended in the case of the 18NW100-4. I once build a Cubo 18 Extra Extended but found Cubo 18 Extended worked just as well.

Cubo
 
jack.bergquist23's Avatar
jack.bergquist23 replied the topic: #24888 1 year 1 month ago
Hi Cubo et all

Looking to make a pair of Cubo 18s using B&C 18nw100-4's en.toutlehautparleur.com/speaker-b-c-spe...0-4-ohm-18-inch.html

I believe they do meet all of the requirements outlined in the spec advise above. What I'm keen to know if whether the parameter advice when selecting standard or extended are the same as for the Cubo 15? As such if Vas * Qts for this driver comes in at 54.95 then the extended box should be used?

Cheers

jack
Cubo15's Avatar
Cubo15 replied the topic: #24822 1 year 5 months ago
Hi,

It wouldn't be my first choice to use the 2225H in Cubo Kick 18 but it can be done, it's Xmax is on the small side for Cubo 15 so Cubo 18 is abetter choice. If the 3 cm depth difference is that important you could add 3 cm to the front of Cubo Kick 15. Alternatively you could also use the 2240H in Cubo Kick 18.

Both 18's drivers are suited for Cubo 18 Extended. The 2242H will take the most power as it has plenty of Xmax, for the 2240H I would use a 40 Hz high pass and around 500 W of amplifier power as it's Xmax is somewhat limited.

Best regards Cubo
Andrew4566's Avatar
Andrew4566 replied the topic: #24821 1 year 5 months ago
I am considering building a pair of either Cubo 15 or 18 and a corresponding pair of Cubo Kicks.

I own a number of three different JBL drivers and would like to utilize them if I can.

2225H/J 15"

FS: 40hz
QTS: .28
VAS: 170l

2240H 18"

FS: 30hz
QTS: .23
VAS: 489l

2242H 18"
FS: 35
QTS: .28
VAS: 283l

If the best solution is a Cubo 18... can a Cubo Kick 18 be used with the 2225 15" driver so that is matches size wise?

-Andy
Cubo15's Avatar
Cubo15 replied the topic: #24814 1 year 6 months ago
Is there a high pass filter set, if so at what frequency and how steep?

Typically the Kilomax will have more excursion in Cubo Sub than Cubo 18.
marco 101's Avatar
marco 101 replied the topic: #24813 1 year 6 months ago
the dimensions of my BR-box are almost equal to the cubo 18. Yes idd there is a crossover between and another processor that I can pretty much get away with. only found that I quickly reached the x-max of the kilomax in the BR.
think i was on 700rms.
Cubo15's Avatar
Cubo15 replied the topic: #24812 1 year 6 months ago
The Eminence kilomax is well suited for a reflex design, your cabinet doesn't seem extraordinarily large so excursion shouldn't be a problem, do you know the internal volume and tuning frequency? Also do you use a high pass filter to protect against over-excursion, if not that's where I would start.
Cubo 18 Standard will limit excursion compared to a reflex cabinet but will require a high pass to limit excursion below it's tuning frequency just like a reflex does.

Best regards Cubo
marco 101's Avatar
marco 101 replied the topic: #24811 1 year 7 months ago
So this disign is the best for the Eminence kilomax ? a have them in BR -design , nut the X-Max is to fast
Cubo15's Avatar
Cubo15 replied the topic: #24731 1 year 10 months ago
That is good to hear. Either listen to the standard setup or test in a practical setting with the method described above. Both the port of the reflex top and Cubo introduce a frequency dependent delay, if you're lucky those are the same at the crossover frequency of your choice and you won't need delay.

Best regards Cubo
ushakov1957's Avatar
ushakov1957 replied the topic: #24730 1 year 10 months ago
Good afternoon. Thanks for the detailed and detailed answer (I have an audio delay adjustment in the tops)! If the tops and the subwoofer are at the same distance from the listener and the speaker in the subwoofer is magnetically inserted in, then is there no need for a sound delay in the tops? Thank you
Cubo15's Avatar
Cubo15 replied the topic: #24729 1 year 10 months ago
I'm not sure if the Yahama has delay settings, if it has you're adjusting 33 cm of sound path difference for every millisecond of delay that you apply. Sound path differences depend on the exact design of the subs and tops but also spatial placement. The easiest way to set up delay is to play a sine wave, of the crossover frequency that you use, through your top and sub simultaneously. (in your case 70 or 100 Hz). This doesn't need to be played loud by the way.. If you reverse the polarity on the driver or switch the phase setting on your sub amp, the best delay is the setting that reduces output to a minimum. Meaning that if you use the normal polarity during use, the sub and top will have maximum output at the crossover frequency.

Placing the amplifier horizontally on the back wall of the subwoofer at the very bottom is the easiest solution, you might want to cover the electronics from the inside with some ply. You could also place the amplifier vertically but I would need stricter dimensions of the amplifier (including depth), as it will no doubt complicate things.

Best regards Cubo