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kiriiz 
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Joined: 09 January 2009 Status: Offline Points: 70 |
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 Posted: 12 April 2009 at 4:09am |
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Very interesting. What about spl measurements? This cab needs very very high power, is it justified? :)
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roborg
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Joined: 05 July 2004 Location: United Kingdom Status: Offline Points: 1026 |
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Posted: 13 April 2009 at 12:32am |
so far they've only been run in pairs indoors with little experimentation time. The first time i used them in a pair at 90degrees to each other they performed a bass-walk over about an hour & pivoted around until the fronts were level (maybe they auto-adjust for optimal output
 ) When i get the system outdoors & fix all the little niggles (which are actually all show-stoppers!) i'll make an honest attempt at quantifying things. My suspicion is that, with music, there will be little audible effect from 90-180degress. It'll be interesting to find the best angles for hifi or low output.
Overall I'm totally satisified with the sub-bass reproduction indoors. Two together seem to deliver everything thats needed for low extention, but they still sound capable up to 150hz (i need to do some A/B comparisons to make any real claims) I've yet to run them really hard too, in which case kick is going to be modulated quite a bit by the low output. I want these boxes to be really good for the first 2 octaves, i dont want to have to convince myself of this!
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What I cannot create, I do not understand
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roborg
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Posted: 13 April 2009 at 1:14am |
It's unlikely i'll attempt a precise spl measurement, i dont have the equipment for a measurement to be comparitively useful (also if it was suprisingly good, no one would believe me
 ) For me the actual spl value is not important, i just know i want a big hornloaded bass section! The design is justified in terms of its intended role: i wanted a system with about 15-25Kw hornloaded bass that could fit entirely in a single van & weigh less than 1000Kg with everything. It remains to be seen if i can drive these with the power i want (8Kw of amplification per cabinet, so actual power input of 2-3Kw long term with good headroom) and get high reliability.
So far it looks good. Even with dust-caps blown off the speaker still produces good output
So far one cabinet has been run with 2 behringer ep2500's for at least 40 hours loud. One run of about 5 hours was with deliberately fattened-up heavily compressed bass with the two amps combined mains draw hitting 20 amps & a few breaker pop-outs, so I reckon the speaker got about 2-3Kw long term & didn't stop making bass! I slightly off-coloured (IE almost cooked) two of the ciares voice coils with this run too, they still work tho (one actually burst a damaged dust-cap that i'd reglued back on!) |
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What I cannot create, I do not understand
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FlipC
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Joined: 25 October 2007 Status: Offline Points: 666 |
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Posted: 13 April 2009 at 6:39am |
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asaa00
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Joined: 28 January 2008 Location: Los Angeles Status: Offline Points: 365 |
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Posted: 13 April 2009 at 7:40am |
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what midtops are those? they look sexy as hell
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roborg
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Posted: 06 May 2009 at 2:25am |
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they're a design i've made up, basically a dual 12" that can go down to meet the bass-boxes at over 100hz
xover at 100hz sounds really quick. at 130ish it still sounds good, >150hz starts to loose clarity) theres pix here: http://s128.photobucket.com/albums/p188/rave-roborg/new%20system/build/ its loaded with 2xsn12-b & beyma cp750ti on a p-audio ph-4230. The mid, like all dual 12"s sears your ears off when its loud, but this one skewers u with the spikes when its quiet
 The phase bungs/spikes fit to within 1cm of the drivers. When i get round to it/when some substantially better drivers than sn12b are invented, i might mould some fibreglass inserts. X-over to the driver is usually at about 800-1khz. I'm still looking for a really nice supertweeter to take over from the driver.cheers,
Rob
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What I cannot create, I do not understand
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asaa00
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Joined: 28 January 2008 Location: Los Angeles Status: Offline Points: 365 |
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Posted: 06 May 2009 at 4:11am |
wow your setup is amazing, so unique  |
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Sibulus
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Posted: 06 May 2009 at 9:17pm |
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lovely. nice to see something built for a purpose and some original ideas. I'd love to hear it, 8 ciares getting a decent wack of power could be very interesting!
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rich_gale
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Joined: 18 February 2008 Status: Offline Points: 2697 |
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Posted: 01 November 2009 at 4:40pm |
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cant believe i missed this roborg. i just found it while looking for info on the spl version.
what do you think are the main differences with yours and the original bdeap32? obviously you have double the drivers, and therefor your folding etc will be different. how does an original bdeap look inside? i notice you have included further horn shaping at the mouth.. why do you think the original bdeap doesnt have these pieces present at the mouth?
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REFLEX ALL THE WAY.... (however, im playing with horns again...) That ok Mister Valiant? :)
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asaa00
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Joined: 28 January 2008 Location: Los Angeles Status: Offline Points: 365 |
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Posted: 15 July 2024 at 11:45am |
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dude, do you still have plans for this? i would really like a DIY BDEAP
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Dhem
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Joined: 17 August 2025 Location: Toronto Status: Offline Points: 1 |
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Posted: 19 August 2025 at 12:09am |
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Hey roborg, I've been doing research on any available DIY Boundary Coupled subwoofer designs and yours was recommended in another old thread. I found your SketchUp model and completely re-drew it in CAD:  Do you mind if I published this new file (together with the original SketchUp model) on my GrabCAD page to make it more available for others to study & run simulations?
Edited by Dhem - 19 August 2025 at 2:09pm |
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_djk_ wrote: