Dual 15 + coax |
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dlyxover
Old Croc Joined: 14 June 2007 Location: Liverpool Status: Offline Points: 1502 |
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looking very tidy, keep up the good work.
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In the Truth there is no news, and in the News there is no truth
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kipman725
Registered User Joined: 02 September 2020 Location: Warrington Status: Offline Points: 231 |
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There looks to be some scope for reducing the depth of the box if you have enough internal volume for the bass drivers?
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doober
Young Croc Joined: 03 January 2006 Location: Cornwall UK Status: Offline Points: 1118 |
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This was supposed to be a quick project, but then I had a really busy summer and no spare time.... back on it now though.
I put the drivers in for a test A quick outdoor measurement A quite worrying dip around 500Hz. I tried moving the mic around, disconnecting one driver, adding and taking bits of box, and then realised the obvious point that a half wavelength of 500Hz is pretty much the diameter of a 15" driver, which I was listening to from the edge. I modified the baffles and moved some bits in the box Another measurement That's reduced the problem. I need to do more measurements when the weather is good enough, but I think it looks promising. I did a measurement of the mid section I'm thinking a 24dB/octave high pass with the -6dB around 600Hz should be okay. |
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jazomir
Old Croc Joined: 20 November 2006 Location: Sunderland UK Status: Offline Points: 1710 |
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Slightly off topic, but I came across this the other day - Bennett Prescott sales manager of B&C with a new 2x15 + horn design. Bit (?!) big for pole mounting but sounds very good via utoob - amazing that that it doesn't have any noticeable horn sound on vocals possibly like the Celestion aperiodic driver that removes any crossover artifacts in most of the vocal range.
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For sidefills, can we have two enormous things of a type that might be venerated as Gods by the inhabitants of Easter Island, capable of reaching volumes that would make Beelzebub soil his pants.
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toastyghost
The 10,000 Points Club Joined: 09 January 2007 Location: Manchester Status: Offline Points: 10919 |
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It’s probably more to do with using a bloody massive horn that was explicitly designed around the (very good) driver attached to the end of it, by proper engineers using top-tier tools such as FEA-based optimisation
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jazomir
Old Croc Joined: 20 November 2006 Location: Sunderland UK Status: Offline Points: 1710 |
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Still, nicely done and not too dissimilar to the JTR 215RT speakers with the co-axial HF driver.
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For sidefills, can we have two enormous things of a type that might be venerated as Gods by the inhabitants of Easter Island, capable of reaching volumes that would make Beelzebub soil his pants.
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Keen
Young Croc Joined: 30 May 2011 Location: Brisbane, Aus Status: Offline Points: 1203 |
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great to see they made that horn, thanks for sharing
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doober
Young Croc Joined: 03 January 2006 Location: Cornwall UK Status: Offline Points: 1118 |
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More progress. I now have 2 boxes. Both have had 2 coats of paint sprayed on and are awaiting a gentle sand and 2 thick coats of paint. I did a test with pole mounting an empty box
The pole is a K&M adjustable with an M20 screw on the base and the expanding ring lock on the top. There is a bit of sway at full extension, but that is to be expected. A single punisher as a base gets the top box just high enough, I will always be using at least 2 though. I didn't like the idea of a surface mounted pole socket, so I knocked this up out of 3mm steel It has an M20 nut welded inside, and fixes with 6 bolts into the horn/driver chamber and 2 through to the exterior with a plate on the outside to spread the load. I had hoped to have the boxes finished ready to use for a couple of gigs next weekend. Unfortunately I can't get another DCX464 driver in time, there doesn't appear to be any stock in the UK. |
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Teunos
Old Croc Joined: 23 November 2008 Location: The Netherlands Status: Offline Points: 1799 |
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Hello Doober,
Did you finish these boxes by now? I'm very curious to the results of this design
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Best regards,
Teun. |
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doober
Young Croc Joined: 03 January 2006 Location: Cornwall UK Status: Offline Points: 1118 |
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They are finished. I've been using them since December for live music, 2-400 capacity events indoors and outdoors. I like them. The midrange is very clear, the boxes are light enough to get up above head height on a pole. The coax drivers are very efficient, and could easily keep up with way more than the 15s I am using. I do like headroom in the mid and high though. The 2 boxes work well with 4-8 punishers, crossing over around 90Hz. If I used some upper bass boxes between them and took the crossover up to around 180Hz I could get a lot more out of the 15s. |
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cobrasneverdie
Registered User Joined: 18 July 2022 Status: Offline Points: 16 |
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Is there a reason for choosing b&c over bms for crossing that low? My bms 4592nd loads incredibly well all the way down to the horn cutoff on a massive 225hz multicell.
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MarjanM
Old Croc Joined: 10 February 2005 Location: Macedonia Status: Offline Points: 7816 |
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Why did you chose that specific 15 inch driver? To me its a shame using top of the line compression driver with a budget 15.
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Marjan Milosevic
MM-Acoustics www.mm-acoustics.com https://www.facebook.com/pages/MM-Acoustics/608901282527713 |
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