double 12 inch+1,4 inch plans |
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ceharden
The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776 |
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I didn't realise there were pics of that on the net! (Edit: turns out it's hosted on my own site ) That's as far as that prototype got. Twin 12 had a hell of a kick to it! My other twin 12+1.4 is a bit more conventional, don't have any pics to hand unfortunately. But you might want to look at this which is very similar: http://www.bluearan.co.uk/index.php?id=JMSKIT2214&browsemode=manufacturer Edited by ceharden - 15 August 2017 at 9:04pm |
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DMorison
Old Croc Joined: 14 March 2007 Location: Aberdeen Status: Offline Points: 1649 |
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In Chrome at least: Right click on the "Please update your account" image and "open image in new tab" - that'll take you to the photofuckit page where the image is hosted, then do the same again.
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DMorison
Old Croc Joined: 14 March 2007 Location: Aberdeen Status: Offline Points: 1649 |
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P Audio have a box plan on their website with plenty space for the HF flare you're using: http://www.paudiothailand.com/pac/index.cfm/system-designs/.
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DMorison
Old Croc Joined: 14 March 2007 Location: Aberdeen Status: Offline Points: 1649 |
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Hope you don't mind but I snagged a copy when you posted way back when: |
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DMorison
Old Croc Joined: 14 March 2007 Location: Aberdeen Status: Offline Points: 1649 |
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As long as A: the tuning frequency of the ports is sensibly low (ie not up in the hundreds of Hz range) and B: you don't push the box right back against a hard boundary like a wall, then rear mounted ports will work just exactly the same as front mounted. One other thing that may explain them being less common on pro boxes - front mounted ports are easily kept behind the grille, so there's no danger of foreign objects getting in to them to either block them and make them less effective or even damage your cones inside the cab. Cheers, David.
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snowflake
Old Croc Joined: 29 December 2004 Location: Bristol Status: Offline Points: 3122 |
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they don't work EXACTLY the same - there is a path length difference between the driver and port output that can give a cancellation. or it can work fine - easily modeled in most software. |
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DMorison
Old Croc Joined: 14 March 2007 Location: Aberdeen Status: Offline Points: 1649 |
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OK, technically correct, yes. (The best kind of correct, according to many... ) Practically speaking, as long as the tuning frequency is reasonably low and the box isn't too deep, the extra phase shift will only be a small proportion of the wavelengths involved, so won't cause any actual cancellation. For example, a 500mm deep box tuned to 60 Hz - the box depth is only 0.087λ, therefore only 31.4o of phase shift.
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ceharden
The 10,000 Points Club Joined: 05 June 2005 Location: Southampton Status: Offline Points: 11776 |
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Haha, excellent. I can update you that the mid-tops have just been prepared to go back into service after a couple of years off. I blew a driver and it's taken me two years to get round to doing the recone! The twin 18" pictured got cut into two singles and did many years service before finding a home in a local venue.
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noviygera
Registered User Joined: 17 July 2009 Location: Chicago, USA Status: Offline Points: 55 |
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What's the crossover between mid/high?
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noviygera
Registered User Joined: 17 July 2009 Location: Chicago, USA Status: Offline Points: 55 |
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for these...
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smitske96
Young Croc Joined: 16 February 2016 Location: The Netherlands Status: Offline Points: 1092 |
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Between de 12" and coax HF? Around 650Hz.
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nojunk
Registered User Joined: 12 January 2008 Location: Germany Status: Offline Points: 65 |
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read here: https://soundforums.net/community/threads/60-degree-diy-mid-hi-aka-pm60.12390/
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