Hd15 - my versioin |
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levyte357-
Old Croc Joined: 27 July 2012 Location: UK, South East Status: Offline Points: 8128 |
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EDIT: Seems lengthening horn might compromise output above 180hz ? Edited by levyte357- - 31 July 2013 at 6:16pm |
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Global Depopulation - Alive and Killing.
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bee
Old Croc Joined: 14 June 2011 Location: Middlesex Status: Offline Points: 4553 |
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If we increase depth of cab to 700mm, altering panels that dictate chamber size/throat also, thereby extending horn length, by approx 50mm, would addition in horn length be quantifiable ?yes.
Is it worth widening cab to the 478mm of HD15, to ensure chassis clearance for all 15" drivers? let the best volume for the rear and front chamber dictate the width of the box. Also thinking driver loading hatch should be large enough to allow easy access to each bolt for driver mounting. as long as the driver fits through the access panel it big enough. don't worry too much about ease of loading, once loaded the drivers will only come out if you blow them The other thing is its ok modding a design but you still need to no how this design works..... a clue into how, is the correlation between the front and rear chamber..... Edited by bee - 31 July 2013 at 6:17pm |
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https://www.elements-audio.com
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bee
Old Croc Joined: 14 June 2011 Location: Middlesex Status: Offline Points: 4553 |
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why are you worried about the output above 180hz, it wont play much higher with out honking..... its a trait of the bhp design. you will get a 12" bhp up past 250hz with out honking...
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https://www.elements-audio.com
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levyte357-
Old Croc Joined: 27 July 2012 Location: UK, South East Status: Offline Points: 8128 |
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Sorry, edited my post, while you were writing yours.
Would be interesting comparing the graph/input data/driver you used, when you stated output was peaky, as the sim I did with Fane Sov Pro 15-500, and couple of other drivers, didn't have huge dip at 125hz. There's plenty of 18" BPH out there, that will do massive 50-60hz, but that's not what I'm after. As it's stretch getting anything above 150hz out of them. I'll settle for 15" BPH cab, that'll do strong 180hz, even if shorter horn dictates HPF=75hz@24db rolloff, to withstand 500W. Edited by levyte357- - 31 July 2013 at 6:29pm |
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bee
Old Croc Joined: 14 June 2011 Location: Middlesex Status: Offline Points: 4553 |
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ok im going to be nice to you, and offer a big bit of help, run your sim but sim a stack of 6, you will see that the plot cuts off on your design at around 175hz, this will be were your box in single will start to sound honky. This info was found out by me after simming over 20 bhp designs and comparing rta plots to the hr sim.... the cabs I tested were a mixture of 18" 15" and 2 21" designs.
What your wanting is what knet (ken) wanted, I spent 2 years looking at every aspect of the bhp design to get it perfect for kens needs. so it can be done.... The bhp's I built for Boots hi-fi were a very slight modification to kens, which give a bit more spl in the 125hz region, but don't play as low 5hz less and don't play as high 5hz less.....
Edited by bee - 31 July 2013 at 6:43pm |
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levyte357-
Old Croc Joined: 27 July 2012 Location: UK, South East Status: Offline Points: 8128 |
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Very gracious of you sir. Which driver did you sim with, as I need to reproduce your findings, before trying other drivers. |
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bee
Old Croc Joined: 14 June 2011 Location: Middlesex Status: Offline Points: 4553 |
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driver choice makes no difference to were the honky ness starts, its a negative in the bhp design..... run the sim and it will say 175hz 180hz max.... im 100% sure with out even re simming it....
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Teunos
Old Croc Joined: 23 November 2008 Location: The Netherlands Status: Offline Points: 1799 |
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Conclusion, usable range for the cab as it stands without modifications is 75-180 Max bandwidth. Is this satisfactory? Will try the sim with the Fane Lev.
500W won't be a problem with either the RCF i started with or the B&C which was my best candidate. I try them with 1000W and see what excursion does. Due to load on the cone of the horn it stays under 6-7mm with most woofers. Edited by Teunos - 31 July 2013 at 7:08pm |
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Best regards,
Teun. |
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levyte357-
Old Croc Joined: 27 July 2012 Location: UK, South East Status: Offline Points: 8128 |
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Ignoring HR warnings about inaccuracy, plot for Fane Sov Pro 15-500, Assumming 4PI plot, before selecting Multiple speakers ? One of the experts can explain which plot is relevant to Bee's instruction. EDIT:Plots obtained with Linux MiNT 15 x64, running hornresp on Win 7 x32 in Virtual Box VM.. Edited by levyte357- - 31 July 2013 at 7:35pm |
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bee
Old Croc Joined: 14 June 2011 Location: Middlesex Status: Offline Points: 4553 |
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Your second plott would be the more true to life plott and real life operating band.
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bee
Old Croc Joined: 14 June 2011 Location: Middlesex Status: Offline Points: 4553 |
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So of you now take the high cut off point and use this as a cut off point for a single, that will give you a more true to life plott
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levyte357-
Old Croc Joined: 27 July 2012 Location: UK, South East Status: Offline Points: 8128 |
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Nice one point, mate.. Will also try LPF=200, seeing as according to sim, should be @ approx only -1.5db off, |
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