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HD15 honking help
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fat_brstd View Drop Down
Old Croc
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Joined: 23 August 2008
Location: Melbourne, OZ
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Points: 2184 		Post Options Post Options   Thanks (0) Thanks(0)   Quote fat_brstd Quote  Post ReplyReply Direct Link To This Post Posted: 06 August 2025 at 1:12am
Originally posted by paulus paulus wrote:

i used hd15 for 10 years loaded with pd154( mad bl for a 15 inch )  and time aligned to my scoops , i cut them 75 to 125 and they were bloody good indeed 



I run the same (PD154 in HD15) and cross from 77hz to 154hz into the 12" section from an mt121

The biggest issue with HD15 is trying to play them too high. I feel if you are getting less than 1 octave from a box then its probably not suited to doing what you are asking of it.
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levyte357- View Drop Down
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Points: 8517 		Post Options Post Options   Thanks (0) Thanks(0)   Quote levyte357- Quote  Post ReplyReply Direct Link To This Post Posted: 06 August 2025 at 2:19pm
I would say, the plot I quoted, clearly shows the natural response, needs serious smoothing, to get a desirable result.

If with purely cutting, not boosting, engineer can obtain average of 105db sensitivity, from single driver 15" cab, 80-200hz, that is a win win.

But then, many would argue, 102db average sensitivity, from a 2x15 reflex, 70-280hz, with little or no smoothing, for ruler flat response, might be better.


Edited by levyte357- - 06 August 2025 at 2:20pm
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Steve20131 View Drop Down
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Points: 460 		Post Options Post Options   Thanks (0) Thanks(0)   Quote Steve20131 Quote  Post ReplyReply Direct Link To This Post Posted: 30 September 2025 at 9:32am
Like horns in all bandwidths there are standing waves, especially in horns with folds.  I'm not sure it's a purely f/response issue.  You could try some wall damping especially inside the cab (if it opens...)




Edited by Steve20131 - 03 October 2025 at 8:19pm
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