HD 15 horn - HD15 curve

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HD15 curve

Printed From: Speakerplans.com
Category: Plans
Forum Name: HD 15 horn
Forum Description: Discussion / Questions about the HD 15 horn
URL: https://forum.speakerplans.com/forum_posts.asp?TID=88985
Printed Date: 27 March 2026 at 2:16am
Software Version: Web Wiz Forums 12.08 - https://www.webwizforums.com

Topic: HD15 curve

Posted By: DaveMarks
Subject: HD15 curve
Date Posted: 08 October 2014 at 2:08pm

Hey guys im building 2 HD15s. got a couple of questions...

1)Dad ordered my wood and got it wrong and got 6mm ply for the curve , is this too thick to bend the radius it needs to. Although I know its not ideal was wandering if it was possible.

2)what driver would be best to use? eminence kappa 15 LF or p-audio E15-600s 600w

Replies:

Posted By: stitchy
Date Posted: 08 October 2014 at 2:23pm

you need 3mm ply for the curve, driver wise I would go for the eminence

Posted By: mini-mad
Date Posted: 08 October 2014 at 3:05pm

Do it the old boat makers way... heat the wood up using steam and then very slowly using a jig bend it over a period if time.

...or buy 3mm ply.

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If it sounds like a gorilla is trying to escape, turn it down.

Posted By: andycw
Date Posted: 08 October 2014 at 3:49pm

People say the Thomann branded 15's are better(and cheaper)than the Kappa. How true that is I don't know.

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No Bass No Fun

Posted By: njw
Date Posted: 08 October 2014 at 7:34pm

I used three layers of 6mm ply when I did the curves on mine and you are correct, it will not bend to the radius required, I found a way around this however, I routered shallow grooves, about 2mm deep out of the wood about every 30mm along on the panel with a 6mm bit, this gave the wood the flexibility it needed to bend into a tighter radius then I took my time using plenty of screws and glue between the layers of ply to fasten everything together.

Posted By: mini-mad
Date Posted: 08 October 2014 at 7:36pm

Sounds like a lot of hard work wen you could have just bought 3mil. Oh well if its all you have or you have days on end to spend building them, Go for it!!

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If it sounds like a gorilla is trying to escape, turn it down.

Posted By: njw
Date Posted: 08 October 2014 at 8:10pm

Yep! 3mm would have been far more preferable, but I already had two sheets of 6mm sitting about doing nothing so thought I would put it to use.

Posted By: DaveMarks
Date Posted: 08 October 2014 at 8:21pm

It's all good , got a sheet of 3mm on the way , cheers guys

Posted By: djyves
Date Posted: 08 October 2014 at 11:37pm

I used 8mm "bending plywood" for mine.

It's plywood with all the veins/grains in the same direction.

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"If brute force doesn't work, you're just not using enough!"

Posted By: Neurosub
Date Posted: 27 May 2015 at 9:48pm

I have 2x HD215 and have been using the kappa pro lf2 for years.
They sound good.

I have them crossed at 120 ish to avoid the definition loss above that. (honking)
85 cut off below.

Cheap too - just ordered 4 @ 160 each here in Canada. Yesterday.