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HD215 with combined chamber.

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Crazy Dane View Drop Down
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    Posted: 16 December 2018 at 8:50pm
Hi Guys.

Quick little question about the HD15. 
If i was to make a dual version, side by side like a Turbosound TSE215, would it then have any effect to make it with a combined chamber for both drivers, instead of seperate chamber for each driver?
Also, how much would it affect the performance if i made the cab 20cm deeper, and at the same time changed the curvatory of the horn flare so it matches the 20cm extra depth of the cap?

Regards... Frank


Edited by Crazy Dane - 16 December 2018 at 8:51pm
Best regards... Frank
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Crazy Dane View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Crazy Dane Quote  Post ReplyReply Direct Link To This Post Posted: 16 December 2018 at 10:28pm
A little something like this 🙂


Best regards... Frank
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Post Options Post Options   Thanks (0) Thanks(0)   Quote mobiele eenheid Quote  Post ReplyReply Direct Link To This Post Posted: 17 December 2018 at 12:24am
Having the drivers share the same chamber goes well enough but if something bad happens to one driver the other is more likely to follow than if they were in separate chambers. Having them in separate chambers shouldn't be much of a constructional problem and personally would leave a panel in there anyway, to function as bracing.

Increasing the depth, lowers the tuning of the cabinet by two means, increased horn length and chamber volume, meaning the lower usable limit and the upper usable limit shift down. The tuning in relation to the horn mouth changes, so it's likely the frequency response changes as well.

It's best if you simulate this before building anything.


Edited by mobiele eenheid - 17 December 2018 at 12:25am
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Post Options Post Options   Thanks (1) Thanks(1)   Quote Dub Specialist Sound Quote  Post ReplyReply Direct Link To This Post Posted: 17 December 2018 at 5:00am
tbh im not in favour of same chamber for drivers

as been said above
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Crazy Dane View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Crazy Dane Quote  Post ReplyReply Direct Link To This Post Posted: 17 December 2018 at 8:53pm
Just dusted of an old design project i made som years ago. Just for fun...
It started out as a tripple HD15, but i have made some changes to it now :)

Separate chambers for each driver, instead of one large chamber.
Bigger chambers and deeper cab with longer flare, compared to HD15.

Maybe someone has the time and desire to make some sims of the design?
Got two drivers i wanted to try out.
PD 154 and RCF LF15N401.

Anybody up for it?? :D



Best regards... Frank
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Post Options Post Options   Thanks (0) Thanks(0)   Quote efinque Quote  Post ReplyReply Direct Link To This Post Posted: 17 December 2018 at 9:17pm
I can already tell from the look of it that you need to brace it from the middle.
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Crazy Dane View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Crazy Dane Quote  Post ReplyReply Direct Link To This Post Posted: 17 December 2018 at 10:18pm
Off course, plenty of bracings in the horn mouth 🙂
Havent finished that part yet. 
Best regards... Frank
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Post Options Post Options   Thanks (0) Thanks(0)   Quote efinque Quote  Post ReplyReply Direct Link To This Post Posted: 17 December 2018 at 10:58pm
Other than that it looks like it's going to walk away any minute. Also very clever use of the excess material from the mounting holes, I've never really thought of that.

Edited by efinque - 17 December 2018 at 10:59pm
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Crazy Dane View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Crazy Dane Quote  Post ReplyReply Direct Link To This Post Posted: 20 December 2018 at 11:44pm
I have been reading and reading aaaand reading.
And now i have come to that conclusion that i should just build them as they are.. Standard HD15. 
But...! I would like to make the flare with 3 straight sections instead of a curve. So after alot of failed Google searching, i found some partial drawing of a plan regarding the 3 piece flare.

From those, i have made my own drawings. Can anybody confirm that my findings are correct and that it will work like the original HD15?
There are small chamber volume differences, and also small differences in the throat. Am i good to go?

Pictures here:

And last but not least.. I am trying to choose between PD154 and RCF LF15N401.
They will cost me the same, so wich driver would be the superior choice?


Best regards Frank 


Edited by Crazy Dane - 20 December 2018 at 11:45pm
Best regards... Frank
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Post Options Post Options   Thanks (0) Thanks(0)   Quote munkey Quote  Post ReplyReply Direct Link To This Post Posted: 21 December 2018 at 12:43am
https://forum.speakerplans.com/hd15-driver-sims_topic2617.html

Might be of some help. The link are broken and you need to click the images 
the midtops!
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Crazy Dane View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Crazy Dane Quote  Post ReplyReply Direct Link To This Post Posted: 21 December 2018 at 6:33am
Would not say that it helps alot 🙂
A Sim does not tell much about how the sound is. 

But I can almost figure it out, that the PD will be more harsh and have more attack. I have used it in some Cubo 215 cabs some time ago. Very Hard hitting! 


Edited by Crazy Dane - 21 December 2018 at 6:34am
Best regards... Frank
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Post Options Post Options   Thanks (0) Thanks(0)   Quote corell Quote  Post ReplyReply Direct Link To This Post Posted: 21 December 2018 at 7:05am
Both Chassis have to low qes for a frontchamber of that size. Try going with somehting more "moderate" around 0,28-0,3.
18sound 15NLW9401 comes to mind.
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