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HD215 with combined chamber.

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Category: Plans
Forum Name: HD 15 horn
Forum Description: Discussion / Questions about the HD 15 horn
Printed Date: 07 February 2023 at 8:09am
Software Version: Web Wiz Forums 12.05 -

Topic: HD215 with combined chamber.
Posted By: Crazy Dane
Subject: HD215 with combined chamber.
Date 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

Best regards... Frank

Posted By: Crazy Dane
Date Posted: 16 December 2018 at 10:28pm
A little something like this πŸ™‚" rel="nofollow -

Best regards... Frank

Posted By: mobiele eenheid
Date 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.

Posted By: Dub Specialist Sound
Date Posted: 17 December 2018 at 5:00am
tbh im not in favour of same chamber for drivers

as been said above

Musical Roots Reggae Vibration is Life! for music is sound...sound is vibration...vibration is energy... and energy begets life. Therein lies my passion!...MUSIC IS LIFE...

Posted By: Crazy Dane
Date 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

Posted By: Crazy Dane
Date Posted: 17 December 2018 at 10:18pm
Off course, plenty of bracings in the horn mouth πŸ™‚
Havent finished that part yet. 

Best regards... Frank

Posted By: Crazy Dane
Date 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:" rel="nofollow -

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 

Best regards... Frank

Posted By: munkey
Date Posted: 21 December 2018 at 12:43am" rel="nofollow -

Might be of some help. The link are broken and you need to click the images 

the midtops!

Posted By: Crazy Dane
Date Posted: 21 December 2018 at 6:33am
Would not say that it helps alot πŸ™‚
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! 

Best regards... Frank

Posted By: corell
Date 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.

Posted By: Crazy Dane
Date Posted: 21 December 2018 at 8:57am
Ermm Pd154 is the recommended driver for this cab, and the Lf15n401 Sims almost the same.
But I will take a look at what you recommend also πŸ™‚

Best regards... Frank

Posted By: corell
Date Posted: 21 December 2018 at 9:56am
i know, but imo the "original" Hd15 is not a nice cab at all. it has a brutal and unpleasant sound to me.
Same as every low qes driver in a BPH, after simming and hearing quite some.

Posted By: Crazy Dane
Date Posted: 21 December 2018 at 11:18am
Interesting. I also think the pd154 loaded Cubo215 had very aggressive and harsh sound to it. But at the same time a really Nice kick.

You think the 15nlw9401 will deliver a more rounded and smooth kick?
What about 15lw2400? Looks to be just about the same driver, with ferrite and about 20% cheaper. Price isnt critical, but i dont need to save weight πŸ™‚

Best regards... Frank

Posted By: corell
Date Posted: 21 December 2018 at 11:48am
yeah that is the ferrit Γ€quivalent and works aswell. not sure if the magnet fits inside the chamber, check that please ! ;)
It will be a smoother tone but still far from "washy" if you get what i mean.

Posted By: Crazy Dane
Date Posted: 21 December 2018 at 12:13pm
Might be a good idea to check that πŸ™‚
Or else, neo must be the way. 
I am mostly conserned about the strength of the cone.
I will from time to time be running a double on each side for small gigs. So it will be highpassed pretty "low". 
So its not all kick duty. "sub" duty will also be needed sometimes. 

Do you have any comments on the curved-to-3piece convertion? Or is it just all dandy and great that way? πŸ˜„

Best regards... Frank

Posted By: corell
Date Posted: 21 December 2018 at 2:08pm
its a matter of looks. acoustics wise, 3 piece is totally fine.
15nlw9401 has carbon reinforced cone, iirc. way stronger than pd154 for sure.
You wont get usefull output below 60Hz, no matter what you put inside though.

Posted By: Crazy Dane
Date Posted: 21 December 2018 at 3:31pm
I am thinking more about the measurements in the start of the horn flare where flare and front chamber meets. 

It is not excactly the same, but very close.

About the driver, i think that should be strong enough then πŸ™‚
And Its actually the same price as PD154 when discount has been added.

I know 60hz isnt low low, and thats also fine. 
If i need them to go lower, i will ad more. 2 stacks of 6 drivers each should make it a bit lower i guess πŸ™‚

Or else, if i really need some grunt, i will add some dual18 BR boxes. 

Best regards... Frank

Posted By: FOO
Date Posted: 23 December 2018 at 1:45pm
New user.. I have experienced some major problems with my e-mail and other accounts being hacked. So i have been forced to shut them all down and therefore i have made a new user here also.. 

Best regards..  Frank, now known as FOO. 
Formerly know as Crazy Dane πŸ™‚

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