Building three way JMLC iwata styled horns

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Cort

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Joined 2011
#1
Hi everybody,
I have lurked for a few years and learned a bunch from you guys. Would love to have your input on my upcoming build.
First a little intro is in order; It all started a few years ago, when I built the mini statement L/R/C designed by Curt Cambell and jim holtz; documented here.
http://www.htguide.com/forum/showthread.php?37837-Corts-mini-statement-build.

Then I wanted a subwoofer and wound up with a 24" long bass horn under my house. documented here.
The Crawler, A Floor joist horn build

I have since built a pair of ported surround and tapered quarter waves based loosely on jeds r44 design.

It all sounds really good, but the bass horn is awesome so I decided it's time to upgrade the mains with JMLC iwata style horns similar to Yuichi Arias.

So far I have gotten hornresp designs done for the;
mid bass @ 80-400ish using the B&C 15Fw76
Mid @ 200-3000 using the B&C DCX50

Havn't done the top end yet but am thinking the B&C DE250 will round it out open to suggestions

Any input on the driver selection would be appreciated.
Cheers
Cort
 
#2
Hello,

The floor exit bass horn - sweet? Is it 24 feet long?

Is the 200-3000 for real with the DCX50 compression driver? Looks to be more of a 500 Hz driver.

The B&C 250 isn't so great a treble driver. Look at the little 1" TAD or Celestions for better sound.
 
#3
Yes the bass horn is 24 ft long with the mouth partially under the couch.
F3~ 16 Hz
The 200-300 horn the mid horn is the design spec. the crossover will be twice that. the DCX50 recommends crossover 12db/octave at 400hz. Is that realistic? It is important to me to get this right before I finalize design on the bass horn.
Thanks for the recommendation on the tweets I will look into them.
 
#4
Cort said:
Yes the bass horn is 24 ft long with the mouth partially under the couch.
F3~ 16 Hz
The 200-300 horn the mid horn is the design spec. the crossover will be twice that. the DCX50 recommends crossover 12db/octave at 400hz. Is that realistic? It is important to me to get this right before I finalize design on the bass horn.
Thanks for the recommendation on the tweets I will look into them.
Click to expand...

I've never actually used that driver - isn't it a coaxial? Most 4" compression drivers struggle when used below 500-600 Hz. A driver that is less expensive to cover the midrange is the Selenium D405. With the D405 you won't be paying for the coaxial and can use the extra money for the rest of the stuff. The D405 will probably perform as well as the B&C if it's just used as a midrange driver. A 200 Hz flare Iwata horn will be massive.
 
#5
The B and C is a coax, I have not been able to really find any reviews of it, which is a concern, the selinium you suggest looks interesting, The phenolic version? I think I can get the bass up to near 600 before running out of throat chamber volume. The iwata I am looking at building at 220 hz is just a little bigger than autotech 300 but will match the bass horn in width. Hopefully somebody someone here has some experience with the b and c and will help.
Cheers
Cort
 
#6
The D405 / ti is cool where you can go between the phenolic and snow flake titanium in the same chassis. The titanium actually does the low end of the midrange better but the phenolic is close and has a bit more center mid presence.

B&C also makes a paper single diaphragm compression driver, I think they call it the DCM50 - it may be a really good sounding mid 🙂

http://www.bcspeakers.com/products/hf-driver/2-0/dcm50
 
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#7
Thanks, the other one that came up is the Radian 850 or 950. which has lots of positive reviews. with some reporting the 950 sounding good below 400.
The 405 looks good, although my thought is that, if I am going to build horns, which can always become firewood, I should get the best mid priced driver I can find.
 
#8
Cort said:
The B and C is a coax, I have not been able to really find any reviews of it, which is a concern, the selinium you suggest looks interesting, The phenolic version? I think I can get the bass up to near 600 before running out of throat chamber volume. The iwata I am looking at building at 220 hz is just a little bigger than autotech 300 but will match the bass horn in width. Hopefully somebody someone here has some experience with the b and c and will help.
Cheers
Cort
Click to expand...

if you use the DCX50 as intended you don't need another tweeter as there is a tweeter in coax.
if you prefer using a separate tweeter i would recommend using the DCM50 without the tweeter coax. the dcm50 can work from 400hz up and possibly higher then 3000hz , i would even try to run them up to the 8000 hz range and just use a super tweeter .
 
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