Hyperbolic mid/upper bass horn

[sannax]

Have simulated a mid/upper bass horn that will cover 80hz to approximately 5-600hz.
The driver is a 15" inch McKenzie MKC 15.500BS. First time simulating in Hornresp (bare with me), so feedback is welcome before I am cutting wood.

I will make it a round horn, due to the other horns that will be a mid LeCleach and a tweeter horn LeCleach.

Why hyperbolic and not LeCleach? Well, size actually matters, and as I have understood the hyperbolic will load down to Fs, and I need that to integrate with my two JBL 2245H subs that will cover the lower octaves in both music and movies.

Midbass horn final.PNG

Midbass horn final SPL CD.PNG

Midbass horn final SPL 15degrees.PNG

Midbass horn final imp.resp.PNG

Midbass horn final schematic.PNG

Midbass horn final SPl 30degrees.PNG

[NEO Dan]

That's not very small...
Try this:

ID=28.00
Ang=1.0 x Pi
Eg=2.83
Rg=0.00
Fta=179.75
S1=232.26
S2=7272.02
Lec=29.02
F12=200.00
S2=0.00
S3=0.00
L23=0.00
T=1.00
S3=0.00
S4=0.00
L34=0.00
AT=17.97
S4=0.00
S5=0.00
L45=0.00
F45=0.00
Sd=800.00
Bl=18.83
Cms=1.59E-04
Rms=4.00
Mmd=65.67
Le=1.00
Re=5.90
Nd=1
Vrc=30.00
Lrc=20.00
Ap=0.00
Lpt=0.00
Vtc=2250.00
Atc=880.00
Pmax=100
Xmax=5.0
Comment=Example LEC FLH

[sannax]

I am not quite sure I follow you, NEO Dan? Not very small? Diameter about 90cm and lenght 105cm, just right

[NEO Dan]

Import the stuff above and see it done in 62l...

[sannax]

Ok, done it. What an SPL response But, if I have typed it right it seems the horn is 92cm in diameter and just 28,7 cm long?? How in the world can this horn load down that low? Everything I have read, uptil now, says that a LeCleach should be XOed an octave above the horns cut-off? The LeCleach 200 from Autotech is 96cm in diameter, and should be cut off by 350-400hz.
Please enlighten me!
Edit: what did you mean by "see it done in 62l"?

[NEO Dan]

I think that what you read about the cutoff and crossover would apply to HF and mid drivers where there is little if any control provided by the rear chamber volume, but in this case we can clearly model and adjust for this situation.
The system volume reported by Hornresp is < 62 liters so it is significantly smaller.
I have some concern about your driver, the low mms suggests a very thin cone so please take care in operation. If you are interested I am willing to help with some further details.

[NEO Dan]

A little typo in post#2, will not change anything but please adjust ATC to be the same as driver SD = 800. 800 seems a bit small, the surround would be very wide/wider than average anyway. I've never heard of McKenzie before, do you have any pictures of these drivers?

[sannax]

I am more than happy, if you will provide me with more information on this build
Btw: Is this type of LeCleach horn measured to go this low by any, or is it just simulations? I have never seen or heard anyone that has tried this.
I didn't think the backchamber could be used to tweak the respons this way either, guess I am learning something every day

[sannax]

Taken from the web: "For Info McKenzie were originally a separate company, then combined into "Fane-McKenzie". Then Fane-McKenzie were taken over by Wharfedale. Then Fane went out on their own again, and somewhere along the way McKenzie disapeared."

McKenzie15.500bs.png

[NEO Dan]

The rear chamber and throat chamber are simple in design but they will require some detailed measurements from your drivers. Most complicated would be the cone volume. The easy method would be to place your driver in a plastic bag like a garbage bag then fill the cone with something light weight like beans or rice. Most fun if done without explanation in front of spouse Also detailed measurements of the driver OD, mounting dia., mounting depth, and overall depth.

Robust looking driver!