~50 lb tapped horn, woofer under $100, high efficiency, low power?

[GM]

Originally Posted by turbodawg

How about a Dayton 12" PA310-8...?

Maybe this one can be made to fit.

GM

[turbodawg]

Originally Posted by Brian Steele

Unless the program you're using for box modelling allows you to do the same adjustment for the vented alignment you're looking at, I suggest not doing this. Alternatively, use HornResp to model the vented alignment as well, so you can compare them directly in the same program.

Interesting idea though, putting in a "pinch" at S3 to reflect the effect of the driver on the cross-sectional area around there.




The mounting depth for the 2512 is 5.6", so that's not probably going to work out too well if you're planning to just bolt the driver to one side of the mouth. However, with 360 cm^2 available at S2, it might be possible to come up with a creative way of squeezing the driver in (e.g. magnet facing into S2, and mounting rings used at S3 to raise the driver up an inch or two so the magnet stands clear of the wall).

I took the volume of the driver and used the equation for a volume of a cone to back calculate the approximate cross section of the driver, then subtracted from s4 in the sims. I think it's about as accurate as you can get.

I used hornresp to sim the BR also at 2pi and same voltage, and got shockingly similar results.

[turbodawg]

Originally Posted by GM

Maybe this one can be made to fit.

GM

I don't see length dimensions in that text file, can attach parameters and response?

[GM]

Import the file into HR as a new, complete design.

GM

[Brian Steele]

Originally Posted by GM

Import the file into HR as a new, complete design.

GM

HornResp croaked when I did that. And when I tried inputting the figures manually, it complained about S1, showing a "Cir < 1" (or something like that) warning.

I've used the PA310 (still using it in fact) in a TH. See The Subwoofer DIY Page v1.1 - Projects : "Proof of Concept #2"

If I was to build it over again, I'd use better cross-bracing in the top and bottom sections and make S4 a bit larger. This is a pretty big box for a 12" though, certainly much larger than the 56 liter vented box for the 2512 being considered earlier in this thread.

This also looks interesting:

ID=28.00
Ang=2.0 x Pi
Eg=2.80
Rg=0.00
Fta=-0.32
S1=370.00
S2=364.21
Par=17.10
F12=0.00
S2=364.21
S3=307.01
Par=169.00
F23=0.00
S3=307.01
S4=300.00
Par=20.70
F34=0.00
S4=0.00
S5=0.00
L45=0.00
F45=0.00
Sd=530.90
Bl=16.65
Cms=2.47E-04
Rms=2.20
Mmd=60.38
Le=0.40
Re=5.20
TH=1
Vrc=0.00
Lrc=0.00
Ap1=0.00
Lpt=0.00
Vtc=661.30
Atc=540.00
Pmax=100
Xmax=5.0
Comment=Dayton PA310-8 (WT3) 39 Hz

Much smaller box, but a bit of efficiency is given up and the response seems a bit worse above 100 Hz.

[GM]

No clue why, I just downloaded it to the import file and loaded it from there with no problems. Ignore the caution, it's due to the first segment terminating to a point. Do you have the latest HR? V29.10 -120519

FWIW, compared it at 250 W to a BR of the same net Vb using a sufficiently large 6" dia. vent:

GM

[David McBean]

Originally Posted by GM

Do you have the latest HR? V29.10 -120519

Hi GM,

Just to clarify - the latest release of Hornresp is actually Product Number 2910-120829 :-).

Kind regards,

David

[turbodawg]

Originally Posted by turbodawg

I don't see length dimensions in that text file, can attach parameters and response?

Duh, forgot about "par" being the length. That was the first time I've looked at the parameters in text file format.

[turbodawg]

Originally Posted by Brian Steele

HornResp croaked when I did that. And when I tried inputting the figures manually, it complained about S1, showing a "Cir < 1" (or something like that) warning.

I've used the PA310 (still using it in fact) in a TH. See The Subwoofer DIY Page v1.1 - Projects : "Proof of Concept #2"

If I was to build it over again, I'd use better cross-bracing in the top and bottom sections and make S4 a bit larger. This is a pretty big box for a 12" though, certainly much larger than the 56 liter vented box for the 2512 being considered earlier in this thread.

I'm amazed that I haven't seen that before, it didn't show up in google search. Looks good, thanks for posting it up!

[GM]

Originally Posted by David McBean

Hi GM,

Just to clarify - the latest release of Hornresp is actually Product Number 2910-120829 :-).

Kind regards,

David

Greets!

Thanks, so much for relying on DIYaudio's email posting updates.

GM