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Tapped Horn, Tearing my hair out!!

post #1 of 5
Thread Starter 
Hi All,

Been trying to model a tapped horn sub using some old car audio subs Ive had for years.
Thought I had a handle on Hornresp but I jst cant seem to get a decent looking model. The ones Ive come up with are frankly too embarrasing to post...
Can anyone help?
Specs are as follows,

Audiobahn Alum 12
FS 21HZ
QMS 3.46
QES .39
QTS .35
VAS 117L
SD 500cm2
RE 5.4x2 (DVC)
SPL 86.4
XMAX 16mm
BL 17.83

I was trying to combine two drivers into one horn, voicecoils wired and drivers in parallel.
Thanks for any help you guys can give.
post #2 of 5
I am literally no expert, and just knocked this up between meetings, but I get a reasonably flat response from 20Hz (with a peak at 80 to be eq'd) with:

S1 360
S2 401.68 (auto)
S3 866.3 (auto)
S4 970

L12 41
L23 457
L34 102

600cm & 400 Litres

I only get a BL of 17.8 with an Re of 5.4. Not sure if that's the correct value to use though.
post #3 of 5
Quote:
Originally Posted by batfink007 View Post

I am literally no expert, and just knocked this up between meetings, but I get a reasonably flat response from 20Hz (with a peak at 80 to be eq'd) with:
With what sensitivity? If it's not at least 6dB higher than a ported box it's not worth the effort, let alone the box size.
post #4 of 5
Just wait until you try to fold it. Tapped horns are hard to do. Front loaded horns are easier, but will take up more space, but will also not necessarily need a high pass, which is mandatory in almost all tapped horns.

Tapped vs front loaded horns are like vented vs band pass boxes. One is easier to do.

If you are willing to put the hours in to learn all the ins and outs (think about 3-10 prototypes), you can get decent at designing bass horns. Otherwise, there are many proven designs (Lilmike, Ricci, jbell at DIYAudio, my old insubnia at AudioKarma, OKWolf's Wolfhorns, BFM).

Lilmike and I have written basic tutorials, and hornresp is now more powerful.

Also, if you have not measured your drivers, do not trust mfg specs and spend hours and hours using them in hornresp.

JSS

EDIT - Added OKWolf to that list above...
Edited by maxmercy - 2/21/13 at 6:35am
post #5 of 5
I wouldn't go lower than 25Hz or so with a single 12. They simply don't move enough air to be worth it. Two could get you below 20Hz without too much trouble. There are also better drivers to use, though, if those specs are accurate. High-ish Vas means big cabinet, and I'm a little concerned about the motor strength.
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