I tried to mess around with Akabak to simulate a design I am working on. But I can see that I do not have the time and/or intelligence to learn the scripting. I hope someone with more skill can run a relatively simple script for me? (except the more complex Karlson aperture script but that should be "on the shelf" already somewhere i guess)
I am building a non tapered transmission line ending with a Karlson aperture. Basically a tall column with the driver firing up. The back wave goes into a pipe and folds once back up through a bigger pipe around the first pipe. In my foamcore prototype the total TL is 210 cm long, has a cross section of 220cm3 (1.5xSd) and the K-aperture is in the last 1/4 of the pipe (52.5cm)
The prototype doesn't play very low....around 60hz but maybe that is because of cabinet flex. When i play low test tones everything moves! Maybe with a stiffer cabinet it plays lower. But before I start cutting wood I would like to know how long I should make the transmission line and what dimension I should give the K-aperture in order to get the smoothest low frequency response and response below 40Hz. I try to avoid tapering the line because it is harder to build but if it makes the response a lot better I may have to taper anyway. I could taper from 2xSd to 1xSd.
The Transmission line will cross over to the midrange around 400Hz with a first order slope.
Driver: Peerless SDS-160F25PR01-08 6-1/2" Paper Cone Woofer Speaker.
SD=141cm2
fs=42Hz
Mms=13.7g
Qms=2.97
Qes=0.58
Re=7.1ohm
Cms=1.0583mm/N
Vas=29.56L
Bl=6.64Tm
I am building a non tapered transmission line ending with a Karlson aperture. Basically a tall column with the driver firing up. The back wave goes into a pipe and folds once back up through a bigger pipe around the first pipe. In my foamcore prototype the total TL is 210 cm long, has a cross section of 220cm3 (1.5xSd) and the K-aperture is in the last 1/4 of the pipe (52.5cm)
The prototype doesn't play very low....around 60hz but maybe that is because of cabinet flex. When i play low test tones everything moves! Maybe with a stiffer cabinet it plays lower. But before I start cutting wood I would like to know how long I should make the transmission line and what dimension I should give the K-aperture in order to get the smoothest low frequency response and response below 40Hz. I try to avoid tapering the line because it is harder to build but if it makes the response a lot better I may have to taper anyway. I could taper from 2xSd to 1xSd.
The Transmission line will cross over to the midrange around 400Hz with a first order slope.
Driver: Peerless SDS-160F25PR01-08 6-1/2" Paper Cone Woofer Speaker.
SD=141cm2
fs=42Hz
Mms=13.7g
Qms=2.97
Qes=0.58
Re=7.1ohm
Cms=1.0583mm/N
Vas=29.56L
Bl=6.64Tm