Hi,
A tapped horn has a limited bandwidth: about 2 octaves, lets say from 30Hz to 120Hz the upper cutoff.
Beyond the 'upper cutoff' of the horn, it becomes too big and there is comb filtering sort of response higher up,
the delay of the rear wave of the horn is just too much for the ever increasingly smaller wavelengths.
What if the the rear is band limited, ie acoustically low pass the rear so that it stays muted above the 'upper cutoff'?
The result is a horn with extended bandwidth, it now plays from both the sides from 30Hz to 120 Hz and only from the front side much higher in
frequency, thereby extending bandwidth.
Pls see the attached diagram for the design.
I would appreciate if somebody could help simulate the above concept with Tang Band W6-1139SIF. I am not well versed with HR hence the request.
https://www.parts-express.com/Tang-Band-W6-1139SIF-6-1-2-Paper-Cone-Subwoofer-Speaker-264-919.
It means building a horn from 30Hz to 120Hz and then adjust the acoustic LP to around 120Hz by trial and error to get best response possible.
Thanks in advance,
Wonderfulaudio
A tapped horn has a limited bandwidth: about 2 octaves, lets say from 30Hz to 120Hz the upper cutoff.
Beyond the 'upper cutoff' of the horn, it becomes too big and there is comb filtering sort of response higher up,
the delay of the rear wave of the horn is just too much for the ever increasingly smaller wavelengths.
What if the the rear is band limited, ie acoustically low pass the rear so that it stays muted above the 'upper cutoff'?
The result is a horn with extended bandwidth, it now plays from both the sides from 30Hz to 120 Hz and only from the front side much higher in
frequency, thereby extending bandwidth.
I would appreciate if somebody could help simulate the above concept with Tang Band W6-1139SIF. I am not well versed with HR hence the request.
https://www.parts-express.com/Tang-Band-W6-1139SIF-6-1-2-Paper-Cone-Subwoofer-Speaker-264-919.
It means building a horn from 30Hz to 120Hz and then adjust the acoustic LP to around 120Hz by trial and error to get best response possible.
Thanks in advance,
Wonderfulaudio
Last edited:
AKABAK could be used to model this. Your port will be very restrictive and likely limit useful output capability of the system.
The port is tuned very high and I guess need to be very short and large dia. Being large dia it will not be much restrictive
Hmm, just a quick response to show in HR how we get wider BW tapped pipes, horns. Offset Driver Tapped TL (ODTTL) simmed, though of course can be expanded (horn) or inverse tapered (TQWT).
I did something similar with my "dogfood duct" mod to my POC1 TH. It extended the passband a bit. It is still a bandpass enclosure though, so while it might measure better, its usable passband will still be limited.
