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Tapped Horn vs. 6th Order Bandpass (series)
Tapped Horn vs. 6th Order Bandpass (series)
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Old 29th July 2019, 04:59 AM   #1
Brian Steele is offline Brian Steele  Grenada
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Default Tapped Horn vs. 6th Order Bandpass (series)

I remember reading somewhere that a tapped horn was a "6th order bandpass subwoofer taken to its logical limits". So I took a 6th order BP (series-tuned) sim and adjusted it to look like a tapped pipe (constant CSA from beginning to end, including the chambers), and the response did look like an equivalent tapped pipe sim using the same driver.

I subsequently reduced the csas for the vents and adjusted the chambers in the sim, and I ended up with a 6th order BP sim with basically the same usable passband - in a box that was less than half the volume of the TH. Hmm....

Of course the sim does not include the effect of losses, and it's likely that the difference would be a bit more than pictured in the graph, but we're talking about similar response in half the box size.

So why are 6th order series-tuned BP boxes not more popular?
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File Type: png 20190728-TH vs 6BPS.png (88.8 KB, 227 views)
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Old 29th July 2019, 08:42 AM   #2
Circlomanen is online now Circlomanen  Sweden
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Quote:
So why are 6th order series-tuned BP boxes not more popular?
Helmholtz might look nice in simulation but sounds horrible compared to quarter wave.
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Old 29th July 2019, 08:50 AM   #3
Circlomanen is online now Circlomanen  Sweden
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I was recently forced against my will to build a 6th order HH based BP, and this is what I designed.

Click the image to open in full size.

Click the image to open in full size.

Click the image to open in full size.

The positive acoustic-mechanic feedback mechanism and the large cross section port makes for a great midbass punch - otherwise seldom heard in 6th order HH BP.
The sound quality does not come close to a QW-based high order BP - even with with the positive feedback and the large cross section port.
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Old 29th July 2019, 08:52 AM   #4
pelanj is online now pelanj  Czech Republic
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Interesting stuff. I am slowly considering optimizing my "home PA" system. I am aiming for as high efficiency as possible down to 40 Hz and as small as possible with pro drivers. I considered some kind of TH, but this looks even better.
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Old 29th July 2019, 09:24 AM   #5
chris661 is offline chris661  United Kingdom
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While the frequency response is similar, how does excursion compare?

Chris
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Old 29th July 2019, 12:38 PM   #6
LORDSANSUI is offline LORDSANSUI  Brazil
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and group delay
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Old 29th July 2019, 11:05 PM   #7
Brian Steele is offline Brian Steele  Grenada
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Quote:
Originally Posted by Circlomanen View Post
The sound quality does not come close to a QW-based high order BP - even with with the positive feedback and the large cross section port.
With that precipitously steep drop-off at the low end and ringing around the lowest frequency in the passband, I can quite understand why that particular alignment would sound horrible. GD must be awful...

With the sims I illustrated, GD in the passband is very similar between the BP and TH sims. In fact, the GD looks better for the BP sim at higher bass frequencies.
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File Type: png 20190729-POC10-6BPS.png (44.7 KB, 155 views)
File Type: png 20190729-POC10-TH.png (43.2 KB, 23 views)
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Old 29th July 2019, 11:07 PM   #8
Brian Steele is offline Brian Steele  Grenada
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Quote:
Originally Posted by chris661 View Post
While the frequency response is similar, how does excursion compare?

Chris
I didn't notice any significant difference in excursion between the two sims.
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Old 30th July 2019, 03:13 AM   #9
LORDSANSUI is offline LORDSANSUI  Brazil
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GD looks better for green one, and take into account post #1 it's indexed to TH while red one is BP, did you inverted the graphics or the analysis?

Other then being half-size, for sure the BP construction will be a lot easier then TH, mainly if you just use rectangular vents.

Are you planing to compare them in real life?
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Old 30th July 2019, 03:36 AM   #10
Brian Steele is offline Brian Steele  Grenada
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Quote:
Originally Posted by LORDSANSUI View Post
GD looks better for green one, and take into account post #1 it's indexed to TH while red one is BP, did you inverted the graphics or the analysis?
The green graph is the GD for the 6th order BP sub . And yes, I did invert them.

I probably won't build these, at least not in a hurry. Real work's taking up too much of my time these days...
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