Those screenshots are from this link.
https://www.avsforum.com/threads/th...94240/page-287?post_id=63568245#post-63568245
https://www.avsforum.com/threads/th...94240/page-287?post_id=63568245#post-63568245
I cut a big access hole on the high tuned side of my 6bp. It’s still too ‘small’ to eliminate it though…. I wish I couldve built that entire section without inevitable dealing with leaks all over the high pressure end
I definitely feel like I can relate to these electrical’ and ‘impact’ comments.. @Circlomanen has similar observations I’ve enjoyed his enthusiasm while reading about high order qw as well
But in the ‘paraflex’like things I Mess with the Fb is so ‘overdamped’ I don’t think I’m a fan. Meanwhile, if you don’t use a qw pipe on the low tuned side you cannot capitalize on the 3:1 resonator tunings and incredible SPL created by the shared harmonic.
Devastater uses a low tuned perky Helmholtz Fb and a really high tuned qw pipe in the other section. Maybe that needs to be tuned closer to the Fb to really create a monster (like the 2:1 used in the roar (but with a perky Helmholtz resonatur for the low tuned side?
But in the ‘paraflex’like things I Mess with the Fb is so ‘overdamped’ I don’t think I’m a fan. Meanwhile, if you don’t use a qw pipe on the low tuned side you cannot capitalize on the 3:1 resonator tunings and incredible SPL created by the shared harmonic.
Devastater uses a low tuned perky Helmholtz Fb and a really high tuned qw pipe in the other section. Maybe that needs to be tuned closer to the Fb to really create a monster (like the 2:1 used in the roar (but with a perky Helmholtz resonatur for the low tuned side?
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I might be WRONG in my A$$umption that qw pipes are more damped than an equivalent size, tuned and vent exit Helmholtz resonator?
No. He just attached an external chamber. The leftside port is the horn. The rightside port is the BR enclosure port. You could basically turn any existing BR enclosure into a BP6P. You could even cover up the whole BR enclosure and make a BP6S enclosure.
The purpose of a Devastator is to gain midbass. Flat response 2pi BP's become "1 note wonders" when you add room or cabin gain. That's why you want a rising response to the low pass filter frequency.
All of my car audio BP4's are designed to have a flat response at 0.5pi...gain midbass.
I'm actually modeling BP4 enclosures now for a single Lanzar VW15D in a 03-11 Lincoln Town Car since my son is getting my 2011 Ford Crown Victoria LX.
I'm actually modeling BP4 enclosures now for a single Lanzar VW15D in a 03-11 Lincoln Town Car since my son is getting my 2011 Ford Crown Victoria LX.
Folks make things complicated.
If you know the tuning frequency of the existing BR enclosure, then build a chamber that is tuned to at least 1 to 2 octaves higher. I would probably have the port size at least twice the CSA of the BR enclosure's port. You should get decent results with those guidelines.
I have stupid ideas about creating resonators that are related by length (and size) and tuning by ‘exactly’ 2:1. (Or a 1/4 wave harmonic).
They ‘work’ together ‘optimally’ but that’s probably just me overthinking things by studying what happens @ 3x Fb in parallel 1/4 wave resonators ?where the path is so long it begins to go out of phase (again) at full wavelegths ….
If you create things that line up ‘perfectly’(in horn response) to cancel, then you’re also lining up things to resonate, etc ? (In phase(180) out of phase (360) or at resonance?)
I dunno, seems Brian Steele used to try to create things with minimal out of band noise as well? Certainly seems to work well for my ears too
They ‘work’ together ‘optimally’ but that’s probably just me overthinking things by studying what happens @ 3x Fb in parallel 1/4 wave resonators ?where the path is so long it begins to go out of phase (again) at full wavelegths ….
If you create things that line up ‘perfectly’(in horn response) to cancel, then you’re also lining up things to resonate, etc ? (In phase(180) out of phase (360) or at resonance?)
I dunno, seems Brian Steele used to try to create things with minimal out of band noise as well? Certainly seems to work well for my ears too
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