What do you think of this box design?

[ghart999 10+ year member]

What's the tuning frequency?

This is what Pete told me.

"This rear-loading folded horn will offer improved control over your woofers' excursion along the entire bandwidth of the operating range (which, by the way is 30Hz - 80Hz in-cabin.) You can also expect audible response well into the mid-20Hz range, however, I would suggest setting your subsonic filter around 30Hz because, below that frequency, your acoustic impedance is going to diminish rather rapidly. Overall, you'll notice improved power handling allowing you to push the woofers harder, plus smoother overall response with fewer peaks and dips. The woofers will still fire toward the rear with your choice of the horn mouth sitting either on the driver or the passenger side. If you'd like to concentrate more of the low-end extension along the driver side of the cabin, make sure that the mouth of the horn is on the passenger side and vice versa."

So I really don't know. LOL.

 

[bones22 5,000+ posts]

looks nice other than being a pain in the ass to build

 

[ghart999 10+ year member]

looks nice other than being a pain in the ass to build

Pain in the *** for SPY to build. LOL.

 

[ughhibye 10+ year member]

that is a exact duplicate of a box i just built for 2 tc 12's.

guess pete is just re using designs now. this isnt the first times

 

[bones22 5,000+ posts]

Pain in the *** for SPY to build. LOL.

SPY is a great guy

i know he wont **** you on price but im sure he will have to charge a little extra to do this one

 

[mobeious 10+ year member]

i think pete is a joke... got lucky on a couple boxes and made a name for his self ... iv known people that have had terrible box designs from him that hasnt worked and i know people that have had designed that worked... but all that crap with like 3.47" and 98.7 degrees is stupid i do give him some credit that his building skills are good but i think the whole idea of him being a box design god is a joke.. he claims to be a acoustical engineer.. if so why does he have a **** stereo shop and not working for a big Pro audio company

 

[ghart999 10+ year member]

i think pete is a joke... got lucky on a couple boxes and made a name for his self ... iv known people that have had terrible box designs from him that hasnt worked and i know people that have had designed that worked... but all that crap with like 3.47" and 98.7 degrees is stupid i do give him some credit that his building skills are good but i think the whole idea of him being a box design god is a joke.. he claims to be a acoustical engineer.. if so why does he have a **** stereo shop and not working for a big Pro audio company

Working for yourself > working for someone else.

 

[ghart999 10+ year member]

that is a exact duplicate of a box i just built for 2 tc 12's.
guess pete is just re using designs now. this isnt the first times

Do you mind posting your design from him? NOt doubting you. Just want to call him on it if this is the case.

 

[ughhibye 10+ year member]

Do you mind posting your design from him? NOt doubting you. Just want to call him on it if this is the case.

i will ask the customer that provided me with the design

 

[Trey803 5,000+ posts]

This is what Pete told me.
"This rear-loading folded horn will offer improved control over your woofers' excursion along the entire bandwidth of the operating range (which, by the way is 30Hz - 80Hz in-cabin.) You can also expect audible response well into the mid-20Hz range, however, I would suggest setting your subsonic filter around 30Hz because, below that frequency, your acoustic impedance is going to diminish rather rapidly. Overall, you'll notice improved power handling allowing you to push the woofers harder, plus smoother overall response with fewer peaks and dips. The woofers will still fire toward the rear with your choice of the horn mouth sitting either on the driver or the passenger side. If you'd like to concentrate more of the low-end extension along the driver side of the cabin, make sure that the mouth of the horn is on the passenger side and vice versa."

So I really don't know. LOL.

most of that is true of any ported box

 

[edzy 10+ year member]

dude, you should have atleast blacked out measurements on that. I know I would be pissed if that was my design and some forum lurker was Dling those pics right now....Cough....

 

[ghart999 10+ year member]

dude, you should have atleast blacked out measurements on that. I know I would be pissed if that was my design and some forum lurker was Dling those pics right now....Cough....

Why? The box is custom built for my subs with my measurements for my car based on my listening prefs. The box is not a generic plan that will work in all situations.

 

[mcsoul 10+ year member]

This is what Pete told me.
"This rear-loading folded horn will offer improved control over your woofers' excursion along the entire bandwidth of the operating range (which, by the way is 30Hz - 80Hz in-cabin.) You can also expect audible response well into the mid-20Hz range, however, I would suggest setting your subsonic filter around 30Hz because, below that frequency, your acoustic impedance is going to diminish rather rapidly. Overall, you'll notice improved power handling allowing you to push the woofers harder, plus smoother overall response with fewer peaks and dips. The woofers will still fire toward the rear with your choice of the horn mouth sitting either on the driver or the passenger side. If you'd like to concentrate more of the low-end extension along the driver side of the cabin, make sure that the mouth of the horn is on the passenger side and vice versa."

So I really don't know. LOL.

I'd have to guess and call that 32Hz //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

 

[ghart999 10+ year member]

31, 32, whatever it takes.

 

[Immacomputer 10+ year member]

I'd have to guess and call that 32Hz //content.invisioncic.com/y282845/emoticons/laugh.gif.48439b2acf2cfca21620f01e7f77d1e4.gif

The tuning frequency of a horn enclosure is different from the tuning frequency of a ported enclosure.

most of that is true of any ported box

Horn loading is far different from any ported enclosure. Horns have cone control over the pass band of the horn. Ported enclosures have cone control only around the tuning frequency of the enclosure.

While in the pass band (about 30-80hz), the subs will see a purely resistive acoustic impedance and so the subs will have better cone control than a ported enclosure with the same tuning frequency as the lower cutoff frequency for the horn. Horns will also not have as steep of a roll off as ported enclosures but the purely resistive acoustic impedance will soon turn complex which will change the phase of the mouth to shift relative to the phase of the throat.

The whole system is actually pretty compromised (acts more like an expanding transmission line) due to the non-ideal expansion of the cabin of the vehicle but it should still offer the resistive load to the drivers (a purely resistive acoustic impedance turns all of its consumed energy and can transfer it very effectively, something a ported enclosure does NOT do).

So please, if you're going to give Pete's designs a hard time, at least understand the theory behind the enclosure and why his designs might sometimes be considered compromised (but that doesn't mean they won't be effective).