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pi corner horn [message #43635] Tue, 13 January 2004 06:55 Go to next message
David Morrison is currently offline  David Morrison
Messages: 16
Registered: May 2009
Chancellor
could some one explain the general idea of this box.

And what kind is it port,horn, or a hybrid.

I am just trying to understand how they work

or if possible could a get some kind of a horn design for either a single 8,10,12. For learning purposes

dkmst23@yahoo.com

Thank you
David Morrison

Re: pi corner horn [message #43640 is a reply to message #43635] Tue, 13 January 2004 09:33 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18680
Registered: January 2001
Illuminati (33rd Degree)
A π cornerhorn is a design that uses a room corner as a very large horn. The room's corner expansion is purely conical for the first eight feet, and the expansion then becomes parabolic. The transition from conical to parabolic happens when the ceiling is taken into consideration, so this eight foot figure is taken from ceiling height. There is a little more on this in the post called "Room corner characteristics."

Other cornerhorn designs have folds that make a narrow throat within the cabinet, and a final flare that is formed by the rooms corner. The π cornerhorn design is very simple. The horn is deleoped solely from the room corner, and there are no folds within the cabinet. This provides a conical horn and provides directional eighth-space advantage. It is a simple design that works very well.

Re: pi corner horn [message #43642 is a reply to message #43640] Tue, 13 January 2004 11:03 Go to previous messageGo to next message
Dean Kukral is currently offline  Dean Kukral
Messages: 177
Registered: May 2009
Master
If I get this correct, then:

This design permits you to use a higher crossover than with a Klipsch-type folded corner horn, doesn't it? Thus, you are able to use a two-way system with full compression horn loading above the woofer? (Avoiding the need of the "Holy Grail" midrange.)

Re: pi corner horn [message #43643 is a reply to message #43640] Tue, 13 January 2004 11:14 Go to previous messageGo to next message
David Morrison is currently offline  David Morrison
Messages: 16
Registered: May 2009
Chancellor
when i used the formula on the pi align paper it told me to use a box of .36 cu ft the sub i have right now is in 4.5 cu ft vented with 67.5 sqaure inches of port. Can the corner horn be applied to any box volume for a sub. Becuase i doubt the cone will even move in that small of an enclosure.



Re: pi corner horn [message #43645 is a reply to message #43643] Tue, 13 January 2004 15:43 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18680
Registered: January 2001
Illuminati (33rd Degree)
What woofer are you planning to use? What are its T/S specs?

Re: pi corner horn [message #43646 is a reply to message #43642] Tue, 13 January 2004 15:48 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18680
Registered: January 2001
Illuminati (33rd Degree)
The design does allow higher crossovers than folded horns, and the speaker sounds very good in a two-way configuration. Original plans were for a three-way design, and those are still pretty commonly built. But you would be surprised how good the two-way configuration works, and the WAF is great with a nice wood horn up top. A two-way version of the loudspeaker is very attractive having no exposed drivers, and it sounds nice too.

Re: pi corner horn [message #43678 is a reply to message #43645] Thu, 15 January 2004 16:55 Go to previous messageGo to next message
David Morrison is currently offline  David Morrison
Messages: 16
Registered: May 2009
Chancellor
Model
9512e

Woofer Diameter
12"
Voice Coil Diameter
3"
Voice Coil Type
4 layer DVC

Magnet Weight
300 oz

Cone Type
Synthetic Fiber Blend

Power Handling RMS
1200

Power Handling Music
2500

Suspension
75 mm

X-max
29 mm

Nominal Impedance
Dual 2,Ohm

DC Resistance
1.9 Ohm

Free Air Resonance
34 Hz

Qts
0.31

Qes
0.33

Qms
4.15

Vas
35 L

Le mH
.9

Sensitivity
89 dB

Mounting Depth
7.25"

Cut Out Diameter
11 1/16"

Speaker Weight
44



Re: pi corner horn [message #43680 is a reply to message #43678] Thu, 15 January 2004 17:49 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18680
Registered: January 2001
Illuminati (33rd Degree)
PiAlign suggests a 0.38ft3 cabinet tuned to 41Hz. That is a very small cabinet, and it is sometimes difficult to pack everything inside a motor chamber that's this tight. Especially in this case, with the motor extending almost 8" inside the cabinet.

Performance from this cabinet is excellent, with a nice flat response curve. Really, you can use any box size between 0.4ft3
and 0.8ft3 tuned to 40Hz, and response remains nice and flat. If you get much above 0.8ft3, the system becomes underdamped and peaky. But you can employ an EBS alignment using cabinets between 1.0ft3 and 1.5ft3 tuned to 30Hz. This gives extended, deep response with a fairly shallow shelf of only 3dB reduction. That's a pretty good solution.

If your cabinet is much larger than that, it really should be sealed. There are many that prefer a sealed box, and if that is what you like, then a large box is acceptable. But f3 is way up there at around 100Hz, so I don't really like this approach. Then again, rolloff is slow and gradual, so it isn't like you are absent of bass or anything like that. Still, I'd run this speaker in a ported box between 0.4ft3 and 1.5ft3, tuned in one of the ways described above.

At any rate, once you've chosen a motor chamber size, then you can make a π cornerhorn based on those dimensions. I gerenally prefer motor chamber alignments that are critically damped to slightly overdamped for this configuration. EBS alignments are acceptable, as are other slightly peaked (underdamped) alignments, but as you might expect, they'll increase punch at the peaked frequency. This is sometimes pleasant, sometimes not. But the π cornerhorn configuration is generally pretty forgiving, so as long as your woofer/cabinet system is well formed and sounds good, then your cornerhorn will sound good too.

Re: pi corner horn [message #43689 is a reply to message #43680] Fri, 16 January 2004 09:32 Go to previous messageGo to next message
David Morrison is currently offline  David Morrison
Messages: 16
Registered: May 2009
Chancellor
The box it is in now sound good with good spl too.
However i do have another sub sitting a closet at home would this work better for the first try (rec box 1.0-1.75 cu ft)

it t-s parameter are below.

Diameter 10 in
Mag Weight 102 oz
Freq Range 30-200Hz
Nom Imp 2 x 4ohm
RE 2 x 2.10 ohm
Fs 30 Hz
Qts 0.41
Qes 0.44
Qms 6.32
SD 54 In^2
Vas .99ft^3 28 L
Cms 1.60E-04 m/N
Mms 6.09 0z
VC Diameter 3 In
VC 5 Mil Aluminum
VC Ind 2.10 mH
BL 12.6 Tm
Xmax 14 mm
SPL 85 dB
Power 500 W RMS/1000W Peak


Re: pi corner horn [message #43690 is a reply to message #43689] Fri, 16 January 2004 10:20 Go to previous messageGo to previous message
Wayne Parham is currently offline  Wayne Parham
Messages: 18680
Registered: January 2001
Illuminati (33rd Degree)
Your second subwoofer would work in a chamber between 0.4ft3 and 1.0ft3 tuned to 30Hz. For larger cabinets, up to 2.0ft3, tune the chamber to 25Hz for best results.

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