pi corner horn [message #43635] |
Tue, 13 January 2004 06:55 |
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 #43642 is a reply to message #43640] |
Tue, 13 January 2004 11:03 |
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 |
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 #43678 is a reply to message #43645] |
Thu, 15 January 2004 16:55 |
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 mmNominal 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 |
|
Wayne Parham
Messages: 18791 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 |
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
|
|
|
|