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tuning the Alpha 10" [message #47483]

Tue, 16 August 2005 08:55

Black
Messages: 12
Registered: May 2009

Chancellor

i would like to tune a 4 cu ft box for the alpha 10" to 35 Hz, can anyone tell me the L & W of the port, i would prefer a rectangle port. i can't do the Calculation

thanks

zeno

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Re: tuning the Alpha 10" [message #47484 is a reply to message #47483]

Tue, 16 August 2005 09:56

Wayne Parham
Messages: 18787
Registered: January 2001

Illuminati (33rd Degree)

You can use a 4" diameter, 3½" long. There's a formula and simple program to calculate the Helmholtz frequency in the post called "Two Pi with off-sized speaker box."

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Re: tuning the Alpha 10" [message #47485 is a reply to message #47484]

Tue, 16 August 2005 10:07

Black
Messages: 12
Registered: May 2009

Chancellor

hi wayne, i intend to use the alpha 10" with a oris horn ( coral beta 6 fullrange driver ) do you have any suggestion on how to cross them?

zeno

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Re: tuning the Alpha 10" [message #47486 is a reply to message #47485]

Tue, 16 August 2005 10:32

Wayne Parham
Messages: 18787
Registered: January 2001

Illuminati (33rd Degree)

If I remember, the Oris horn can be used down to around 250Hz. If you crossover there, wavelegth is about 4½ feet long. I'd probably use a simple first-order filter, just a 6.0mH coil in series with the woofer. You can expect summing to be good if the woofer is placed directly underneath the Oris horn.

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that seem easy [message #47487 is a reply to message #47486]

Tue, 16 August 2005 10:33

Black
Messages: 12
Registered: May 2009

Chancellor

thanks wayne

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4 cu ft @ 35Hz. Isn't that a 2PI Tower? (nt) [message #47488 is a reply to message #47483]

Tue, 16 August 2005 14:28

GarMan
Messages: 960
Registered: May 2009

Illuminati (2nd Degree)

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Pretty close [message #47489 is a reply to message #47488]

Tue, 16 August 2005 15:11

Wayne Parham
Messages: 18787
Registered: January 2001

Illuminati (33rd Degree)

A two π tower is a little larger and tuned a little higher, but not much.

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Re: tuning the Alpha 10" [message #47496 is a reply to message #47483]

Wed, 17 August 2005 07:33

GarMan
Messages: 960
Registered: May 2009

Illuminati (2nd Degree)

Zeno, can I ask why you've elected to use the Alpha10? It is because you already have one lying around?

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Re: tuning the Alpha 10" [message #47498 is a reply to message #47496]

Wed, 17 August 2005 11:31

Black
Messages: 12
Registered: May 2009

Chancellor

thatis one of the reason, i can try any other but i am using a 2A3 amp

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Re: tuning the Alpha 10" [message #47499 is a reply to message #47498]

Wed, 17 August 2005 11:51

GarMan
Messages: 960
Registered: May 2009

Illuminati (2nd Degree)

I was going to suggest the Delta12LF that's used in the Theatre-3 and use that alignment. I found it to have tighter bass than the Alpha10 and allows for a smaller cabinet. However, the Alpha-10 is a much better choice if you're using a set of 2A3 amps. The "looseness" I found with the Alpha-10, when compared with the Delta12LF, may actually work in your favour when used with such a low-powered amp.

A set of Wayne's corner horns would work well in your case too. However, already having the driver in hand is a pretty good reason.

Gar.

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