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2x10 cabinet size [message #41222]

Sun, 04 May 2003 20:11

little.h
Messages: 3
Registered: May 2009

Esquire

I'm looking for some help with sizing a 2x10 cabinet loaded with Eminence Alpha 10's. The woodworking will be no problem, but I'm rather confused with all the different software available to determine the cabinet and port sizes. If someone could pount me in the direction of the simplest program for a novice I would appreciate it.

Thanks!
Stephen

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Re: 2x10 cabinet size [message #41223 is a reply to message #41222]

Sun, 04 May 2003 20:35

Wayne Parham
Messages: 18695
Registered: January 2001

Illuminati (33rd Degree)

I encourage you to download and use PiAlign and BoxPlot. You'll find those Alpha 10's work pretty well in 1.5ft3 to 5ft3 cabinets tuned to 40Hz.

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Re: 2x10 cabinet size [message #41226 is a reply to message #41223]

Mon, 05 May 2003 07:49

little.h
Messages: 3
Registered: May 2009

Esquire

Thanks Wayne! I'll give those two a try. I think the most confusing aspect is tuning the box. What determines the frequency that you are aiming for?

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Re: 2x10 cabinet size [message #41228 is a reply to message #41226]

Mon, 05 May 2003 12:08

Wayne Parham
Messages: 18695
Registered: January 2001

Illuminati (33rd Degree)

The 40Hz recommendation for the cabinet is one that assures flat response for the system. As far as cabinet size is concerned, the larger you go the deeper your lowest bass notes will be. At 1.5ft3, your cutoff is around 60Hz and at 5ft3, it's 35Hz. Any larger or smaller and the cabinet becomes underdamped at this Helmholtz frequency, so you'll notice a peak in response.

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Re: 2x10 cabinet size [message #41231 is a reply to message #41228]

Mon, 05 May 2003 19:03

little.h
Messages: 3
Registered: May 2009

Esquire

First, thank you so much for your help Wayne. Second, should port diameter and length be adjusted based in the size of the cabinet? Or can I use the calculated measurements for any size cab?

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Helmholtz formula [message #41232 is a reply to message #41231]

Mon, 05 May 2003 22:39

Wayne Parham
Messages: 18695
Registered: January 2001

Illuminati (33rd Degree)

The Helmholtz frequency is determined by the following formulas:

So as you can see from the formulas, if you change the cabinet volume (Ve) and still want the resonant frequency to stay the same, you'll need to change port dimensions.

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