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NOA Speakers [message #50362] Sun, 03 December 2006 21:36 Go to next message
sotoole is currently offline  sotoole
Messages: 2
Registered: May 2009
Esquire
I have built speakers much like yours.
I use a 2in X-Stealth horn driver cd horn and an Eminence delta lite 12 in a bass reflex crossed over at 1.6k.
they quit making the Delta lite 12 and came out with a delta lite II it has no phase plug and needs a bigger box. I tried the delta lite 10's and they beamed like crazy without the phase plug.
do you know of a woofer that is close in spl and lf in ~ 2.5 cuft to the original Delta lite and what are your thughts in large speakers and beaming?
thanks in advance
Steve O


Re: NOA Speakers [message #50365 is a reply to message #50362] Sun, 03 December 2006 21:55 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18783
Registered: January 2001
Illuminati (33rd Degree)

I don't care much for the Deltalites. They just didn't work out for me. The upper response was poor, so they were unusable above 1kHz or so, even the little 10" driver. My suggestion is to try the other lines instead.


Re: NOA Speakers [message #50369 is a reply to message #50365] Wed, 06 December 2006 12:47 Go to previous messageGo to next message
sotoole is currently offline  sotoole
Messages: 2
Registered: May 2009
Esquire
Yes the new 10's were awefull.
I am looking at the RFC LF12G300 but they are very expensive comaritivly.

What have you read on beaming ie.. speaker size related to frequency and could you direct me to that info?
thanks in advance
steve O



Re: NOA Speakers [message #50372 is a reply to message #50369] Wed, 06 December 2006 13:07 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18783
Registered: January 2001
Illuminati (33rd Degree)

Direct radiators begin to narrow directivity as a function of wavelength. See Chapter 3 of the JBL Sound System Design Reference Manual.


Re: NOA Speakers [message #50376 is a reply to message #50372] Sat, 09 December 2006 21:34 Go to previous message
mollecon is currently offline  mollecon
Messages: 203
Registered: May 2009
Master
Basically, a driver will start beaming at the frequency, where ½ a wavelenght is similar to the diameter of the driver.

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