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help: pi alignmemt for JBL E155 (box & port) [message #43252] Wed, 03 December 2003 07:53 Go to next message
xsheya@yahoo.com is currently offline  xsheya@yahoo.com
Messages: 4
Registered: May 2009
Esquire
Hi All,

I am new to the business. And need some helps from all you seniors:
I bought JBL 2402H, 2447J and E-155H for 4-pi 18 bass reflex
series. But I can not run Wayne's DOS progrm on my SUN workstation
to get the proper box volume and port size/length. Any one can help
me run the number, please? I am planning to active cross around 1kHz for 2447J and E-155H.

Thanks a lot!

Here is the spec for E-155H:
fs 30, qts 0.2, qms 2.2, qes 0.22, vas 424.8 lites, eff 4.9, pe 300w, Xmax 5.08mm, re 6 ohm, le 1.4 mH, sd 0.114 m*m, bl 25 N/A, m 125 g

Shau


Re: tune to 30Hz, if it possible (NT) [message #43253 is a reply to message #43252] Wed, 03 December 2003 07:58 Go to previous messageGo to next message
xsheya@yahoo.com is currently offline  xsheya@yahoo.com
Messages: 4
Registered: May 2009
Esquire
Hi again,

I forgot to mention: tune to 30Hz, if it is possible for E-155H?

Regards,

Shau

Re: help: pi alignmemt for JBL E155 (box & port) [message #43258 is a reply to message #43252] Wed, 03 December 2003 17:08 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18792
Registered: January 2001
Illuminati (33rd Degree)
PiAlign recommends a 3.0ft3 cabinet tuned to 56Hz using a port that's 5.25" x 9.375" and 7.25" long. Performance is very good using this cabinet. I wouldn't recommend tuning at 30Hz unless the cabinet were made much larger - around 8ft3 - in which case you will have generated an EBS alignment. Trouble is that this will reduce output below 100Hz -6dB.

The PiAligned 3ft3 56Hz cabinet provides flat response with f3 of 60Hz. The 8ft3 30Hz EBS alignment is -6dB down below 100Hz, but stays at this level down to 30Hz and the shelf is flat. Both are pretty good solutions, depending on your application.

Re: help: pi alignmemt for JBL E155 (box & port) [message #43261 is a reply to message #43258] Thu, 04 December 2003 07:01 Go to previous messageGo to next message
xsheya@yahoo.com is currently offline  xsheya@yahoo.com
Messages: 4
Registered: May 2009
Esquire
Thanks Wayne for the informative input!

Is that mean 2226J will out-perform E-155h around 40Hz? If so, I will go for 2226J instead of E-155h. The reason I bought E-155h is that it is 18" with lower fs(30Hz vs. 40Hz of 2226J).

Best Regards,

Shau


Re: help: pi alignmemt for JBL E155 (box & port) [message #43264 is a reply to message #43261] Thu, 04 December 2003 16:15 Go to previous messageGo to next message
Wayne Parham is currently offline  Wayne Parham
Messages: 18792
Registered: January 2001
Illuminati (33rd Degree)
These drivers are really tuned for high-output output above 40Hz. They can be used below this frequency, but they aren't designed with specs that make them well-suited for operation in the 20Hz - 40Hz octave. Looks for drivers with more moving mass and a little bit higher Q.
Re: Thanks Wayne!! [message #43268 is a reply to message #43264] Fri, 05 December 2003 06:32 Go to previous message
xsheya@yahoo.com is currently offline  xsheya@yahoo.com
Messages: 4
Registered: May 2009
Esquire
NT
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