Tuning a Speaker cabinet

gjeff80 · 3rd August 2010, 07:41 PM

I have a quick question.. I have a folder horn W Bin cabinet that I am going to load with a JBL 2241 woofer, the Fs value of the woofer is 35Hz, should I aim to tune the ports in my box to 35Hz or is it acceptable to tune the ports to 40Hz as well/ i'm just not sure if the Fs value of the woofer has to match that of the cabinet.

Thanks
Glenn

sreten · 3rd August 2010, 08:17 PM

Quote:

Originally Posted by gjeff80

I have a quick question.. I have a folder horn W Bin cabinet that I am going to load with a JBL 2241 woofer, the Fs value of the woofer is 35Hz, should I aim to tune the ports in my box to 35Hz or is it acceptable to tune the ports to 40Hz as well/ i'm just not sure if the Fs value of the woofer has to match that of the cabinet.

Thanks
Glenn

Hi.

Port tuning is related to the drivers resonance in the box, not free air, in box
its always higher, you need to know Vas, Fs, QTS and Vbox for the proper value.

Having said that just tuning to 40Hz is not a terrible idea, low tunings are
actually quite flexible regarding boxes, unlike optimum higher frequency ones.

/Sreten.

gjeff80 · 4th August 2010, 07:19 PM

My question is, the JBL 2241H woofer I am putting in these cabinets has a Fs value of 35Hz on the T/S specs. Now I'm not sure should I tune the speaker box to this value as well?

sreten · 4th August 2010, 08:21 PM

Hi, No, that is simply not the way it works as I said,

/Sreten.

electroaudio · 4th August 2010, 08:25 PM

Thats a folded horn and horns are complicated, so get Hornresp (Download) and enter all the data.
Then you can see both the frequencyresponse and the excursion, to see what tuning gives the best compromise for your box+speaker combination.

3rd August 2010, 07:41 PM	#1
gjeff80 diyAudio Member Join Date: Dec 2003 Location: MA	Tuning a Speaker cabinet I have a quick question.. I have a folder horn W Bin cabinet that I am going to load with a JBL 2241 woofer, the Fs value of the woofer is 35Hz, should I aim to tune the ports in my box to 35Hz or is it acceptable to tune the ports to 40Hz as well/ i'm just not sure if the Fs value of the woofer has to match that of the cabinet. Thanks Glenn

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4th August 2010, 07:19 PM	#3
gjeff80 diyAudio Member Join Date: Dec 2003 Location: MA	My question is, the JBL 2241H woofer I am putting in these cabinets has a Fs value of 35Hz on the T/S specs. Now I'm not sure should I tune the speaker box to this value as well?

4th August 2010, 08:21 PM	#4
sreten diyAudio Member Join Date: Nov 2003 Location: Brighton UK	Hi, No, that is simply not the way it works as I said, /Sreten.

4th August 2010, 08:25 PM	#5
electroaudio diyAudio Member Join Date: Mar 2004 Location: stockholm	Thats a folded horn and horns are complicated, so get Hornresp (Download) and enter all the data. Then you can see both the frequencyresponse and the excursion, to see what tuning gives the best compromise for your box+speaker combination.

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