small(15l) vented bipole with fe127e, possible?

Brytnardz · 28th May 2008, 12:06 PM

I have this set in mind, to make a mono speaker using the fe127e in a 15l vented bi-pole configuration.

I have read Salas post "TB3 mini bi-pole" as inspiration and it all seems very good to me.

If possible I intend to use this speaker as a portable backpack speaker, so a low weight ratsio and size is of importance.

I have searched this forum for a while now and have not come up with an answer.

please can you help confirm me if I have jumped in the "crazy barrel"?

Brytnardz · 29th May 2008, 11:41 AM

ok ,I know now that it is not possible, so forget this post.
the moderator may take it away......

kifeinthesink · 1st June 2008, 04:00 AM

i dont know anything about this project or the designer but it appears to be what you were looking for.

FOSTEX FE127E SEALED BIPOLE DESIGN

Figure 01 shows the calculated frequency response. For two FE127E drivers, the optimum volume is about 12L

http://diyaudioprojects.com/Speakers.../FE127E_SB.htm

gmilitano · 2nd June 2008, 01:33 PM

Quote:

Originally posted by kifeinthesink
Figure 01 shows the calculated frequency response. For two FE127E drivers, the optimum volume is about 12L

http://diyaudioprojects.com/Speakers.../FE127E_SB.htm

I should update the text on that project page. 12L is the optimum sealed volume using the Factory supplied T/S parameters. Using the measured parameters, the optimum volume is about 23L.

FYI - Here are my measured T/S parameters for the
Fostex FE127E Fullrange drivers. Also, take a look at this thread about the FE127E T/S parameters.

On the graph, the orange line is the modeled response using the Fostex parameters and the yellow line using the measured parameters.

Brytnardz · 8th June 2008, 06:58 AM

Thanks alot for the replys. This have been most helpful and interesting.

28th May 2008, 12:06 PM	#1
Brytnardz diyAudio Member Join Date: Oct 2007	small(15l) vented bipole with fe127e, possible? I have this set in mind, to make a mono speaker using the fe127e in a 15l vented bi-pole configuration. I have read Salas post "TB3 mini bi-pole" as inspiration and it all seems very good to me. If possible I intend to use this speaker as a portable backpack speaker, so a low weight ratsio and size is of importance. I have searched this forum for a while now and have not come up with an answer. please can you help confirm me if I have jumped in the "crazy barrel"?

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29th May 2008, 11:41 AM	#2
Brytnardz diyAudio Member Join Date: Oct 2007	ok ,I know now that it is not possible, so forget this post. the moderator may take it away......

1st June 2008, 04:00 AM	#3
kifeinthesink diyAudio Member Join Date: Oct 2005 Location: Guelph, Ontario	i dont know anything about this project or the designer but it appears to be what you were looking for. FOSTEX FE127E SEALED BIPOLE DESIGN Figure 01 shows the calculated frequency response. For two FE127E drivers, the optimum volume is about 12L http://diyaudioprojects.com/Speakers.../FE127E_SB.htm

8th June 2008, 06:58 AM	#5
Brytnardz diyAudio Member Join Date: Oct 2007	Thanks alot for the replys. This have been most helpful and interesting.

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