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Old 25th November 2007, 04:46 PM   #1
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Default Fostex full range speaker help

Hello all,

I'm very new to DIY but have been into High'ish end audio for quite a few years.
I'm wanting to put together a little full range speaker for relatively near field listening. I have a pair of PartsExpress .25 cabinets that are gorgeous. http://www.partsexpress.com/pe/showd...number=302-707

I know they are on the small side and that's ok for now...I will be complimenting the low end with a sub, so I'm not too concerned with them being able to go much lower than say...80hz or maybe 120.

I'm looking at the Fostex FE167E or possibly the FE108E sigma 4'..or any other recommendations.
At some time I may add a Foxtex super tweeter If needed.

My question is regarding the port...as in how do I figure out size and length?
Any help or suggestions would be greatly appreciated.

Thanks

Mike
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Old 25th November 2007, 08:25 PM   #2
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Looks like FE127E will be the best choice for your .25cuft vented cabs. Unfortunately, they will need a bigger box to get below 150Hz.

To determine the port size/length, you will need some software. I've been using WinISD Alpha for a while, it's easy to use and you can add drivers to the database if they are not already there.

Jeff
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Old 25th November 2007, 08:26 PM   #3
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Greets!

Well, most folks just either use an on-line calculator or DL WinISD or similar freeware, input published specs and let the program figure it out, though some don't figure the minimum vent area required for low noise at whatever the rated power is. Anyway, if you plug different drivers in to see how they'll perform in a small cab you'll find that some are best vented and others sealed, with the 166E, 207E being good examples of each, while the 108ES and some others will require the cab's volume (Vb) be decreased.

GM
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Old 25th November 2007, 11:01 PM   #4
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Default Thanks

Thanks for all of your help, I just downloaded WinISD. It may take me a little to figure out the pretty colors.
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Old 26th November 2007, 01:27 AM   #5
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You're welcome!

FYI, WinISD has some vent calcing issues, so I recommend using the pro version and there's plenty of folks around here that can answer your Qs, if any.
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Old 26th November 2007, 03:30 AM   #6
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I saw some of those boxes last WE. They are nice, I've ordered a par of the 7 litre and the 21 litre (the latter the smallest suitable for FE167, the small ones for FR125). I was convinced the sides were 3/8" ply + 3/8" MDF but the PE guys insist they are all MDF -- could you check yours?

We are gonna toss the baffles they come with and make out own.

The best driver for that box is FE127. I'd have to refigure the porting... i have designs for 13 litre and 4.5 litre. The 4.5 litre gets to about 100 hz. the 7 litre box you have should be able to do better.

dave
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Old 26th November 2007, 03:48 AM   #7
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Those are nice looking boxes, aren't they. The 7 litre box tuned to 65Hz starts to fall off at approx. 120Hz, with f3 at about 80Hz. FR is up about 1/2db between 150-200Hz with this tuning BTW.

Jeff
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Old 26th November 2007, 08:15 PM   #8
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Default PE speaker box

Here are some pic's for the 7L PE box.
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File Type: jpg sl270358.jpgsmall.jpg (93.8 KB, 681 views)
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Old 26th November 2007, 08:15 PM   #9
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Default more pic's

Another pic
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Old 26th November 2007, 08:49 PM   #10
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Default Re: PE speaker box

Quote:
Originally posted by hifibuyguy
Here are some pic's for the 7L PE box.
The pic is a bit low rez to tell, but doesn't this blow up hint of the 1/2 ply, 1/2 MDF construction?

dave
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File Type: jpg cabinet-edge.jpg (33.7 KB, 662 views)
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