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Old 30th December 2006, 01:27 PM   #431
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Quote:
Originally posted by tuscanasun
Tweaked FE126E in BR.

Very nicely done

Here's my 126e in Angular Spiral:

Click the image to open in full size.
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Old 30th December 2006, 05:17 PM   #432
halx00 is offline halx00  United Kingdom
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Here is my first attempt at loudspeaker building, I've used the CSS FR125s in a solid 25mm thick Iroko hardwood box, ported with a solid machined alu port.
I'am sure natural wood has a better sound than mdf.
These have replaced a pair of Dynaudio Contour 1.1s, in my opinion the midrange is in different league, do crossovers effect the sound that much?
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Old 30th December 2006, 05:21 PM   #433
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When it 1st came out, i did a speculative design for a small aperiodically loaded FR125. Here is a realization -- 4.5 liter aperiodically loaded CSS FR125S.

They work very well. The picures don't convey the color very well. The cherry veneer is probably closest to the picture from the front than the other 3.

dave
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Old 30th December 2006, 05:28 PM   #434
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Quote:
Originally posted by halx00
do crossovers effect the sound that much?
Oh yes... XOs in general are evil

Here are the plans for the 4.5L boxes

dave
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Old 30th December 2006, 05:56 PM   #435
halx00 is offline halx00  United Kingdom
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Thanks for the plans, I have some Iroko left over and my daugther likes my frs' that much she wants some.

The slope on the rear? and holes near the bottom?
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Old 30th December 2006, 06:26 PM   #436
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The slope on the rear makes the 2 most critical opposite surfaces quite non-parallel (parallel walls in a box this small could have some nasty consequences). The steep angle also gives a place to put the foam damping that makes the joles aperiodic (we struggled with a way of doing the ports easily and ended up lifting this configuaration from Bill Perkins PR-2s)

There are 20 - 1/4" holes

dave
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Old 31st December 2006, 12:05 AM   #437
Geoff H is offline Geoff H  Australia
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Dave, your design is also a great way of testing/comparing smaller w-range and mid-range drivers. In a multi-way system, possibly the best midrange enclosure going. We tried an internal panel to steer the reflected waves toward the lower corner. It was a waste of timber. The 60 deg seems optimum.

We found you could listen to the driver without any "box" additions to the sound.

And very high WAF.

Regards,
Geoff.
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Old 31st December 2006, 12:09 AM   #438
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Hi Dave,

Quote:
Originally posted by planet10
When it 1st came out, i did a speculative design for a small aperiodically loaded FR125. Here is a realization -- 4.5 liter aperiodically loaded CSS FR125S.

They work very well. The picures don't convey the color very well. The cherry veneer is probably closest to the picture from the front than the other 3.

dave
Nice!

What's your opinion of those for a MM or monitor pair?

Cheers!
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Old 31st December 2006, 12:30 AM   #439
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They are intended to be computer speakers.

dave
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Old 2nd January 2007, 06:26 PM   #440
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Default FR125 4.5l Aperiodic -- resistive port material

Hi, Dave -- very interesting, and thanks for posting the plans. What did you end up using for the resistive material in front of the aperiodic vent-holes?
Regards, John
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