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Old 2nd December 2012, 04:21 PM   #261
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by cochleus View Post
If I were to try one it would be the Tang Band W2-803SM
I was eyeing the same thing, pity how it costs more than TC9FD which probably outperforms it. But if smaller size is what you want....
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Old 2nd December 2012, 04:25 PM   #262
iko is offline iko  Canada
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Quote:
Originally Posted by xrk971 View Post
To calculate the lowest fundamental 1/4 wave freq, divide speed of sound (about 342 m/s) by 4 x the path length of the longest channel in meters. For example, for a 1.5 m path, 342/6=57Hz. Use current design but modify by putting bigger central box for speaker chamber, this will only add 4 in to your overall dimensions, but the depth still has to be like 9 or 10 inches to let the driver have enough room to breathe.
Is multiplication by 4 because there are four channels?
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Old 2nd December 2012, 04:34 PM   #263
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Quote:
Originally Posted by ikoflexer View Post
Is multiplication by 4 because there are four channels?
No. It is because it is a quarter-wave length that is supported by the length. Read up on it at Quarter Wavelength Loudspeaker Design.
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Old 2nd December 2012, 04:56 PM   #264
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Thanks!

Something that might be worrisome is that Cal reports recessed vocals and this guy reports that the bass "ate" the middle frequencies. Coincidence?

seb:diy:audio: Cornu Spiral Copy Horn
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Old 2nd December 2012, 05:32 PM   #265
xrk971 is offline xrk971  United States
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Quote:
Originally Posted by ikoflexer View Post
Thanks!

Something that might be worrisome is that Cal reports recessed vocals and this guy reports that the bass "ate" the middle frequencies. Coincidence?

seb:diy:audio: Cornu Spiral Copy Horn
Easy fix with more stuffing, or use smaller drivers like I did (3.5 inch) and it is well balanced to my ears. The 8 incher would be beau coup bass.
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Old 2nd December 2012, 05:34 PM   #266
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SWMBO has me busy at the moment bit when I get a chance I will move them and report back. They really are located where the bass is augmented so I am hoping. Right now they sound a lot like a wide range in need of a tweeter, crossed low I might add, instead of a full range.
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Old 2nd December 2012, 05:36 PM   #267
xrk971 is offline xrk971  United States
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Are FE108's known for their crisp high end?
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Old 2nd December 2012, 05:42 PM   #268
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I'll save you a lot of reading and excerpt from Iko's link.
<start>
So how do they sound ? Well, my first reaction was that of sheer amazement at the amount of bass they produced. And i mean *a lot*. So much so, that i felt it ate the middle frequency. Some low stuff indeed.
<snip>
All in all, the sound is starting to change already (after some 20 hours of listening), and the bass is becoming more controlled.
<snip>
The mids are still lacking in some type of music, but there are others where everything is *spot on*.
<snip>
in general, i'm enchanted. And the sheer beauty of them leaves me contemplating each time i look at their direction.
<end>

I have to agree but I haven't had time enough to judge properly.
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Old 2nd December 2012, 05:44 PM   #269
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Well then... on my way to home depot for some plywood. I'm very tempted to go 4x4 ft each face for ease of construction. That'd be two sheets of 4x8. They can cut the plywood in store for me so all I'd have to do is cut the hole for speaker and start gluing. What do you guys think? Also, 1/4 in think or 3/8, or doesn't matter?
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Old 2nd December 2012, 06:23 PM   #270
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I'm in home depot. There's this sureply, already cut 4x4 at 1/4 in. $11 a sheet. Is it too thin perhaps?
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