von schweikert unifield 3, an offshoot from "fullranger with helper woofer"

[Scottmoose]

Well, if one takes a gander at the Fletcher-Munson / Equal Loundess curve, we see a rapid diminishing of our hearing accuity with rising frequency over about 8Khz or so, the most significant band being approx. 200Hz - 4KHz. So while nominally not perfect, within reason, you can get away with things that you couldn't in our acute hearing BW. Ditto for the LF.

[atarashi]

Well, i found out, that i like a small Fullrange driver, like the FX120, and a Woofer more than a large Fullranger and a Tweeter.
But i think it really comes down to personal preference.

Either way, you most likely don't have a crossover in the critical midrange...

Michael

[d to the g]

I'll be able to compare small full + helper woofer vs a large full + helper tweeter in the short term. A 126 with some 8" woofers from Jack Hidley vs a Pioneer B20 with Dayton tweeter. Hopefully that should give me a better idea of what I want to do for more ambitious projects in the future. I wish I could say more from experience, but for now I'll just sit back and learn.

[bobgroger]

So the cabinets appear by eyeball to be the .25cf on top, and the 1.0cf on bottom. Total of ~$450 for cabinets. Anyone have the cojones to walk in to a dealer with a tape measure? Cabinets weigh ~85lb so to meet specs drivers, crossovers, stands, and lead shot would be another ~105 Lbs. The web site says "Only the entry level speakers (this certainly would be one at "only" $15k\pr) are made in China". Specs may point to Seas W18E or W18EX woofer. The mid is said by some to be a "Ceramic compound" but yes, it looks identical to the Fostex FX-120. This looks like a very interesting project......

Bob G.

[planet10]

Originally posted by bobgroger
The mid is said by some to be a "Ceramic compound" but yes, it looks identical to the Fostex FX-120.

It is a Fostex FX120. The coating that comes on the Kenaf cone could well be a paint on ceramic compound similar to what Totem uses on the inside of their boxes.

If one looks at the mid cabinets in the review of theBESL speaker in this months affordable audio, they also have the outward apperance of the rectamgular PE cabinet.

The PE cabinets do not satisfy the levels of performance i'd consider adequate for even a budget speaker. One could rework them, but it would be easier to start from scratch. the curved back cabinets are another matter.

dave

[sreten]

Hi,

Badge engineering or badge BS ? you decide ....

88dB/W .... 91DB in room ..... -3dB @ 25Hz

A lot easier to make up than actually build.

To work correctly with those sort of numbers would require bi-amping,
with a lot more juice on the bass end, ideally with active crossovers.

The "time aligment" is fairly meaningless at the bass/mid c/o point.

With the apparent drivers it would make an interesting project,
but a single amplifier passive system would be compromised.

The 25Hz - 3dB point is pure fantasy even at the bass units real
bass sensitivity of ~ 85dB in any sensible box, never mind the
somewhat restricted 1cuft bass section, a 8" needs more.

/sreten.