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Speaker Asylum: You're kidding, right? by E-Stat

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You're kidding, right?

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Your original statement: Including another octave at the bottom and the 20k extension you mention.

Another octave below 60 hz is 30 hz. You doubt that is attainable with a pair of 2200 square inch stats? You may choose to not accept that which is easily done. Likewise, there are numerous planars that easily achieve 20k.

You said that the bass capability is equivalent to some 60 - 15 inch woofers. Square inches maybe. Cubic, no.

"Capability" is your word not mine. I referred to surface area in context with the Majestic array. That's how the math works. The surface area of a 15" driver is about 177 square inches. What else is there for expressing the surface area of a driver other than square inches? Cubic displacement of what?

I was insinuating that you may have come up with your own correction curve

Assuming (incorrectly) rather than asking. Whatever. I found them on another website where curves were generated for the three different generations of the Radio Shack SPL meter.

Correction Curves

Scroll down for DMF's curves for the "Current digital meter" which is more accurate at the bottom than earlier versions. Note that one must ADD to the recorded figure for the correction. The RS unit understates low bass output, not overstates.

The curved driver surface was designed to offset high frequency beaming.

Actually, the driver surface is NOT curved. Each facet has a flat profile. It is the fact there are seven facets angled differently that opens up the dispersion to 90 degrees. Off axis you are directly facing one of those seven facets.

Hey, if you do get a true 20 Hz out of them, you are very lucky. Or fibbing.

You're confused again. I never mentioned the 20 hz performance. It is 10 db down over 30 hz. The U-1 response in my room is flat down to 25 hz (actually with a bit of a rise). Below that, the response rolls off considerably.

rw


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Topic - Please excuse my trivial question on speakers design. - beppe61 02:58:16 02/1/07 ( 74)