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In Reply to: RE: THe only single driver systems I have heard that sounded really good posted by morricab on December 18, 2014 at 02:17:47
My Spectra 2200s were good from around 30Hz to 20Khz as were my 1+1s. Multiple panels but all working in parallel and over the full frequency range.
While the 1+1s are truly full range, the SPECTRA series is not. They attempted to address the beaming by electrically isolating the HF content to a narrow strip of one of the panels. No longer were all frequencies delivered by all of the panel area. They became effective two-way speakers.
Here is a description of the "half panel" approach by Acoustat engineer Andy Szabo :
"The resistors feeding the mids/lows and lows-only sectors create a time delay (as do all R-C filters), which effectively creates the curved dispersion: electrically curved instead of mechanically curved. Therefore, it makes sense that the full range sector is close to the the inner edge of each speaker, so that adjacent sectors are time-delayed (or curved away from the listener) for a smooth dispersion pattern.
If you didn't know, Spectra is an acronym for Symmetric Pair Electrically Curved TRansducer."
Follow Ups:
Come to think of it the Quad 63 is also a single driver speaker that is electrically segmented and so is the STAX ELS-F81 and F83 (two panels of the F81 per side).
Hi Brad!
I made a somewhat similar comment about Quad's being a single, but not " full-range " driver almost a week ago on 12/16 as seen below! IMHO more proper name for these types of drivers would be a single " wide-range " or " broadband " driver! In any event it's really nice to see that others, besides myself, realized these types of drivers weren't limited to just dynamic cone-type drivers! Those who really thought about this understood some ESLs, ribbons and planars were possible contenders in this category of drivers too!
I'm listening to: Suspended Night by Tomasz Stanko Quartet
Thetubeguy1954 (Tom Scata)
Central Florida Audio Society -- SETriodes Group -- Space Coast Audio Society
Full-range/Wide-range Drivers --- Front & Back-Loaded Horns --- High Sensitivity Speakers
Yeah, I don't know why people forget that there were (are) full range electrostats that are not based on multiple drivers.
THat said, they are not high sensitivity.
While the 1+1s are truly full range, the SPECTRA series is not. They attempted to address the beaming by electrically isolating the HF content to a narrow strip of one of the panels. No longer were all frequencies delivered by all of the panel area. They became effective two-way speakers.
I know this but it is STILL a single panel...not separate drivers...therefore it is still a single full range driver.
The driver that has the highs isolated also does the full range...the second panel does mids and bass only.
...therefore it is still a single full range driver.
Except of course when you listen to it nearfield.
No, this is not correct. The part of the speaker doing high frequencies is ALSO doing everything else...it is the rest of the panel that is not doing highs or mids.
it is the rest of the panel that is not doing highs or mids.
Not all of the panel area is running full range. There are no highs coming out of 75-80% of the panel area depending upon configuration.
Unlike designs that run truly full range across 100% of panel area, that requires some distance for optimum blending.
No, but the area where there are highs is running full range.
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