Posted by MARCOS AUGUSTO on October 05, 2002 at 21:57:36:
In Reply to: ESL .... ONE POINT SOUND ORIGIN Only an ESL can do it posted by Terry Koehn on October 05, 2002 at 09:43:24:
Hey again TERRY,
i was in no way "thinking in terms of cone/box" and i am fully aware that, when it comes to electrostatic speakers, the bigger they are the more deep bass they are capable of reproducing....(previous to my A-1's i owned two pairs of ACOUSTAT speakers, which, as wonderful as they sounded, were never capable of going any lower than 45Hz).
insofar as "when you add an ESL sub panel woofer you still let the U-1's operate at full range"...my understanding from the many postings i read concerning that beautiful picture, was that the owner of the "rig" uses an active electronic crossover set at 180Hz ; perhaps in my haste i misunderstood that the crossover has a high-pass filter set at 180Hz as well as a low-pass filter set, again, at 180Hz, thus enabling the U-1's to play only above that set number, as well as the ESL subwoofer to play audio frequencies below the same number (180Hz crossover point).
my main question on my original post was apparently answered by you, when you stated that "my SOUND LAB ESL sub bass panel extends from 28Hz to above audibility"...and, yet, from the original picture posted, it appears that the ESL sub uses the exact same spacing distance for each horizontal "sector" as the A-1 / M-1 / U-1 with the difference, as you pointed out, that "the ESL subs woofer panels may have higher bias voltage and more distance between diaphragm & stators".
one interesting point you made on your post was: "You don't want the violin octave runs to travel across 6' feet of ESL panel"....but isn't that exactly what happens when you play, say, the sound of a violin solo on an U-1 and such sound extends from 100Hz to 3KHz (plus the harmonics!), and the ENTIRE ESL panel responds to it by fully moving back and forth ???
and, since we are talking exclusively about SOUND LAB electrostatic panels, wouldn't the size of these panels have no bearing at all in this example???