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In Reply to: RE: Amps for esl63 posted by Satie on March 07, 2017 at 10:06:05
"The extra panels of the later quads increase power handling and extension."
Unfortunately this is not the case. The speakers will not play any lower, louder or handle anymore power than the 63.
The extra panels give the speakers more weight and authority in the bottom octaves.
Follow Ups:
Not sure you're right in claiming that extra bass panels don't play lower. This from Quad site showing frequency responses of their current models - with 2 and with 4 bass panels:
2812 (2 bass panels) - Frequency Response 37Hz - 21kHz (-6dB)
33Hz - 23kHz (useable)
2912 (4 bass panels) - Frequency Response 32Hz - 21kHz (-6dB)
28Hz - 21kHz (useable)
I have 2905 (predecessor and almost identical to 2912) and I can assure you that it can achieve very respectable levels of bass down to very low frequencies
"I have 2905 (predecessor and almost identical to 2912) and I can assure you that it can achieve very respectable levels of bass down to very low frequencies"
And so can the ESL-63 just a matter of degree.
The differences Quad notes in frequency extension is irrelevant as a practical matter.
It may not be any more sensitive at a given midrange freq, but the 2900 series does produce more SPL power with additional power amp capacity vs. the old 63 that played the same with 50 W models as it did with 200W amps of the same basic architecture. Much more bass and apparently louder, which it wasn't with the 63 with similar amps being swapped (50 watter vs. 200)..
"Much more bass and apparently louder, which it wasn't with the 63 with similar amps being swapped (50 watter vs. 200).."
Much more bass? No. A little more bass. A slightly bigger sound if you will, because the middle of the speaker is higher off the floor, but no louder. Power amp requirements are no different.
This is a matter of degrees. Compared side-by-side the differences are apparent but nothing earth shattering.
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