What the difference between black and white panels?
Sorry for the delay in responding to your post. We are new to the Blog idea and have just been told off by our webmaster for not responding!
The original ESL63 panels were black prior to 1985ish before changing to the white.
The primary difference in the Black and White panels is that the 'louvre' is finer in the black panels which is desirable for base panels but not treble panels. There are a few issues with the assembly of the black panels which we address when servicing them. Many 'in the know' hold the black panels with a higher regard due to the increased rigidity provided by the denser form of the 'louvre'.
I hope this helps in some way.
From what you say on your website, I guess it isnt appropriate to drive my ESL63's with my Williams Hart mono power amps (about 100W each) even though I NEVER play music loud?
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I just received the rebuilt and restored ESL 63's from One Thing. I have never experienced such accurate music reproducers. I listened to a favorite CD-Beethoven Piano Sonata #31 played by Igor Levit-and the Quads revealed so much detail in both music and performance that I have never been so emotionally moved. This is the highest praise for any audio component: It draws you into the music and compels you to listen. I agree totally with Paul Seydor of the Absolute Sound: No other speaker than Quads will do. Praise to Steve Williams and One Thing Audio.
The old Forum goes all Bloggy.