ct0517:
This is what I have on the DM70’s so far from different sources.
https://1drv.ms/f/s!AsdR4rYZVpE4sUzCKIvZoEG9f5Ag
Sorry, but there may be duplicates and it includes what I got using the link that you provided
I like this in particular, as there is a very long explanation about their development:
https://1drv.ms/b/s!AsdR4rYZVpE4sDU7GJjlvhBf1_2N
I note that a later equivalent for 1974 is much shorter and more simple.
My treble issues also show up when I use an amp that previously worked OK with these speakers, so it seems that there is some issue with my speakers.
I talked to One Thing Audio who suggested that I get the ’energiser’ units serviced as a first step.
They said that it is very common for the diodes to fail and that they would replace them all as a matter of course. If that does not work I will send in the panels for repair.
Their horizontal dispersion is also quite good due to the curve used.
B&W did say, however, that a vertical arrangement was tried.
Hope this is of interest
Ian
This is what I have on the DM70’s so far from different sources.
https://1drv.ms/f/s!AsdR4rYZVpE4sUzCKIvZoEG9f5Ag
Sorry, but there may be duplicates and it includes what I got using the link that you provided
I like this in particular, as there is a very long explanation about their development:
https://1drv.ms/b/s!AsdR4rYZVpE4sDU7GJjlvhBf1_2N
I note that a later equivalent for 1974 is much shorter and more simple.
This tells me they need really good setup or people will hear 50hz - 15khz (or less) with an average setup
My treble issues also show up when I use an amp that previously worked OK with these speakers, so it seems that there is some issue with my speakers.
I talked to One Thing Audio who suggested that I get the ’energiser’ units serviced as a first step.
They said that it is very common for the diodes to fail and that they would replace them all as a matter of course. If that does not work I will send in the panels for repair.
My feeling is if B&W kept producing them, the ESL panel would have grown in size - taller, as ESL Panels become more efficient with size.I am not so sure, as making the panels taller would change the dispersion pattern.
Their horizontal dispersion is also quite good due to the curve used.
B&W did say, however, that a vertical arrangement was tried.
Hope this is of interest
Ian