Gallo vs. Quads ESL 57

Two different sounding devices.Had the 57s matched up with the Hartley,then M&K 12s and finally the Mag/Tym IIIb bass panels.My Gallos are modified:time-aligned the larger CDT and configured for a 9 ohm load.
You really are comparing apples-oranges.The 57 won't play with as much authority/volume,you need outboard x-over and the ESL tweeter is pure,but not as extended.Not to mention 4 AC connections.Imaging will also be different.
I suppose that each has its' place and making equipment accomidations for each will maximize their performance.

It is a matter of mating tweeters/woofers to take the load off that midrange.I tried the Decca and RTRs,though I would think the CDTs or Lineaum di-pole might be a better
match.Then there are the crossovers:Dahlquist and an EC-3 or?? I tried to stay passive as often as possible=ARC EC-3 into the Dahlquist.The 3 having passive top/tube low-pass,driving the input on the LP-1.
Now we needed to find amps suitable for Qiads,with enough power to sufficently drive the woofers and tweeter.
Sometimes you need to enjoy the speaker for what it does correctly and not try to "fix.Substitute a Klipsch horn and play symphonic.Back for small scale.

The Polk SDAs were okay in their time,somewhat dark.Not in the league of either speaker mentioned previously.