I have the esl and itching to upgrade to the esl x. Is it worth it. I want the lower crossover point but was wondering if image and soundstage will be as stable as the esl. I would guess esl x has more midrange purity and of course bass.
I have listened to EM-ESL and own ESL 9. Not listened to EM X. The following is my subjective opinion.
First advantage.
Classic 9 has freq. response 34hz to 23khz. EM X freq. is 41hz to 22khz.
Classic 9 has too much bass. Sometimes booming. I have not done room treatment. I listen to radio through audirvana. Because of too much and booming bass i no longer upsample to 384 khz and for the same reason no longer use kernel streaming. Use WASAPI instead. All this to tame the excessive bass.I guess EM X has just right bass response. Not less like EM ESL and not too much like ESL9.
Second advantage.
In addition ESL9 has impedance of 0.8 ohm at 20khz. EM X is 1.6 at 20khz.
I wish the ESL9 panel was louder or more dynamic. Overall speaker sonics give much weight to low frequencies. Because of comparatively friendly impedance profile EM X sonics may give more weight to panel compared to ESL9.
Disadvantage.
EM X has less weight than ESL9. Less heavy duty or durable.
Conclusion:
Classic 9 is a big upgrade from EM ESL. And I guess EM X is a big upgrade from EM ESL. When you listen to EM X you will know is sonically superior to EM ESL. And EM X is substantially less expensive and amplifier friendly than Classic 9.