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It's not the ESL portion of Odyssey that's the problem for any amp, it's the passive bass xo. So go active in the bass only, and they'll sound as good as the new ones.

Not a dumb question! If they're Ascent 'i' (with Gen2 panels and aluminum cone woofer) then with a $100 active xo (plus an amplifier) you can make them active xo in the bass, and bump up their bass performance. Rolls SX45 would work....

In our house, our printer turning on made my amp's transformer growl, so I made one of Rod Elliot's DC blockers. But that was just to stop an annoying noise, not related to any chance of damage. I attempted to check the peak "DC" voltage at the DC blocker a few times, and it was never more than...

Fix only what's broken (bass passive xo). Stop making excuses, and use an ANALOG active xo on ONLY the bass!

If a portion of the panel is making sound while another portion is quiet, then try squeezing the stators together along the right and left edges to encourage making a better connection between the copper charging strip and the diaphragm.

They also suspected they were under an ultrasonic attack...

Stop horsing around and use an active xo for the bass only!

Are they BOTH making noise without any amp connected?

Are you close to the US embassy in Havana Cuba?

Does Sequel 2 use a 10 inch 4 Ohm woofer in a sealed box? If so, then the same woofer recommended for SL3 and Ascent would work technically, but you must make sure the new basket OD fits into the counterbore of your Sequel 2 or make alterations. I recommend you repair or replace as pairs. Woofer...

Is the SL3 schematic close enough to Sequel II?

Those photos don't show the Gen2 clearspar panels that should be in the Ascent 'i'.

Diaphragm tension runs top-to-bottom only. If there were tension along the curve, the diaphragm would 'saddle.'

Phone Russ at justrealmusic: Contact us I've heard he's not taking on more work, but he'll still talk to you...

https://www.martinloganowners.com/threads/ml-sl3-adding-an-active-crossover-with-a-sub-how.14871/post-158098

If your SL3's replacement panels are of the newer Gen2 clear spar type, then they have many years of life remaining. You can bring the SL3 closer to the bass performance of the newer active bass ML hybrids by using an active xo on only the bass. It's not just lower bass, but more tuneful and...

Watching your updates with interest, Neil!

You need to keep them from separating while out of their enclosures. Likely the rubber weatherstripping behind the panel has shrunken from age and will need an additional strip of rubber or foam to restore the original clamping pressure when reassembled.

Only buy the later Clearspar version (Ascent i).

Yes, active xo is done with op amps. But you can still use the passive high pass xo to the panels and avoid op amps there, while using an active op amp-based xo on only the bass (requiring another amp and bypassing the stock passive bass low pass section of the xo).