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You need the 4 ohm version woofer if you're keeping the passive xo. Attached is a progression of SL3 back panels with crossovers. Yours strangely is early, falling after the first version, but earlier than the middle one, but uses the latest Vifa woofer. I used to have a final year (2000) SL3...

The bass is an independent circuit and doesn't go to the board, so you must have poked something else. Lots of 20 year-old connectors in there to freshen up. The attached SL3 diagram is basically the same circuit that Ascent uses, but the Ascent board is more compact and uses different part ID...

Don't throw good money after bad! Start looking for some Ascent 'i'! The original aluminum cone woofers used by ML were made by Vifa but not available on the aftermarket. There is an 'official' replacement 10 inch Scanspeak 26W/4534G suitable as a plug-n-play woofer for sealed (not ported)...

Impressive work, AP! Have you tried sealing the port? Those Vista woofers need a good plug-n-play replacement...

Now I also have a pair of Motion10 and can say the top end and midrange are wonderfully clear and detailed, similar to my Ascent 'i.' And the bass is perhaps a tiny bit better than expected for a ported cabinet with two little 5 inch woofers...

So one works totally fine? Swap the PS board L to R, so as to isolate the problem to the PS board. Look at SL3 HV PS diagram attached and check if you're getting output from T1.

For way under $1800 you could get a pair of used Ascent 'i' with the later Gen2 panels (and the killer aluminum cone woofers).

https://sound-au.com/articles/xfmr-dc.htm "There are any number of different machines that can create a mains supply DC offset. Most will be totally outside your control, many DC 'events' will be transient in nature, but one common theme applies - they will all load the mains supply...

https://www.canuckaudiomart.com/details/649633063-martin-logan-aerius-8-woofer/images/2770543/ These are the early Aerius woofers from Eminence.

Remembering out loud here: Didn't the woofer change to an 8 inch 6 ohm paper cone cast basket Vifa (also used in Odyssey) with the jump to the Aerius 'i'? Earlier Aerius had a stamped steel basket Eminence woofer.

If you have Vifa woofers in your SL3 then these Scanspeak will fit P&P. But if you have earlier SL3 with the Eminence stamped steel basket woofer, then the counterbore is too small. But while the bass xo remains passive, there is not much improvement in the bass from changing woofer. Now, with...

Yes, they get brittle and crack apart, so be nice to them! ML wants $20 EACH. Find something cheaper!

Roberto, I accept your findings on measuring 1900 VDC by >direct contact< on the front but not the rear. I also remember another ML having ~2500V bias. The electrons which carry the electrostatic field 'ride in' the coating (or coatings) which is on the front and are insulated to the rear by the...

Jason, Do you have a winter update? Both panels are capable of hissing? Not just a faint squeal? On the subject of cleaning the rear, 'dirt' can still get on the rear and cause HV shorting to the stators. But as the speaker is usually leaning back a little, dirt on the rear is much less than on...

You could try putting a wanted ad on Audiogon? I found my first ML SL3 this way!

Neil, did you try to contact MJ Dijkstra via diyaudio? https://www.diyaudio.com/forums/members/mj-dijkstra.html

Converting to active xo on passive ML hybrids that use two woofers which receive different freq ranges (like Odyssey and Prodigy) will need a two-way active xo on the bass to recreate the two stock passive xo's in those (and also require another amp and set of binding posts). The ESL portion...

also long article here about bi-amping: https://sound-au.com/bi-amp.htm These ML ESL hybrids combine two 'opposite' loads in parallel: the ESL panel and passive xo via the audio step-up transformer 'prefers' to be driven by voltage from an amp, while the bass woofer and passive xo 'prefers' to...

Try a soft bristle brush and vacuuming while observing with your magnifying glasses. Go over all the horizontal spars, esp on the front as they collect dirt.

Or at least take advantage of bi-amping. Then a nice small class A amp can be used on top, and big ugly-sounding multi-transistor amp on bottom. Divide and conquer!