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There was someone selling an equivalent item (as stated by the seller) on ebay at one time (?) or perhaps contact member Edgewound for one of his.

Personally, i’d leave the hole alone and not worry about it.
re alignment, if the adhesive is now completely ineffective, you could try thin, double sided tape... A sweep test will bring out any...

Yes, same lack of ribs on the aquaplassed 4" dias. I bet they tried it. Probably dampened the upper freq tizz that the stiffened/ribbed diaphragms added to measurable and noticable effect, so why...

JBL did put aquaplas on these Ti domes... LSR32 and 28. 053Ti ... don't know if that was instead of, or in addition to foam. :dont-know:

Also, the residual adhesive on the 'plinth' is sufficient...

Nice. You can see how squishy the foam is. Lots of good info!

Congrats Grandpa Ken! :)

Sounds like a good plan. A few mm of 'squish' is probably safe, vs more for the original. But not being able to compare makes being conservative a likely wise move. Don't want to deform/damage the...

That should be fine. The charcoal pick&pluck foam from the same vendor might be worth checking too (nice sized chunks pre-scored). Whatever is used should compress -very- easily. The foam plug that...

tape, sticky side out, on a stiff piece of plastic... e.g., part of an old credit card.
new tape, clean gap, inspect gap and tape, repeat until clean.

You don't want to add any abrasive or metal...

On a system that “new” I would expect not, unless something is damaged or you wish to alter the sound for some reason (rethinking or revising the crossover, for example).

There are those who...

My thought is that 70w/channel might not wake up the L150A.
I used a similarly powered integrated amp, that also doubled its power into 4 ohms, and was surprised at the difference when I replaced it...