So the lesson I have learned is we are NOT done yet w/ our speakers !
we have our speaker systems and they CAN be ( most of them ) be made markedly better / improved w/ mods to the crossover , connectors the box or ?
IF you want to .
There are some clever audio engineers who have done or will do it . some of them you can send them speakers ( ask first ) and they will test them FREE , show you the graphs, tests and they can make a better crossover , etc. -( if they CAN be improved
Some it is not worth trying -hey a few speakers , very few, ARE good to begin w/ !
Others ? it would be like putting lipstick on a pig !
And ? yes maybe you will end up spending so much you could get the / some more expensive "better " speakers . OK
but then THOSE probably are not optimum either ! LOL 
I own several good, really good vintage speakers Yamaha , some Vandersteen 2 ce , Allison acoustics AL130 , etc . and as time and finances permit ,( I’m mostly retired on SS ) i will pay the shipping both ways and send them for testing ! some will be left as is some will be fixed , modded !
Seems many / most of the speaker makers cheap out ,cut corners , build to a price point and compromise .
EG
there are two REALLY good re-do’s for the venerable Yamaha NS1000M speakers !
GR research can for next level, upgrade the speakers w/his crossover kit or Troels Gravesen has a crossover upgrade kit for that model Yamaha NS1000M as well ( posted 6 yrs ago )
He did like them and noted an upgrade brings them up to compete with modern loudspeakers,
that’s saying something coming from a loudspeaker designer. & Audio engineer!
well he’s like Danny he’s into making money The upgrades are a LOT $ of money !
they both charge almost $1,000 for the crossover kits ( for 2 speakers )
I thought it was kind of quaint Mr Graves uses felt, or was it wool for material to control resonance.
I pointed out Danny uses something called No rez which is a little more high-tech.( like HUGELY better! ) !
If I had a spare $2,000 I’d buy both kits do one speaker with one do one speaker with the other then A-B test them and then do both / ALL speakers what was best.! ( or which you prefer )
If you get a kit from Mr. Gravesen do a speaker and ( I HOPE ! ) send it to Danny for testing he can test it against one of his maybe LOL.
BTW I REALLY like his ( Mr Gravesen’s ) design for a center channel speaker ! it is impressive ! ( but another topic and NOT vintage heck there were NO center channel back in the day ! )
Hi! Have you sent A Yamaha NS 1000mm to Gr research yet ?
well, you do not need to !
3 months ago he did the NS1000M ( on YouTube ) you may be familiar with it ? if not watch it !
i’m all in favor of upgrading fine classics to 21 st century ! they CAN be better!
IF you want to !
most interested to read this most folks would not just fork out the $ and say build them! they will DIY fr plans , or easy flat pack kits but it was right for you so why not ?
for a good review of your speakers and the other similar model i can suggest folks listen to, watch these videos ! they will answer most of the questions , concerns folks have besides they are interesting !
https://youtu.be/w-ZzXaVq2TE?si=q7t-Z3krQjPTLQ4_
https://youtu.be/Gr1WQKWUos4?si=7G8t1v7tSdKQY4Lc
https://youtu.be/uWu883ShzUg?si=KAZfrLEmKgRl4Nw0
https://youtu.be/A7hPVAvuzxo?si=5z08ordtTx71o5TT
