What is the most dramatic way of increasing a speaker's Bass and Low mid?

Hey Raul, tone is much much better. Overall warmth that i was after is much closer to the mark. At the same time the Merlins have their character which is still on the bright side. Still lacking bit if "Body" for lack of a better word.
At this time im running from DAC with variable gain directly to the Joule amps.
I should get the Joule preamp this weekend. Hopefully this takes me a step closer.

Im open to more ideas. Don't hold back...Its a journey...;)

dumbeat@
you say that you speakers with 6.5" driver go down to 28Hz.
i just curious how you know his?  Did you take measurement ?
for my experiences only big boxes with drivers 12-15" can achieve
this down point with -3db.   

Well they do according to Steteophile measurements but i have no issue with that area as i have a sub. My issue is low mids and higher bass. The “body”, not the “Floor”...

I've been all over the VSMs: LPS for BBAM, replacement of stock Hovland mylar caps in crossover with ClarityCap CMR, replacement of stock Caddock resistors with TX2575s and Dueland graphite resistors, bucking magnet on the 8545, silver wire inside, buffalo felt around the tweeter domes, Stillpoint footers, steel microbearing instead of sand in the cabinets.  You likely won't get to any of this, but each step is a meaningful refinement.   

The more i listen the more i realize that there is a specific volume and sweet spot of sitting where they sound just unbelievable, above that volume they begin to sound harsh to my ears. Same for leaving the sweet spot.

Also they just want to play great full sounding recordings, they make any recording that is not stellar seem naked and harsh... Listening to the last Bootsy Collins this past hour. WOW, sounds amazing! earlier Steely Dan sounded terrible and thin (go figure).. i guess you need music that respects bass on these...;)

Also classical sounds really good on these. Pop and rock for the most part sounds harsh.
What im thinking is that these speakers are probably so pure that all the added high end that is associated with pop/rock studio production is very unnatural and unrealistic(I know because i mix for a living...) just don't translate well on the Merlins, while Classical and Jazz and Funk which is really amazing players recorded really well and generating a very balanced frequency range translate great.

This is where these speakers shine. They are not for originally thin recordings, they just don’t "help" them as other speakers do. And thats a good thing and a bad thing...

Point is- i come from music, not form love of sound reinforcement necessarily, so i cant choose music for my speakers, i must choose speakers for my music. Its not like im going to listen to music that my speakers like. That would be quite sick. Half my library does not translate well at this time... And i plan on listening to my library.,

So we’ll see, because im in love with them on music that sounds good on them.
Might have to insert a good EQ probably and adjust by record... just like i do when i mix at the studio...