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

Dear @dumbeat: "  And thats a good thing and a bad thing. "    "  Half my library does not translate well at this time. "

I know and listened your Merlin speakers.

First time I heard the Dynaudio Esotar twetters was many years ago ( today Esotar 2 but from some years now Dynaudio is not any more a driver suplier for any one but its speakers. ) through a Sonus Faber monitor that till today was the deepest dimension of any two way speakers I never seen ( can't remember the model. ) and the hf range was to brigth/hars. This kind of characteristic I never listened in the own Dynaudio speakers designs maybe because they know exactly how to handle it. Esotar 2 is a little better but still brigth.

There is no reason for you can continue with that kind of quality level performance and if I was you what I will do is to change the Merlin's for something you already know very well ATC ones.

Merlin has that trouble no matter what. You need to change its design to achieve top level and maybe you can't get it.

ATC is one option about.

Regards and enjoy the MUSIC NOT DISTORTIONS,
R.

@rauliruegas 
there is something about them that i really love very much. I will play around with my other components and room a bit more before changing them.

Dear @dumbeat: There is no perfect speakers or audio systems, nothing is in audio.

Maybe speakers is the more critical and delicated ling in audio system chain because it is not only from where the sound comes on but because its direct relationship with all the links in the overall audio system chain including room and each one of us music/sound priorities.

In those order of premises what for you is rigth maybe for me or other gentleman it's not.

I don't like two-way speakers because to many " compromises " but for other people are the Nirvana.

Yes, you have to make your home-work about and I hope with the success you are asking for.

Regards and enjoy the MUSIC NOT DISTORTIONS,
R.

dumbeat@
 You can try use different cable ,  move you speakers back ,  but you 
never get not only dramatic changes , may be very very small changes.
you can listen my advise or not , but as speaker designer i suggest you 
first-most easy way , use  equalizer to boost 100-400 Hz, second more
kosher way, use you sub and change crossover in you loudspeakers
 apply baffle step crossover and high pass crossover for you 6.5 woofer.
http://diyaudioprojects.com/Technical/Baffle-Step-Correction-Circuit-Calculator/    and third , most efficiency dramatic way--- get 3 way good
Loudspeakers with 500 -700 Crossover frequency between woofer and midrange  

How did the Loki do for you?