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

Interesting, How is the 8545 mod is done exactly?

By the way, as far as amps go, which would give more "Warm" "Full" sound (100hz-400hz) and a bit more forgiving, mellower high mids (2khz-4khz)?

SET? OTL? Push pull? Out of those any particular one to match well with the merlins? they do not need a lot of power. I can get by with 30wpc easily at my listening enviournment, and the Impedance is not suppose to fall bellow 7ohm if im correct.

Rough sand off the lacquer coating the perimeter of the steel plate that covers the stock magnet. Rough sand the mating surface of the donut shaped bucking magnet. Place the driver face down on a level surface. Thinly coat both surfaces with 5 minute strong epoxy. Apply the bucking magnet in the correct direction. (It will be repelled as it approaches the stock magnet and attracted when in close proximity.) Make minor adjustments to align the magnet as the epoxy stiffens to ensure that the two magnets are concentric with each other and thus the voice coil.

Interesting... Ill skip of course, but interesting information. Thanks.

From Dumbeat (addressing bi-amping):

...These Merlins are total magic in certain respects that im afraid to lose at this point. To remedy what i consider their weak point(Low Mid and bass fullness) would be ideal for me, so maybe bi amping would do it,

I also have a pair of speakers that are famous for "total magic in certain aspects" with a weak point in "Low Mid and bass fullness" They are Magneplanar 1.7 panel speakers. Their "total magic" is reproduction of acoustic instruments and voices that is spooky real. They create the illusion of a full-size concert grand piano like I’ve (otherwise) never heard in my house in the 46 years I’ve pursued this hobby. Piano sounds so real it often elicits an involuntary response of turning my headd quickly to see where the piano is.

On their own the panels start to roll off around 50 Hz and are MIA by 40 Hz, or they were until I added a pair of subwoofers. In my situation I got a pair of small, fast subs whose transient response blends with the panels and increases the bass extension to a totally functional 36 Hz. This makes string bass and bass guitar credible and also achieves the fundamental frequency of a 22"-24" dia. bass drum.

Blending is relatively easy because it has continuous 0-180 deg. phase controls, volume controls, and also continuous crossover frequencies.

If I wanted to go all out, I would get a pair of JL Audio E110 subs, which would increase bass extension for more instruments and overall dynamics for large orchestral and big band recordings.