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

I'm going to have room treatments done, that will most certainly require professional measuring equipment, and someone who knows how to use it.

I'm an electronics technician who is very accustomed to working with all kinds of measuring tools, but the only thing that can measure "high end" audio is a pair of keen ears.

The people who don't have them wouldn't understand that fact.

bache, polypropylene capacitors are better than teflon capacitors; no one let me do anything, I changed the capacitors because I wanted the best sound; they're my speakers, my crossover.

Here are the ratings in capacitors, and teflon comes in down the list from mine;


        https://www.gearslutz.com/board/geekslutz-forum/434325-what-best-musical-sounding-capacitors-use-rec...


 

No my friend, you are wrong; this crossover was designed by a crossover engineer who was working for a company that sold speakers. It is a 3-way 4th order crossover, T-type.
92 DB efficient.

What I'm listening to has solid firm bass.


These are the capacitors that are in the bass leg of my crossover.


      https://www.parts-express.com/solen-100uf-400v-poylpropylene-capacitor--027-616

No I didn't check the schematic, but I know only the most expensive speakers use teflon capacitors. I don't even know if your speakers are among the most expensive speakers; maybe they are.

My speakers were custom built by me. A speaker design engineer designed the crossover, and I took it from there with some help from a place that sold raw drivers. In order not to go over budget, we used electrolytic capacitors; this gave us a general idea of what the speaker would sound like.

After listening for awhile, I decided they were worth much better and more expensive capacitors, such as Jantzen Silver Series Z Caps. The largest capacitor running my 12 inch woofer is a "Solen", 100uf, 400V.

     
          https://solen.ca/product-category/capacitors/ capacitor



These capacitors on the woofer section of the crossover will eliminate "tubbines"; you will have sharp bass lines.

Without a doubt, the very best way to get high quality bass from your speakers is to replace the electrolytic capacitors in the crossover of your woofer driver with teflon caps.


  https://solen.ca/product-category/capacitors/


You simply replace them using the same value and voltage rating (higher voltage is OK, but not lower). Since you won't have enough room in your speaker cabinet, that will be a problem you'll have to solve.

Being an audiophile ain't easy.