I created my acoustic room with plumber tubes from my basements for 100 Helmholtz resonators...
I used mechanical crossfeed to improve the holographic acoustic perception..
I used foldable screens as lenses and diffusors or absorbers or reflectors...And many other improvised devices at very low costs , a few bucks, nothing marketed as tweaks except springs and cheap Schumann generators i modified etc ...
I lost my room...
I dwelved then in my unloved 200 bucks small speakers i owned from 10 years ago or 12 and put them on computer function for all this time because i never bother to optimize them to begin with ...After the lost of my acoustic room i had no other choice nor any other speakers to work with save the unloved one ...
I transformed them with cardboard and straws and isolation and damping and i put them in a small acoustic corner of my basement ... They go now from their unsufficient 85 hertz to 50 hertz which is enough 😁... My best optimization control was wood plates beside each speakers to mechanically decrease crosstalk in near field listening now...
My system is so good in near listening i cannot quit the music imaging, timbre and soundstage...
This small box system is better than my past headphones, with the exception of my main audiophile system now headphone based...
How is the cost of audiophile experience ? Peanuts costs if you learn basic electrical, mechanical, and especially acoustical embeddings controls...
By the way i am not an engineerr nor a very talented craftworthy person.... .But many experiments cost nothing and acoustic is fun to learn in its basic...Forget equations, experiment with the simple principles behind the equations and dont bother for perfection...
We must learn how to hear using acoustic concepts applied...
Audio is like medecine , learn to know your body needs and stay away from doctors if not chirurgically necessary; and learn acoustic basics and stay away from audio marketing....
Many people prefer to pay than to learn because it takes time and they prefer the power of money to knowledge..... Marketers count on this to make money...
I’ve never called myself "we" even during communism and have seen stereo system built from scrap components (in Cuba) and sounding TERRIFIC.
Have you ever seen a card-board upright bass?