Cheap tweaks...What would YOU reccomend?

I've been on this journey for 35 years and just had my first OMG experience for $100! Hard to believe this tweak was an exponential improvement over new $6500 speakers and a $3K phono amp. Installed cable elevators from Balanced Technology. The net result was all the potential from my components was instantly realized. Never understood what "clarity" meant until the veil was removed. I've always enjoyed this hobby. Now, I can't seem to leave my system and this addiction is beginning to scare me!

You should try a B&W golf-ball texured port or a B&W tweeter in erection...totally useless but a great marketing tool from the geniuses at BandW or BMW as some people still think...

Acorn nuts under speaker spikes
I was getting really tired of having my spikes scratching my floor every time I wanted to adjust speaker positioning or just angle them inward. I bought 8 small acorn nuts, local depot, put in some earthquake putty ( or museum putty ) into the acorn nut and under the spikes. They isolate very well and when moving or adjusting position of the speaker they stay on the spike....actually, they look pretty good too!

I have found that a half round tube trap works wonders when placed a couple of feet ahead and right in the centre of the speakers.It is almost like listening to headphones,may have something to do with the old ambisonic mindset.I know it flies in the face of audio mantra"put nothing between you and the speakers" but this seems to do the trick.I think it cancels out interchannel crosstalk between the right and left speaker.One thing is certain, the centre image is rock solid not diffuse.
Now the next fun tweek has been demagnetizing my cd and vinyl collection.Next up are demagging power, speaker and IC's.The demag is working so well,there are a half dozen guys right now out trying to source units.This is the most effective tweek yet and I have done almost all there is to do.Dedicated 30 amp runs of 10 guage wire, Furman IT 1220 balanced power conditioner, Shunyata Hydra 2,and Annaconda power cords,upscale Shunyata and Goertz IC and speaker cables,while all beneficial,the Hammond F 21 tape eraser has proven to be the most beneficial and one of the least costly.To hear a before and after on an lp can turn a non tweeker into a believer.

This is relatively expensive, but not in the context of other acoustic products for sale-Cathedral Sound Panels. For $179/pair, they make a big difference. I bought 4 pairs from Decible Gardens, who had a 20% off sale for repeat customers in July. Total cost to treat my room was $605. The last move I did today was to replace a bass trap that I thought was doing a good job in my problem corner(I already had 2 Cathedrals near the ceiling in that corner. The change that made was incredible! I tested it with Jackson Brown's, "The Naked Ride Home" cd(highly recommended). The increased detail coming from that corner put the bass trap to shame. Now there is some controversy about the Cathedral Sound Panels, including a useless graph claim. I bought before I heard about it. My suggestion to you is to try them, then decide. Doesn't one ASC tube trap cost $500-$600? I treated my whole room for that. One listen should be enough to decide.