I have tried (and rejected) most tweaks in my high end audio system. I purchased the AudioDesk for $150 back in 2006 (It's at least $1150 now). It made a very slight improvement in the dozen or so discs I tried it on (I have 7,000). I haven't used it in 15 years and could sell it at a substantial profit. I destat my CDs before play instead (like LPs). I also tried the Synergistic Research black box and Atmosphere XL. The black box was a failure in my system as it cut off sounds above 8Khz. The Atmosphere XL worked, subtly and effectively but at a great hassle. I prefer to stick the CD in the transport and press play and enjoy. Just as I don't change the VTA for LPs (I have 28,500). I set it and forget it using a modified SME IV arm. Now many of the posters over the years DO NOT understand the ability to extract from ordinary recordings (I appraised 18 recording studios from the 80's to 2000s-saw cheap ass to extremely conscientious recording equipment/rooms) tremendously enjoyable sound, much beyond what inexpensive equipment mostly does. My electronics and cabling (with a custom audio engineered room costing $150,000+) permits me to use older but highly regarded speakers. Sure, I'd like to own an Von Schweikert Ultra speaker (the $1 million audioshow systems are spectacular sounding with my classical and jazz recordings) but I can get away with Legacy Focus and Signature IIIs for now. I also tried half a dozen lower priced ($150 to $650) digital cables for my transport and DAC. No soap, bad to okay after using a high end CD player for 15 years (EAR Acute analog-like but lacking in resolution, dynamics and frequency extremes where newer separates are superior). Then I tried (and purchased) the Synergistic Research Atmosphere X Euphoria digital cable for $1500. That brought my digital sound up to my analog. From ordinary CDs. Mono and 78 rpm CD music as well. Shockingly good. No, I did not purchase the Galileo SX or SRX at 2X and 4X the price. Will they provide me with 2X to 4X the improvement in sound? Probably not. The rest of my cabling is made by boutique manufacturer GroverHuffman.com at $700+ per power cable, interconnect and speaker cable. They compete with the higher end/read expensive cables.
I understand not wanting to pay $28,000 or $40,000 per cable. I would never do that and I can almost afford to do so. But singling out Synergistic and Shunyata who both have up to 8 levels of cable is dumb. They make quality cables at a price point. There are so many others that make crappy cables with no effort, made in China as well that also sell for similar prices. High Fidelity cable went out of business this year. In 5 settings, they were the absolute worst cables with giant magnets in the middle of the cable. Total engineering failure. Other expensive lines include Transparent, Nordost, Ansuz, Kubala Sosna, Audioquest, etc. which sell cables in the upper double figures as well and upper single digit $K Jorma, Cardas, etc. I've heard Transparent cables where the most expensive ones sounded worse than the less expensive ones ($70K versus $12K). That is also common.
The tweaks that made a difference in my listening room include SR blue power outlets, amp fuses and HFTs. Instead of HFTs, I could have spent 5X - 10X more and purchased rear and front wall quadradic diffusers with 1' or greater depth. That would have ruined by room intruding on the rear wall in particular. Actually only five of the HFTs make a significant change. The front center wall HTF-X and the four side speaker HFT-2.0. The rest, well they appear to work well at diffusing the sound and hardly noticeable.
There are so many tweaks my friends have used mostly unsuccessfully and we dispose of them (or don't purchase them in the first place).
The monoprice cable is crap. Blue Jeans, Pangea, Mogami, etc. are cheap cables. They will play music. They just won't play music at a realistic, high level in a good quality music reproduction system. I am not talking about the recording end, just the playback end. As I previously mentioned, I have seen recording studios use junk to extremely expensive equipment and cabling to obtain great recordings. A decent cheap cable is Monster 300 interconnect, the original from the 80s, not any other model. The designer went on to develop his own high end (expensive) line of cables.
My point is that unless you have heard outstanding musical sound, thoroughly involving, cheap or expensive system, there is no reason to out of hand demean expensive cabling and other tweaks. Those on this forum who consider high priced cable manufacturers as frauds and should be shut down and/or criminals are ignorant. Yes, there are those who are frauds but most are seriously interested in selling quality products. They mostly have very large lines starting in the few $100s range. You often get what you pay for, sometimes not. That is not a crime.