There's only an amp and DAC on that picture. I use Cary CD transport or computer to change the album.
The heavier/thicker sound has more low-level detail and dynamics. It is better in every way.
When I first tried books I was using P300 Power Plant which gave muddier sound, and I needed to compensate for it by adding edginess to the sound. I wasn't able to put all the books on until I removed the P300 Power Plant. It sounded like more books was more neutral but it was too dark so I couldn't use it. Without the books there was more midrange emphasis and more surface brightness which gives the illusion of surface detail, but there wasn't any low-level detail.
This is what I said 4 months ago:
Mass damping with books sounds more neutral to me now, it is better in every way. It's not like the fake dynamics from fat Valhalla power cord. Books add true low-level detail while the Valhalla removes low-level detail.
The same is true with EMI shielding and power conditioning. If the system already sounds warm, then fixing EMI, AC noise and vibration problems will make it sound too warm and muddy. For a long time I didn't like PS Audio Noise Harvester, it wasn't in the signal path so it didn't worsen the sound at all, it just removed noise from the apartment wiring. It made the detail less apparent. When I removed the Harvester it sounded edgier and faster, I liked that more. But now it is obvious to me that less noise in the apartment wiring makes the components work more like they should. It sounds worse but it's more neutral.
The reason high-end gear sound better when plugged into the wall is because the AC noise compensates for the muddiness of the high-end gear.
Benchmark DAC1 sounds bright when plugged into the wall because that's how it should sound. When you fix the EMI, AC noise and vibration problems you hear neutral sound with more low-level detail than from high-end gear. Fixing noise problems with high-end gear doesn't make the component work worse, it makes it work like it should. But the end result doesn't sound as good because there isn't any edginess to compensate for the extra warmth.
Vibration and EMI are those I would fix first because they don't add weaknesses to the sound. Power conditioning adds weaknesses and you would need to compensate for it by adding EMI or vibration to the sound which results in less low-level detail.
The only power conditioner that gave brighter and faster sound than the wall was Premier Power Plant. It also gave dynamics and low-level detail.
I use a DAC and amp that are made for professional use, Benchmark DAC1 and ICEpower. The measured performance is what I care about. High-end gear are warmer than neutral because they are made for music listening. They are made to be plugged into the wall. But the overall performance is worse when using tweaks that fix the problems.
Yes. I use as many books as I can. If the Magix were stronger I would be using a lot more books. I spend a long time fine tuning the weight and position of the Magix.