AV Receiver vs Tube Pre Amp Sound Comparison

Comparing AV Reciever with a Tube Pre Amp, which are connected to the Crown XLS 2002 power amplifier and Taga Harmony speakers. Denon x3700 is using a subwoofer.
Denon x3700 is calibrated with Audyssey and the crossover for a subwoofer is 60hz.
Tube Preamp has no tone controls changed, everything is neutral.

Using royalty-free mp3 files instead of high-quality FLAC's due to copy-right issues.

Devices used:
Denon x3700 - https://amzn.to/3yjLbx2
Taga Harmony 606 v3 - https://amzn.to/3y6ZvsF
Taga Harmony TSW 212 SE - https://amzn.to/3zIHqBV
Crown XLS 2002 - https://amzn.to/3rDxaIo
FX Audio Tube 03 Pre Amp - https://amzn.to/3rA594h
Activo CT10 - https://amzn.to/2VgpLlR
RCA Switch Box - https://amzn.to/3kWv2Kb
Amazon Echo Dot (3rd Gen): https://amzn.to/3cEmnHm
Belkin RCA Cable to 3.5mm Cable : https://amzn.to/3zqofxm
CableCreation RCA to 3.5mm Cable: https://amzn.to/3cCbiXe
Cooling Pad: https://amzn.to/3vpEoQ9