Kill or Mute Transistors Impact on sound ?

A modification in a CD-880 , Kill / Mute circuit disabled. they say “It sounds beter” , can i measure any differents

Quick look

Added the Kill/Mute transistors.

Quicklook

Multitone measurement -20 dBfs 20 Hz – 96000 Hz

• Red  – with mute transistors
• Blue – no mute transisitors

Multitone measurement -20 dBfs 20 Hz – 20000 Hz

• Red  – with mute transistors
• Blue – no mute transisitors

Closer look at noise floor Multitone measurement -20 dBfs 20 Hz – 20000 Hz

• Red  – with mute transistors
• Blue – no mute transisitors

THD+N Ratio 0dBFS AES17

THD+N Level 0dBFS AES17