To me, more transparent sound is better sound. You will have less headache after a long listening session. Generally, bold and thick sound (in same loudness) is better. They have bigger sound images. Thin sound is OK for easy listening. Thicker and vivid sound is higher end. Don't confuse with peaky, scratch, and confused sound. The good sound is musical. The sound makes you good feeling or tapping toes is a good sign. It doesn't matter how the sound is impressive or has big sound stage. If the sound is boring after 10 minutes, it's not a good sound. However, a good sound system sounds sometime boring with different music and condition. The good sound is described as transparent, clear images, clean sound, palpable, define stage, huge sound stage, sweet, refine, delicate, PRAT (musical timing), etc.
If your sound system has some degree of above qualities, then you want these qualities such as tight or generous bass, beautiful mid range=human voice, more details of sound, correct tones of musical instruments, deeper 3D sound images and stage, more live sound or more illusion of acoustical beauty, etc.
I've been in audio for 25 years. Above qualities are what I want from my sound system. I expect other audiophiles are looking for something similar. Please you audiophiles add some more qualities of good sound that I missed.
If your sound system has some degree of above qualities, then you want these qualities such as tight or generous bass, beautiful mid range=human voice, more details of sound, correct tones of musical instruments, deeper 3D sound images and stage, more live sound or more illusion of acoustical beauty, etc.
I've been in audio for 25 years. Above qualities are what I want from my sound system. I expect other audiophiles are looking for something similar. Please you audiophiles add some more qualities of good sound that I missed.