many audiophiles and audio professionals prefer the warmer, richer tones produced by vacuum-tube-driven amplifiers

many audiophiles and audio professionals think the warmer, richer tones produced by vacuum-tube-driven amplifiers make them preferable

warmer, richer tones are produced by vacuum-tube-driven amplifiers and they are thus preferred by many audiophiles and audio professionals

vacuum-tube-driven amplifiers are preferred because they produce warmer, richer tones by many audiophiles and audio professionals

vacuum-tube-driven amplifiers are preferred by many audiophiles and audio professionals because these amplifiers produce warmer, richer tones