Hi John,
The Diamond base powering the CD IV uses a switching power supply for the transport (however the Diamond base uses a linear power supply for the DAC). The Signature Transport power supply is a linear power supply dedicated to the transport. Only you can decide if it is "night and day" but based on what I heard when I did the comparison in my system it was definitely a pretty significant improvement in sound quality.
Hope that helps.
The Diamond base powering the CD IV uses a switching power supply for the transport (however the Diamond base uses a linear power supply for the DAC). The Signature Transport power supply is a linear power supply dedicated to the transport. Only you can decide if it is "night and day" but based on what I heard when I did the comparison in my system it was definitely a pretty significant improvement in sound quality.
Hope that helps.