Hi, I have a high end class-D pre-amp/speaker-amp set, and just bought a vintage Sony tuner (ST-5066).
The tuner offers both 'normal' (0.75V) and 'high' (1.5V) impedance outputs.
As a newby in audio, I would reason that you would let the best amplifier do most of the amplifying within the setup, so that would suggest using the normal output, and have the class-D do the heavy lifting.
However, cables to the pre-amp are 5m. I understood that long cables require higher voltage to reduce quality loss along the way, suggesting high output.
What would be most optimal, or are there more factors weighing in?
The tuner offers both 'normal' (0.75V) and 'high' (1.5V) impedance outputs.
As a newby in audio, I would reason that you would let the best amplifier do most of the amplifying within the setup, so that would suggest using the normal output, and have the class-D do the heavy lifting.
However, cables to the pre-amp are 5m. I understood that long cables require higher voltage to reduce quality loss along the way, suggesting high output.
What would be most optimal, or are there more factors weighing in?
Last edited:
Not sure if this is helpful, but pre-amp has:
Input impedance: 100kohm
(and output impedance: 44ohm)
Input impedance: 100kohm
(and output impedance: 44ohm)
"Normal" and "high" on your tuner refers to the output voltage (V), so depending on the input sensitivity (V) of the preamp, choose the appropriate output from the tuner.
The output impedance value (3.3kΩ / 4.5kΩ) of the tuner is not critical because the input impedance of the preamp is high enough (100kΩ).
The output impedance value (3.3kΩ / 4.5kΩ) of the tuner is not critical because the input impedance of the preamp is high enough (100kΩ).
I'd definitely go for the 'high' option both on signal level and output impedance grounds. With a 5m cable and 4.5kohm Zout you're getting into the region of HF roll-off if your cable happens not to be low capacitance.
