Mr G- Something that may be of interest to you: (http://www.partsconnexion.com/controls_attenuator_khozmo_series.html)
Passive attenuator impedance question
Hi,
I would like to build passive attenuators between my DAC and Amp (to reduce potential degradation in the DAC's digital volume control).
The DAC's output impedance is 100 Ohms and the Amp's input impedance is 100K. Using a 9K/1K resistor network I can achieve the desired 20dB attenuation. If my understanding is right, this attenuator will present itself as a 10K load to the DAC and an output impedance of 1K to the Amp. Both DAC-->Attenuator and Attenuator-->Amp will have a nice 100x impedance ratio. I read in another thread that > 10x is preferable.
Do you think these resistor values (9K/1K) are good, or should I go lower or higher? Obviously I am looking for optimal sonics. I realize the exact values will be system dependent; I'm just looking for some direction.
Thanks,
I would like to build passive attenuators between my DAC and Amp (to reduce potential degradation in the DAC's digital volume control).
The DAC's output impedance is 100 Ohms and the Amp's input impedance is 100K. Using a 9K/1K resistor network I can achieve the desired 20dB attenuation. If my understanding is right, this attenuator will present itself as a 10K load to the DAC and an output impedance of 1K to the Amp. Both DAC-->Attenuator and Attenuator-->Amp will have a nice 100x impedance ratio. I read in another thread that > 10x is preferable.
Do you think these resistor values (9K/1K) are good, or should I go lower or higher? Obviously I am looking for optimal sonics. I realize the exact values will be system dependent; I'm just looking for some direction.
Thanks,