Planning to get a Wiim Pro and plan to connect it directly to a power amp, I know the Wiim pro has a digital volume control, but since i would be connecting it directly to a power amp (Rotel RB 1090) , I am afraid that there would be a possibility that the remote or app used to control the power amp might go berzerk and go full volume on the power amp. I would like to insert a potentiometer in between the Wiim and the power amp, what value for the pot should I use? The power amp has an input impedance of 33k ohms, sensitivity is 1.8v. I know the Wimm pro's analog output is 2.0v
Well no datasheet for the Wiim Pro, but lets face it the output will be an opamp, and nearly all opamps can drive 2k linearly, so 2k stereo pot ?
Using the lowest value will mean the least extra noise inserted in the power amp's inputs. And you'll lose the high hiss volume when the Wiim Pro is switched off too (open inputs to a power amp are typically noisy).
Using the lowest value will mean the least extra noise inserted in the power amp's inputs. And you'll lose the high hiss volume when the Wiim Pro is switched off too (open inputs to a power amp are typically noisy).
Good thinking! A 10 kOhm logarithmic stereo potentiometer will work out OK. An RC network per channel before the potentiometer to catch nasties with an Fc of 100 ... 200 kHz would be wise.
Make sure to locate the potentiometer close to the power amplifier with short cabling and use a metal casing. You could think of a remote controlled relay based volume control.
Make sure to locate the potentiometer close to the power amplifier with short cabling and use a metal casing. You could think of a remote controlled relay based volume control.
If the topic was instead resistance values , it widens considerably the scope to do this properly