Bottlehead Forum
Bottlehead Kits => BeePre => Topic started by: Alonzo on June 29, 2018, 06:00:01 PM
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Okay, so it's time to change out some of my equipment (just cause it's been sitting comfortably too long). So I have music playing (Bluesound to Gimby DAC to BeePre to Stereomour) and I start to unplug some of my equipment. At the BeePre, when I get to unplugging the RCA's from my SS amp (Schiit Vidar) the Stereomour gets louder. So I do the normal thing and plug it back (volume decreases), unplug (volume increases). I repeat this with the Vidar inputs to all of the BeePre outputs ( I have 3) and it's the same. The Vidar is 47K input impedance, is that driving down the output of the BeePre to the other outputs since they are tied together? I do not have a balanced output, 3 unbalanced instead. Anything I can do to fix this?
TIA,
Alonzo
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The output impedance of the BeePre is the upper leg of a voltage divider with the components it drives.
The output impedance of the BeePre is about 600 ohms (603 when I last measured one), so we get:
BeePre driving Stereomour is a 600 ohm resistor in series with a 50K load, this causes 0.1dB of signal loss.
BeePre driving Stereomour (50K) and a Vidar (22K) in parallel will cause 0.33dB of signal loss.
There isn't anything to fix in this situation, this is just the way things work.
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Thanks for the lesson Paul. Luckily there's plenty of range left on the volume knob.
Alonzo