BeePre output questions

Alonzo · 1898

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Offline Alonzo

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on: June 29, 2018, 06:00:01 PM
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

Alonzo
Gameroom:>Mainline to HD820, SR45 to Pipette
>BeePree Kaiju & SII to Altec 19 knockoffs
Office:>BH Stat amp to Koss 95x, T20 SET to JBL 4309s
Den:> MorePlay 845 SET to Altec Valencia's


Offline Paul Birkeland

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Reply #1 on: June 30, 2018, 05:20:17 AM
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. 

Paul "PB" Birkeland

Bottlehead Grunt & The Repro Man


Offline Alonzo

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Reply #2 on: June 30, 2018, 03:22:12 PM
Thanks for the lesson Paul.  Luckily there's plenty of range left on the volume knob.
Alonzo

Alonzo
Gameroom:>Mainline to HD820, SR45 to Pipette
>BeePree Kaiju & SII to Altec 19 knockoffs
Office:>BH Stat amp to Koss 95x, T20 SET to JBL 4309s
Den:> MorePlay 845 SET to Altec Valencia's