Passive Preamplifier? Enlighten me... :)

thats correct, b1 improved sound a lot over passive pre (essence feeding the amp directly).
B1 is not a passive pre. its a pre without gain. a passive pre is without power. pot with input and output connectors and an input selector.

Essence feeding the amp directly is not a passive pre - it is digital volume control.
 
Bought this chinese remote controlled passive preamp. The interesting thing about this is that this is not a motorized pot - It has a ladder network with relays. It's very clicky while changing volume, but works well enough. Also has 4 input selection (one input is an internal BT reciever)

WhatsApp Image 2020-10-04 at 15.36.57.jpeg
 
Bought this chinese remote controlled passive preamp. The interesting thing about this is that this is not a motorized pot - It has a ladder network with relays. It's very clicky while changing volume, but works well enough. Also has 4 input selection (one input is an internal BT reciever)

View attachment 50447
I have the same model.Is it Vol-2 model?
 
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