Here are more information about passive preamps.

• What are the benefits of passive preamps?
• What is better? Poti, switched on resistors or transformer?
• Is the silvercore stepper transformer the best option?

• passicve preamp with our stepper transformer
• 3 RCA plugs
• output can be either symmetrical ground free XLR, or RCA
• the case is optimised for the resonance 

• passive preamp with our 24-step stepper transformer
• 3 input, 2x symmetrical XLR 1x RCA
• output fully symmetricalXLR, or RCA
• different cases optional