Purple Audio Pants

A four opamp, differential mic preamp.

The Pants uses a unique dual-bobbin input transformer from Cinemag unlike any other. The smooth Gain control helps you dial in the sound you want. If the output level is too high, you can ride the level down with the separate Level control. Pressing the “High” switch changes the feedback network to provide an insane 78dB of clean gain, a great match for very low output mics.

With different Gain, High mode switch, and Level settings the Pants can produce many different tones with the same amount of output level. The front panel DI goes through a FET buffer into the input transformer, adding an extra dimension to the sound of the preamp.

The DI load switch gives you two options, making it even easier to get the best direct tone for your instrument. Two LEDs clearly indicate signal level for the gain and output stages at a glance, turning green to indicate signal present, yellow for 10dB below clipping, and red for clipping. The Pants uses two KDJ3 opamps and two KDJ4.

Features

• Output level control
• Input and output tricolor LED metering
• Mic / Line switch for rack input Bridging line input for high output mics or line level sources Use with Purple Audio’s Moiyn 8×2 mixer module in the Sweet Ten rack for mic or line mixing
• DI Load switch for front panel input 100kohms or 1M ohms for a more open tone
• Discrete signal path
• Over Current Resettable Fused (prevents any module problem from affecting your rack)
• ROHS – Lead Free

Pants Pinout

• Pin 1: Chassis Ground
• Pin 2: Output A +
• Pin 3: Output B+ (Purple Audio Rack Only – XLR OUT 2)
• Pin 4: Output A –
• Pin 5: Audio Ground
• Pin 6: Output B – (Purple Audio Rack Only – XLR OUT 2)
• Pin 7: Input –
• Pin 8: Input –
• Pin 9: Input +
• Pin 10: Input +
• Pin 11: NC
• Pin 12: +15 or 16VDC 80ma
• Pin 13: Audio Ground
• Pin 14: -15 or 16VDC 80ma
• Pin 15: +48VDC

Specifications

• Maximum output level +33dBu
• Frequency response 10hz – 60kHz +/- 1db
• Transformer input:
  • Mic mode
    • Maximum gain 72dB in normal mode
    • Maximum gain 78dB in high mode
  • Line mode
    • Maximum gain 40dB in normal mode
    • Maximum gain 42dB in high mode
  • Direct input:
    • Mic mode
      • Maximum gain 60dB in normal mode
      • Maximum gain 64dB in high mode
    • Line mode
      • Maximum gain 25dB in normal mode
      • Maximum gain 30dB in high mode