User`s manual

JR4 • Quad Microphone Preamplifier
INTRODUCTION: Four DC-Coupled, transformerless preamplifiers. Ideal for ribbon,
dynamic and tube microphones. Also useful as DI preamp, Passive EQ/Compressor gain
make-up, etc. Outstanding imaging and ambiance retrieval. Ultra-Low noise. Virtually
overload proof. All unnecessary features and components omitted for signal path purity.
DC POWER INPUT: A single 5-pin male XLR connector is located on the rear panel. Use
in conjunction with a Pueblo Audio DC power cable to connect the PS34 power supply.
WARNING: Do not modify or make dc power cords that split, mult, or ‘y’
power distribution. Do not power from third-party products, damage may
occur. Only designed for use with Pueblo Audio products.
MICROPHONE INPUT: Female XLR. DC-coupled, 3,000Ω balanced input. Protected
against phantom power faults. Capable of accepting line level signals. The input is
virtually overload proof, eliminating the need for pads. Pin 2 is non-inverting (+/hot), Pin
3 is inverting (-/cold).
MAIN OUTPUT: Male XLR. DC coupled, 100Ω balanced output. Symmetrical signal
drive. Capable of driving a 10,000Ω load to +29dBu, or 600Ω to +27dBu, before
distortion rises. Will drive hundreds of feet of cable. Pin 2 is non-inverting (+/hot), Pin 3
is inverting (-/cold).
AUXILIARY OUTPUT: 1/4” TRS jack. DC coupled, 100Ω impedence-balanced (aka
quasi-balanced). Single-ended drive on TIP of jack. 6dB less gain than the Main Output.
This is an independently buffered output, not a ‘mult’ from the Main output.
If a Tip-Ring-Sleve (TRS) 1/4” plug is inserted, an impedance balanced connection
is formed. This allows the common mode rejection (CMR) of a differential receiver to reject
noise and emi. If a Tip-Sleve (aka TS or mono) plug is inserted, then a traditional
unbalanced connection is formed.
POWER INDICATOR LED: Light emitting diode on left of front panel indicates unit
power status: