Black Lion Audio B173 Quad 4-Channel Preamp with Mic and DI Inputs

Product #81739 | SKU B173 QUAD | Black Lion Audio
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  • For Engineers Who Prefer the '73 Sound
  • Warm, Creamy Sound
  • 4 x Mic Inputs, 2 x 1/4" DI Inputs
  • Up to 70 dB of Gain
  • Input & Output Gain Attenuators


Designed for recording engineers who want an updated take on the classic '73-style unit, the Black Lion Audio B173 Quad 4-Channel Preamp with Mic and DI Inputs is a four-channel preamp with a warm, creamy, 1970s tone. It's suitable for recording vocals, keyboards, guitars, basses, and more.

This preamp gives you four channels in a 2-RU package. XLR connections on the rear of the unit correspond nicely with your microphones, while you can plug any electric bass, guitar, or keyboard into one of its two 1/4" DI jacks. To better correspond with a variety of downstream gear, both XLR and 1/4" outputs are provided. Each output can be run in parallel, should you need to divert a single output to two different sonic destinations.

All four channels offer up to 70 dB of gain. Each channel sports its own phantom power switch for condenser microphones, as well as a polarity-reverse selector. A Hi-Z switch on two channels lets you choose between the mic and DI input. Gain and output knobs allow you to fine tune the level of each instrument; if you wished, you could drive the signal hard with the gain knob for a harmonically rich tone, then lower the output knob to avoid clipping your digital convertor downstream.

The B173 Quad employs Cinemag transformers on both the input and output stages, ensuring a warm, meaty tone. Output metering is made possible via four metres. A power supply is included.


Input Level Microphone: +1 dBu maximum
DI: +18 dBu maximum
Gain Microphone: +12 to +70 dB
DI: Up to +25 dB
Impedance Microphone: 200 Ohms
DI: 1.1 MOhms
Phantom Power 48 V, selectable
Polarity Reverse 180°, selectable
Hi-Z Switchable on 2 channels
Controls 4 x gain knobs
4 x output knobs
2 x Hi-Z seletors
4 x phantom power selectors
4 x polarity-reverse selectors
Connections Microphone: 4 x XLR
DI: 2 x 1/4" / 6.3 mm, phone type
Equivalent Input Noise Microphone: -105 dBu
DI: -100 dBu
THD+N Microphone at +4 dBu Output:
  • 0.04% at +8 dBu
  • 0.05% at +25 dBu
  • 0.06% at +40 dBu
  • 0.08% at +55 dBu
  • 0.21% at +66 dBu

DI at +4 dBu Output:
  • 0.021% at +10 dBu
  • 0.016% at +20 dBu


Bandwidth Microphone: 10 Hz to 30 kHz (1 kHz, 150-Ohm source, unweighted)
DI: 10 Hz to 30 kHz (1 kHz, 600-Ohm source, unweighted)
Output Level +28 dBu maximum
Output Impedance 600 Ohms
Connections 4 x XLR
4 x 1/4" / 6.3 mm
Rack Space 2 RU
Dimensions Not specified by manufacturer
Weight Not specified by manufacturer

In The Box

  • Black Lion Audio B173 Quad 4-Channel Preamp with Mic and DI Inputs
  • Power Supply


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  • Product: Black Lion Audio B173 Quad 4-Channel Preamp with Mic and DI Inputs
  • Manufacturer: Black Lion Audio
  • Model: B173 QUAD
  • SKU: B173 QUAD
  • RM Product #: 81739

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