The BLACKSTAR UNITY BASS 500 is a powerful and versatile bass amplifier designed to meet the needs of any bass player, offering exceptional tone shaping capabilities and connectivity options for both studio and stage use. Engineered with input from bass players, the Unity Bass 500 combines classic design elements with modern features to deliver a comprehensive bass amplification solution.
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Three distinct preamp voicings: Classic, Modern, and Flat

Unique Response control for shaping compression and dynamics

close up view of Blackstar guitar amp control panel

Three footswitchable drives with user-controllable blend: Overdrive, Distortion, and Fuzz

Built-in Chorus and Sub-Octave effects with adjustable level control

Onboard Compressor for enhanced dynamics control

Input Gain with clip indication for optimal signal levels

close up view of a guitar amp control panel

Pad Switch for active/passive instrument compatibility

Master Volume control for precise volume adjustment

USB audio out for direct recording to your computer or DAW

Series effects loop for integrating external effects pedals

close up view of a Blackstar Unity cab corner with star badge

MP3/Line input and XLR + ¼-inch Line Out/Headphones with independent level control

D.I./cabinet emulated Line outputs for versatile connectivity options


  • Power Output: 500 Watts
  • Speaker Configuration: Custom designed Eminence 2 x 10-inch Opus Speakers
  • EQ Controls: 3-band EQ with semi-parametric Mid
  • Effects: Built-in Chorus, Sub-Octave, and Compressor
  • Response Control Options: Linear, 6L6, and 6550
  • Footswitch Compatibility: Yes
  • Connectivity: Balanced XLR, USB, MP3/Line in, Line Out, Headphones
  • Additional Features: Input Gain, Pad Switch, Master Volume, Link to Unity Bass Series


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