Quilter / Bass Block V803

The Quilter Labs Bass Block V803 is an innovative bass amplifier head that combines modern Class-D amplifier design with the warmth of vintage tube sound. With a maximum 800W of power output, it delivers powerful performance in a wide range of speaker environments, from small live shows to large stages.

[Power and Performance]
- 800W high-power output easily drives any speaker.
- High-current Class-D amplifier delivers efficient and dynamic sound.

[3 Amplification Modes (Voice Switch)]
- MODERN: Tight, controlled, solid-state response (similar to the previous Bass Block 800/802, with bottomless limiter).
- WARM: Tube-like output impedance combined with bottomless limiter for a smoother tone.
- Q-TUBE: Tube-like output impedance plus classic tube clipping for vintage overdrive.

[Tone Controls]
- 3-band EQ (Bass / Variable Mid / Treble)
- Four knobs allow for precise tone shaping.

[Connections and Controls]
- Two Hi-Z inputs (FLAT / SCOOP)
- FX loop, headphone output (with built-in cabinet simulation), XLR line out (with cabinet simulation and ground switch)
- GAIN adjusts input sensitivity and drive level, and MASTER adjusts output power to suit your speakers.

[Additional Features]
- Dual Speakon combo jacks for compatibility with a wide range of speakers
- Locking power cable and universal AC power supply for worldwide use
- Line out is uncoupled from MASTER, providing a stable signal regardless of stage volume

[Usability]
- MUTE / ACTIVE / PASSIVE switch (with high-brightness LED indicator)
- FX Return can be used as a stealth input (convenient for playing backing tracks, etc.)
- Headphone output is free-floating in MODERN mode, and automatically switches to cabinet simulation in WARM/Q-TUBE mode

●Specifications
■ Input/Output Connectors
- Input (Flat / Scoop): 1/4"" mono, 2MΩ, 4Vpk (passive), 12Vpk (active)
- FX Loop: 1/4"" mono, 1V full-scale, 1kΩ output, 47kΩ input (FX send disconnected)
- XLR line out (pre-master): Balanced output, 600Ω, -6dB, with ground lift switch
- Headphone output (post-master): 1/4"" TRS, 39Ω (L/R each)
- Speaker output: 4-8Ω, 90V, 25A peak
■ Power supply/output
- Compatible power: 100-240V AC, 50-60Hz
- Power consumption: 500W (average) / 1500W (peak)
- Rated output power (Modern mode)
- 16Ω: 250W
- 8Ω: 450W
- 4Ω: 800W

- Rated output power (Warm / (Q-TUBE mode)
- 16Ω: 250W
- 8Ω: 450W
- 4Ω: 500W

■Dimensions & Weight
- Size: 7.94cm H x 21.59cm W x 19.68cm D
- Weight: 1.715kg

The Bass Block V803 combines the precision of a modern amplifier with the rich resonance of a vintage tube amp. Packed with a rugged design and flexible functionality in a compact enclosure, it's the definitive next-generation bass amplifier.