Description
RockBoard LM 4 4-Channel Line Mixer for Stage & Studio
The RockBoard LM 4 Four-Channel Line Mixer is a compact, professional-quality line mixer designed to combine up to four mono line-level audio sources into a single mono output. Whether you’re managing multiple keyboards, synthesizers, effects processors, playback devices, or other line-level equipment, the LM 4 provides a simple and efficient solution while preserving excellent audio quality.
Each of the four input channels features its own dedicated high-performance amplifier and independent volume control, allowing precise level adjustment for every connected source. Its low-noise circuitry and premium internal components ensure clean, transparent audio with minimal distortion, making it equally suitable for live performances, rehearsal spaces, home studios, and professional recording environments.
Constructed with a rugged metal enclosure, the LM 4 is built to withstand the demands of touring and everyday use while maintaining a compact footprint that easily fits onto pedalboards, desktop workstations, or live rigs.
Powered by the included 12V DC power adapter, the mixer delivers professional performance with a 95 dB signal-to-noise ratio, 0.009% total harmonic distortion, and a wide frequency response for accurate sound reproduction.
Whether used as a keyboard sub-mixer, effects return mixer, or compact audio routing solution, the RockBoard LM 4 provides reliable, high-quality signal mixing in a portable package.
The Stockist is the official distributor of RockBoard, offering genuine products backed by reliable customer support and warranty.
Key Features
- Compact 4-channel mono line mixer
- Combines four mono line-level inputs into one mono output
- Dedicated high-performance amplifier for each input channel
- Independent volume control for every channel
- Low-noise audio circuitry for professional sound quality
- Excellent clarity across all volume levels
- Rugged metal enclosure for stage and studio durability
- Compact design for pedalboards, desktops, and live rigs
- Ideal for keyboards, synthesizers, effects processors, playback devices, and audio equipment
- Includes 12V DC power supply
Specifications
| Specification | Details |
|---|---|
| Product Name | RockBoard LM 4 Four-Channel Line Mixer |
| Product Type | 4-Channel Mono Line Mixer |
| Inputs | 4 × 6.35 mm (¼”) TS Mono Jack |
| Output | 1 × 6.35 mm (¼”) TS Mono Jack |
| Input Controls | Independent Volume Control for Each Channel |
| Amplifiers | Four Dedicated High-Performance Amplifiers |
| Signal-to-Noise Ratio | 95 dB |
| Total Harmonic Distortion (THD) | 0.009% |
| Frequency Response | +1 dB / -2 dB @ 20 Hz – 22 kHz |
| Power Supply | 12 VDC, 20 mA |
| Power Connector | 2.1 × 5.5 mm Barrel Plug |
| Polarity | Center Negative |
| Power Adapter | Included |
| Enclosure | Metal |
| Dimensions (L × W × H) | 102 × 58 × 45 mm |
| Weight | 182 g |


