Behringer – 305 – EQ/Mixer/Output Eurorack Module – Notes
The Behringer 305 is a faithful analog recreation of the Roland System 100M 305 module from the early 1980s. This versatile 24 HP utility combines a 4-band parametric EQ, a 4-channel stereo mixer (with pan and sliders), a built-in tuning oscillator (220/440/880 Hz), master volume control, headphone output, dual master outs (3.5 mm + 1/4″), and signal/clip LEDs—making it an ideal output stage, EQ processor, monitor mixer, or final polish tool for any Eurorack system. Normalled connections (EQ to mixer channel 1, oscillator as “fifth” input) allow instant use, while full patching unlocks creative routing for mixing voices, EQing external signals, or tuning oscillators precisely.
Technical Specifications
| Item | Description |
|---|---|
| Type | Legendary Analog Parametric EQ, Mixer and Output Eurorack Module |
| Eurorack Width | 24 HP |
| Depth | 53 mm (2.1″) |
| Weight | Approx. 0.28 kg (0.62 lbs) |
| Power Requirements | Eurorack bus (10-pin or 16-pin connector) |
| Current Draw | +12 V: 120 mA, –12 V: 100 mA, +5 V: 0 mA |
| Parametric EQ (4-band) | |
| Bands | 4 independent bands (low to high frequency) |
| Controls per Band | LEVEL (± cut/boost), BANDWIDTH (Q: narrow to wide parabolic curve), FREQUENCY (center freq adjustment around marked value) |
| Frequency Range | Full audio spectrum: 20 Hz – 20 kHz |
| Input | 1 × 3.5 mm TS (IN), AC coupled |
| Bypass Switch | EQ/BYP (bypass passes input unaltered to mixer channel 1) |
| Outputs | 2 × 3.5 mm TS (EQ OUT 1/2, parallel, DC coupled), Impedance: 330 Ω unbalanced, Max level: +18 dBu, Noise (flat): < -90 dBu (22 Hz–22 kHz) |
| Indicators | Signal/Clip LEDs (input when BYP, output when EQ) |
| Output Mixer (4-channel) | |
| Inputs | 4 × 3.5 mm TS (MIXER INPUTS 1–4), AC coupled; Channel 1 normalled from EQ OUT |
| Controls | VOLUME sliders (per channel), PANPOTS (stereo placement) |
| Oscillator Input | Internal STANDARD OSC normalled as “fifth” mono channel (adjustable via MIX LEVEL) |
| Tuning Oscillator | |
| Frequencies | OFF / 220 Hz / 440 Hz / 880 Hz (switchable) |
| Level Control | MIX LEVEL (blends osc into mixer) |
| Master Section | |
| Master Volume | MASTER VOLUME knob |
| Outputs | MASTER OUTPUTS: 2 × 3.5 mm TS + 2 × 1/4″ TS (L/R, AC coupled), Impedance: 700 Ω unbalanced, Max level: +8 dBu, Noise (1 ch open): < -100 dBu |
| Headphones | 1 × 3.5 mm TRS stereo (PHONES), Level control (PHONES LEVEL) |
| Additional I/O | |
| Total Patch Points | Multiple 3.5 mm TS for inputs/outputs (EQ in/out, mixer ins, master outs, phones) |
| LEDs | Signal present / Clip per relevant section |
Key Features & Signal Flow
- 4-band parametric EQ — Precise sculpting with level, bandwidth (Q), and frequency per band; bypass for A/B comparison; direct outs for parallel processing or sidechaining.
- 4-channel stereo mixer — Independent volume sliders and pan pots; channel 1 normalled from EQ for seamless EQ → mix flow (break with patch cable).
- Built-in tuning oscillator — 220/440/880 Hz reference tones blendable into mixer—handy for calibrating VCOs, tuning patches, or adding test signals.
- Master output & monitoring — Stereo master volume, dual 3.5 mm + 1/4″ outs (use L/MONO for single output), separate headphone level—perfect final stage for live or studio.
- Classic System 100M utility — All-analog signal path with warm, musical EQ curves; signal/clip LEDs prevent overloads; compact yet comprehensive output solution.
- Normalled & patchable — Default flow: external sig → EQ → mixer ch1 → master; patch freely for multing, external EQ, or mixing multiple voices before output.
- Versatile applications — Final mixdown stage, EQ processor for voices/percussion, headphone monitoring, tuning reference, or utility for small racks needing I/O and tone shaping.
Resources
- Official Behringer product page: https://www.behringer.com/product.html?modelCode=0720-AAM
- Quick Start Guide (PDF): https://notebook.zoeblade.com/Downloads/Documentation/Behringer/305_EQ_Mixer_Output_quick_start_guide.pdf (or search Behringer downloads for “305”)
- ModularGrid page: https://modulargrid.net/e/behringer-system-100-305-eq-mixer-output
- Retailer pages (Sweetwater, Thomann, Perfect Circuit, B&H Photo): Detailed specs, user reviews, demo videos, and sound examples
- Demo videos: Search YouTube for “Behringer 305 EQ Mixer Output” (official demos, EQ sweeps, mixer patching, tuning osc usage)
The Behringer 305 is an essential, affordable all-in-one utility—combining precise parametric EQ, stereo mixing, monitoring, and tuning reference in one module. Perfect for completing a System 100 clone, polishing final mixes, or adding professional output capabilities to any rack. Highly recommended for modular users needing clean, versatile I/O!
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