EBS Stanley Clarke Signature Acoustic Preamp. Precision-crafted for upright bass and beyond.

Co-designed with bass legend Stanley Clarke, this 2-channel preamp delivers studio-quality tone, unmatched filtering, and smart flexibility for acoustic instruments—especially upright bass.

Professional-Grade Performance:

Runs at console-level for superior headroom and clarity

Optimized to handle the complex tone of upright bass

Built with premium components for maximum fidelity

Dual Channel Power:

Independent EQ with sweepable mids, bass & treble

Switchable High-Pass or Notch filter per channel for feedback control

Blend or toggle channels—ideal for mixing pizzicato and arco styles

Flexible Inputs:

Works with passive, active, and piezo pickups (10 MΩ impedance)

Channel A supports Electret pickups; Channel B accepts 48V phantom-powered mics or ¼″ inputs

Phase Inverter on Channel A to address blending phase issues

Connectivity & Utility:

XLR out with speaker sim, ground lift, and FOH-ready signal

Effects loop, tuner out, aux in, and pro-grade headphone out

Use in serial or parallel FX mode with a Y-split insert cable

Note: Early units have always-on phantom power—avoid passive ribbon mics via XLR

Also ideal for other acoustic and electric instruments. Electric bassists benefit from two EQ setups and seamless instrument switching on stage.

Features

• Preamp Channels: 2-channel analog preamp (A/B or A+B)
• Signal Quality: Operates with Studio-grade signal quality
• Input Impedance: 10 Mohm Impedance inputs (both channels)
• Filters: Individual High Pass/Notch Filter for each channel
• Microphone Input: XLR microphone-input with Phantom Power (channel B)
• Pickup Support: Electret pickup support (channel A)
• Tuner Output: Yes
• Effects Loop: Effects Loop (serial/parallel)
• Balanced Output: With Speaker Simulator and Ground Lift
• Aux Input & Headphones: Aux Input and professional-grade headphones output
• Power Supply: Dedicated 9V DC Power Supply included

Specs

Channel Specifications: Input Impedance 10 Mohms, 22 pF

Gain: Gain Range -∞ / +30 dB, Gain Peak LED (ch A = RED, B = yellow) +10 dBv,

Frequency Response: +0 / -3 dB 20 – 20,000 Hz

EQ

• Bass Filter: Type Shelving, Gain Range +/- 15 dB @ 40 Hz
• Mid Filter: Type Bandpass Filter, Gain Range +/- 13 dB, Frequency Range 70 – 2,500 Hz, Q 0.8
• Treble Filter: Type Shelving, Gain Range +/- 15 dB @ 10 kHz
• HP Filter: Type 12 dB/octave High Pass, Frequency Range 20 (off) – 450 Hz
• Notch Filter: Type Bandpass Notch, Frequency Range 70 – 2,200 Hz, Q 7, Attenuation 7 dB (typically)

Electret Power (Channel A): 5V, 2mA

Common Features: Effects Loop

Loop Signal Level -10 dBv (nominal), Gain Unity (1:1), Output Impedance 2 kohms, Input Impedance 100 kohms, Modes Serial or Parallel

Phones Out: Recommended Impedance 32 – 200 ohms

Aux Input: Input Impedance 20 kohms, Nominal Level -10 dBv

Output: Output Impedance 1 kohms, Signal Level 0 dBv (nominal)

Balanced Output: Output Level -20 dBv (nominal), XLR Connections 1-GND, 2-Hot, 3-Cold, Options Gnd Lift, SPKR Sim

Balanced Input (Channel B): Input Level -30 dBv (nominal), XLR Connections 1-GND, 2-Hot, 3-Cold, 48V Phantom Yes

Auxiliary Info: Power Requirements Idle 500mA @ 9V, Max 800mA @ 9V (with headphones at max output level)

Dimensions (WxDxH): max 168 x 124 x 53 mm / 6.6″ x 4.9″ x 2.1″

Weight: 660 g (1.5 lbs.)