Donner EM1 – Compact In-Ear Monitor Headphone Amplifier for Stage Musicians

Donner EM1 is a compact, analog in-ear headphone amplifier designed specifically for professional musicians. With high-quality analog circuitry and battery-powered operation, the EM1 delivers clear sound reproduction and an impressive battery life of up to 12 hours.

Key Features

• Up to 12 hours of runtime – powered by a 1000 mAh Li-Ion battery, rechargeable via USB-C (5 V/1 A) in about 4 hours.
• Analog circuitry – no digital processing, ultra-low THD&N (0.001%) and 96 dB dynamic range.
• XLR and TRS inputs – automatically detects signal type: XLR (mono, balanced) or 1/4" TRS (stereo, unbalanced).
• 1/8" TRS headphone output – supports headphones with 8–250 Ω impedance. Output impedance: 10 Ω.
• High output power – 125 mW at 32 Ω load, perfect for loud stage environments.
• Compact, lightweight housing – includes a metal belt clip. Size: 103.4 × 41 × 40.7 mm. Weight: only 95 g.
• Charging indicator – red LED while charging, turns off when fully charged.

Performance and Sound

Thanks to its professional specs, the EM1 delivers a clean and stable signal with no audible distortion. The ultra-low noise level (–77 dB A-weighted) and high dynamic range make it ideal for musicians who rely on clear monitor mixes.

Live and Studio Applications

Donner EM1 is suitable for live performances, rehearsals, or studio work. Its portability and independence from mains power make it an ideal choice for drummers, vocalists, guitarists, and bassists using in-ear monitoring.

Technical Specifications

• 1/4" TRS input impedance: 10 kΩ
• XLR input impedance: 20 kΩ
• Headphone output: 1/8" TRS
• Output impedance: 10 Ω
• Max input level: +2 dBu
• Max output power: 125 mW @ 32 Ω
• Dynamic range: 96 dB
• THD&N: 0.001%
• Noise level: –77 dB (A-weighted)
• Current draw: 70 mA
• Battery: Li-Ion, 1000 mAh
• Charging time: approx. 4 hours
• Dimensions: 103.4 × 41 × 40.7 mm
• Weight: 95 g

Materials and Build

The housing is made of durable aluminum that protects internal circuitry. The input jacks are securely mounted to ensure reliable connection. The clip allows safe attachment to clothing or belts.

Included in the Box

• Donner EM1 unit
• USB-C charging cable
• 1/4" TRS to 1/8" TRS stereo audio cable
• User manual

Why Choose Donner EM1?

If you need a compact, reliable solution for in-ear monitoring on stage, the Donner EM1 is your go-to. With strong output power, rugged construction, and excellent sound quality, it’s a trustworthy companion for musicians in any situation.