Superlux HA1D Headphone amplifier

Portable In-Ear Monitor Amplifier for Live Performance

The Superlux HA1D is a battery-powered personal headphone amplifier built for musicians, vocalists, and worship teams who rely on in-ear monitors during live shows. It clips onto a belt and feeds a clean, dedicated mix from a stage box or mixer straight to earbuds or studio headphones, giving performers a private monitor feed without the bulk of a full rack.

Locking Combo Input and Belt-Clip Portability

What sets this amplifier apart is the locking XLR / 6.3 mm TRS combo jack, which grips the cable firmly so a stage stumble cannot yank the connection loose mid-song. The high-output drive stage delivers enough headroom for high-impedance professional headphones, not just sensitive IEMs.

Signal Path — Inputs and Outputs

One balanced input, one stereo headphone output, and a single volume knob — the signal path is intentionally simple.

• Input: Balanced XLR / 6.3 mm TRS locking combo jack — accepts a balanced or unbalanced line-level feed from a mixer or stage box.
• Output: 3.5 mm TRS stereo headphone jack — drives in-ear monitors and full-size headphones from the same socket.
• Headphone Output Port: Yes — dedicated front-panel socket, no adapter required.

Power — Battery Operation for Cable-Free Stages

Running on batteries isolates the unit from mains hum and ground loops, a common source of buzz in fixed installations.

• Battery Powered: Yes — 2 × AAA cells (sold separately)
• Battery Life: up to 12 hours of continuous use on one set of cells

Controls — One-Handed Operation Mid-Set

Reduced to the essentials, the control surface lets a performer adjust levels by feel without looking down at the belt pack.

• Number of Channels: 2 (stereo) — full stereo monitoring, or summed mono via the front-panel switch.
• Mono/Stereo Switch: Yes — sums a stereo feed to both ears for click tracks or mono IEM mixes.
• Volume Control: smooth rotary knob — wide-range level adjustment without click stops.