RockBoard HA 3 Two-Channel Monitor Headphone Amplifier

RockBoard HA 3 Two-Channel Monitor Headphone Amplifier
The RockBoard HA 3 Two-Channel Monitor Headphone Amplifier is a compact, lightweight, tethered monitor solution built primarily for on‑stage musicians who prefer wired in‑ear monitoring or compact headphone mixes, allowing stereo or two separate mixes.

Two-Channel Monitoring
The RockBoard HA 3 In-Ear Monitor Amplifier is the core of a high-quality personal two-channel monitoring system for musicians. This lightweight unit is designed for performers who remain in a relatively fixed position on stage. It provides professional sound quality and a high-volume, high-fidelity signal allowing users to clearly hear a stereo or two separate monitor signals on any stage or in any studio. It can be used with a belt clip or mounted on a microphone stand using the integrated screw-on adapter. The HA 3 can be battery operated and features a status LED that changes color to indicate the remaining battery life. Changing batteries is very simple and quick thanks to the easy-access battery compartment. 

Power Options
When mounted on a microphone stand, the HA3 can alternatively be powered by connecting a regular pedal power supply unit (not included) supplying center-negative 9 VDC. The HA 3 is equipped with two combination input jacks for use with 6.35 mm stereo TRS jacks or XLR connectors. Headphones or IEM are connected to a 3.5 mm stereo jack headphone output. Simply activate the unit with the ON/OFF switch and adjust the desired volume for the headphone signal. Use the stereo/mono source switch depending on your connected audio source(s) and use the balance control to adjust the stereo panorama for your headphones. THis is best suited for in-ear monitors; headphone power may be insufficient for higher‑impedance cans (e.g. DT770 Pro), especially with passive battery only.

Controls
This unit provides:
 - Mono/Stereo Switch: Routes mono signals equally to both ears if needed. 
 - Balance Control: Adjusts left/right mix between the two input channels. 
 - Volume Control: Independent volume slider for headphone output. 
 - Power Control: ON/OFF switch to conserve power when not active. 
 - Battery LED Indicator: LED changes color to show battery level. 

Features:

• Cable-based two-channel in-ear monitor amplifier solution for vocalists, keyboarders, drummers, guitarists, bassists, and other musicians
• Ultra-compact, lightweight design, aluminum housing
• Convenient belt pack format for easy access and reliable connection to source
• Sturdy metal belt clip
• 5/8" and 3/8" mounting adapters for alternative installation on a microphone stand
• Two separate input jacks for separate monitor signals or stereo signals
• XLR/TRS-combo input jacks feature a locking mechanism that prevents accidental disconnection of the XLR cable
• 3.5 mm (1/8") stereo output jack for connecting your favorite in-ear-monitor, earphones or headphones
• Stereo input and stereo output possible
• MONO/STEREO switch to be able to send a mono input signal to both ears
• Volume and Balance controls
• Powered by regular 9 VDC, center-negative pedal power supply (not included) or 9 V battery (not included)
• Easy-access battery compartment
• ON/OFF switch to save battery life when not in use
• LED power indicator
• Dimensions: 102mm (L) × 85mm (W) × 34mm (H)
• Weight: 295g