HX-3 Headphone Distribution Amplifier User Guide and Technical Information Sound Devices, LLC 300 Wengel Drive • Reedsburg, WI • USA +1 (608) 524-0625 • fax: +1 (608) 524-0655 Toll-Free: (800) 505-0625 www.sounddevices.com support@sounddevices.
HX-3 User Guide and Technical Information General Description The HX-3 from Sound Devices is a portable, stereo headphone amplifier designed for critical audio monitoring. The audiophile-quality headphone amp is ideal for adding headphone feeds for portable and studio applications. The HX-3 provides three independent headphone feeds from balanced or unbalanced, line sources. Each headphone output has its own level control, peak LED, and ¼-inch output connector.
HX-3 User Guide and Technical Information Specifications Frequency Response: Voltage Gain: 10 Hz – 50 kHz, +/-1.0 dB, any input to any output, gain control set to 50% Gain Loop Out Headphone Output (1,2,3) Bal. Line –3 dB 34 dB HP Input –1 dB 35 dB Output Clipping Level: +18 dBu minimum with 600 ohm load +16 dBu minimum with 300 ohm load Headphone Output Impedance: 200 ohms Input Clipping Level: XLR: +24 dBu minimum Dynamic Range: (Balanced line inputs) 120 dB minimum THD + Noise: 0.
HX-3 User Guide and Technical Information Front Panel Controls 1 3 1. Stereo/Mono Switch Sums stereo and two-channel audio program to mono for mono headphone monitoring. 2. Headphone Gain Controls Volume of each headphone output. 3. 4 2 Headphone Peak LED Illuminates 3 dB before clipping to indicate onset of headphone distortion. 4 5 4. POWER LED Bi-color LED illuminates green when the unit is powered and changes to red when approximately four hours of battery life remain. 5.
HX-3 User Guide and Technical Information Input Panel Connectors 1 3 2 1. XLR Line Inputs Line level, balanced inputs. 2. ¼-Inch and 1/8-inch Tape Level Inputs Unbalanced, stereo, Tip-Ring-Sleeve inputs. 3. Loop Output Output connection enabling interconnection of multiple HX-3’s. Loop Out is T-R-S, unbalanced stereo connection. Output Panel Connectors 2 1 1. HEADPHONE OUTPUTS Panel mounted headphone jack for each output. Output 1 has 1/8-inch jack in parallel with ¼-inch jack. 2. 3.
HX-3 User Guide and Technical Information Operational Notes Headphone Outputs The HX-3 uses independent drive circuits for each of its three isolated headphone circuits. Because of the bi-polar power supply, the HX-3 can provide high levels of power to each headphone feed. The HX-3 is capable of driving headphones to dangerous levels. Take precautions to prevent hearing damage.
HX-3 User Guide and Technical Information Connection Diagrams The HX-3 can be used in a variety of headphone applications. Below are a few examples of interconnection setups using the HX-3. Mixing Console Monitor L Monitor R One or more units can be added and “daisy-chained” for additional headphone feeds from a mixing console. Loop additional HX-3 amplifiers with the included Link cable. The headphone outputs of portable audio electronics can be connnected to the HX-3 for additional headphone feeds.
HX-3 User Guide and Technical Information CE Declaration of Conformity According to ISO/IEC Guide 22 Sound Devices, LLC 300 Wengel Drive Reedsburg, WI 53959 USA declares that the product, HX-3 is in conformity with and passes: EN55103-1, (1997) Emissions standard for product family audio devices for professional use EN55103-2, (1997) Immunity standard for product family audio devices for professional use EN55022 (1995)/ CISPR22 (1997) Radiated and Conducted emissions, Class B EN61000-4-2 (1997)/ IEC
HX-3 User Guide and Technical Information FCC Statement This device has been tested and found to comply with the limits for a class B digital device, pursuant to part 15 of the FCC rules. These limits are designed to provide reasonable protection against harmful interference in a residential installation. This equipment generates, uses, and can radiate radio frequency energy and, if not installed and used in accordance with the instructions, may cause harmful interference to radio communications.
HX-3 User Guide and Technical Information- Printed in U.S.A.