HA-73 EQX2 - Uncategorized Heritage Audio - Free user manual and instructions
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| Product Type | Dual-channel microphone preamplifier with equalizer |
| Model | HA-73 EQX2 |
| Number of Channels | 2 |
| Inputs | Balanced XLR microphone input and line input per channel |
| Outputs | Balanced XLR line output per channel |
| Equalizer Type | 3-band inductor-based equalizer (low shelf, mid peak, high shelf) |
| Frequency Response | 20 Hz to 20 kHz, plus or minus 0.5 dB |
| Power Supply | 100-240 V AC, 50/60 Hz, internal linear power supply |
| Dimensions | 483 mm width (19-inch rack), 88 mm height (2U), 250 mm depth |
| Mounting | 19-inch rack mountable, 2U height |
| Weight | 5.2 kg |
| Gain Range | +20 dB to +70 dB |
| High-Pass Filter | Switchable 50 Hz, 12 dB per octave |
| Output Level Control | Continuously adjustable -10 to +10 dB |
| EQ Bypass | Single switch to engage equalizer section |
| Construction | Solid steel chassis with protective rack ears |
| Cooling | Passive, no moving parts |
| Operating Temperature | 10 to 35 degrees Celsius |
| Maintenance | Clean exterior with a soft, dry cloth |
| Safety Rating | CE-compliant, Class I grounded power supply |
| Repairability | Modular PCB design allows easy service and replacement of parts |
| Included Accessories | Power cable, rack screws, user manual |
| Warranty | 12-month limited warranty |
Frequently Asked Questions - HA-73 EQX2 Heritage Audio
How do I connect a microphone to the HA-73 EQX2?
Connect a balanced microphone to the XLR input on the rear panel. Set the gain to 0 and gradually increase it until the desired level is achieved. Use the high-pass filter to cut low-frequency rumble.
Can I bypass the equalizer without turning off the preamp?
Yes, the HA-73 EQX2 features an EQ In/Out switch. Pressing this switch bypasses the entire equalizer section while keeping the preamp active, allowing you to compare processed and unprocessed audio instantly.
What is the proper power-up sequence for the unit?
Plug the unit into a grounded AC outlet and connect all input and output cables. Turn on the power switch on the front panel. Allow the unit to warm up for a few minutes before sending audio through the signal path.
How should I clean and maintain the HA-73 EQX2?
Use a soft, dry cloth to wipe the front panel and enclosure. Do not use solvents, abrasive cleaners, or compressed air. Avoid letting any moisture into the chassis, and keep the airflow vents free of dust.
What is the recommended gain structure for the best signal quality?
For lowest noise, set the output level to unity gain and adjust the input gain so that the signal peaks near 0 dB on your mixer or interface. Avoid excessively high gain settings, as they can introduce background hiss.
Does the HA-73 EQX2 have a built-in power supply?
Yes, it includes an internal linear power supply with a standard IEC power connector. It accepts 100-240 V AC, making it suitable for use in most countries without external converters.
Can I rack-mount the HA-73 EQX2 together with other units?
Absolutely. The HA-73 EQX2 is designed as a 19-inch rack unit with 2U height. It occupies a single rack bay, allowing you to install other hardware in adjacent bays for a clean and professional setup.
How do I use the high-pass filter effectively?
The high-pass filter is a switch that attenuates frequencies below 50 Hz at 12 dB per octave. Engage it to eliminate wind noise, handling noise, or low-frequency rumble from microphone recordings without affecting the useful audio range.
What are the maintenance requirements for long-term performance?
This unit requires no special maintenance beyond periodic exterior cleaning. Keep the rack vents unobstructed and ensure proper airflow for passive cooling. If the unit is not used for a long time, store it in a dry, dust-free environment.
Is the equalizer in the HA-73 EQX2 active or passive?
The equalizer uses discrete inductors and capacitors in a passive topology, followed by a class-A amplifier to make up for insertion loss. This design faithfully reproduces the warm, musical character of classic 1073-style equalizers.
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USER MANUAL HA-73 EQX2 Heritage Audio
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Product information
Brand : Heritage Audio
Model : HA-73 EQX2
Category : Uncategorized