HERITAGE AUDIO HA73EQX2 | Dual Channel Full Rack Microphone Preamp With Equalizer

HA73EQX2

Dual-Channel Mic Preamp with EQ

The HA73EQX2 is a hand-wired, dual-channel mic preamp in the style of a classic '73 unit. It provides that warm, creamy tone associated with the vintage British sound of the 1970s.

Two inputs are on hand for microphones (via XLR connections) and instruments (by means of the front panel 1/4" DI inputs). You can also switch the preamp into line level mode, which is a nice touch for mixing engineers who work primarily—though not entirely—in the box. With this unit, such engineers can lend analog color and EQ to their entire mixes, or to certain select buses.

Part of the original '73's appeal was the EQ section, and the Heritage Audio recreation provides this hand-wired EQ within the HA73EQX2. The EQ offers low-shelving, high-pass filtering, a mid-band EQ, and a fixed 12 kHz high shelf. As for the mic section, you're given all the options commensurate with a high-quality preamp: Phase-reversal, phantom power, a 20 dB pad, impedance switching, and stepped attenuators on the gain stage.

The unit is rackmountable, taking up 2 RU of rack space. 

• 2 x high-impedance DI inputs on front panel
• 2 x 20 dB mic pad buttons, ahead of input transformer
• 2 x 48V phantom power buttons
• 2 x line push buttons switch unit into line mode which makes it suitable as a mix insert for color
• 2 x mic input-impedance switches for 1200-/300-Ohm operation
• 2 x input gain switches, ranging from 30 to 80 dB in 5 dB steps
• 2 x output attenuators, ranging from -infinity to 0 dB
• 2 x polarity inverse buttons
• 2 x EQ bypass switches
• High shelf fixed at 12 kHz
• Bass shelf switchable among 35, 60, 110, and 220 Hz
• Mid peak band switchable among 360, 700, 1600, 3200, 4800, and 7200 Hz (0.36, 0.7, 1.6, 3.2, 4.8, 7.2 kHz)
• High-pass filter switchable among 50, 80, 160, and 300 Hz

Specifications

• Input Impedance
  • Mic High: 1200 Ohms, minimum
  • Mic Low: 300 Ohms, minimum
  • Line Input: 10 kOhms bridging, transformer balanced and floating
• Output Impedance
  • < 75 Ohms, transformer balanced and floating, driving a load of 600 Ohms
• Maximum Gain
  • > 80 dB
• Maximum Output
  • > 26.5 dBu into 600 Ohms (internally terminated)
• THD
  • < 0.025% at 1 kHz
  • < 0.05% at 100 Hz
• Frequency Response
  • 20 Hz to 20 kHz (+0.3/-0.2 dB)
• EIN
  • < -125 dBu
• Noise
  • Output Stage: < 100 dBu
• Power Consumption
  • < 190 mA at 48 VDC
• Rack Units
  • 2 RU

In The Box

• Heritage Audio HA73EQX2 Dual-Channel Mic Preamp with EQ 
• Power Supply
• Limited 1-Year Manufacturer Warranty