The PREQ4 is an “all in one” channel strip that updates the PREQ3 module and fits into the standard 500VPR rack. Up to 65 dB of extremely clean gain is available to handle low output ribbon mics and/or very quiet sound recordings for Foley/Film applications that require high gain with a low noise floor.
The PREQ4 front panel starts with separate +48-volt phantom power on/off switch and Phase Reverse (polarity) switches. Next is a switchable -20 dB attenuator Pad that is placed in the circuit just before the input transformer to avoid saturation unnecessarily with an excessively, “hot” microphone signal. Adjacent to the Pad switch is the High Pass Filter In/Out switch. The High Pass filter has a very gentle slope starting at 160 Hz and is -3 dB down at 70 Hz. All four of these switches—the 48-volt phantom, Phase reverse, -20 dB Pad and High Pass Filter all have LEDs to confirm their status.
Just above is the Gain +20 dB range switch that changes the nominal throughput gain range from either 25 to 45 dB over to 45 to 65 dB of gain. The Air Band In/Out switch is next and these two switches also have LED status indicators. Within a dimly lit recording studio, these LEDs are vital to provide an extra level of confidence and confirmation of the PEQ4’s correct setup and operation.
Next is the Gain control with a green LED to indicate signal presence at -20 dBu and a red LED to indicate when the output is near clip at +23 dBu. Above Gain is the Air Band Gain control for up to +12 dB of boost in the Vari Air Band section. There is a 6-position switch for selecting the starting frequency of this shelving equalizer of: 2.5, 5, 10, 20, and 40 kHz.
The PREQ4 is an excellent tracking microphone preamplifier when you desire a pristine and uncolored sounding recording. It provides a choice of extending the high frequencies in a clear and musical way without harshness.
The Maag Audio PREQ4® offers 65dB of gain available making it easy for ribbon mics to fit into any session
The Maag Audio PREQ4® delivers a pristine, transparent signal path
The Maag Audio Air Band® shelf boost from 2.5 to 40kHz



  • PREQ4 Voice without AIR BAND - Gauge ECM-87
  • PREQ4 Voice WITH AIR BAND at 20K - Gauge ECM-87
  • PREQ4 Acoustic Guitar 1 without AIR BAND - AKG C414
  • PREQ4 Acoustic Guitar 1 WITH AIR BAND at 10K - AKG C414
  • PREQ4 Acoustic Guitar 2 without AIR BAND - AKG C414
  • PREQ4 Acoustic Guitar 2 WITH AIR BAND at 10K - AKG C414
  • PREQ4 Snare without AIR BAND - SM57
  • PREQ4 Snare WITH AIR BAND at 2.5K - SM57
  • PREQ4 Kick without AIR BAND - MD 421
  • PREQ4 Kick WITH AIR BAND at 2.5K - MD 421

Special thanks to our friends R Hughes and T Graham at Pro Tools Expert for the sound samples.


Max Gain:65 dB
Frequency Response:-3 dB points, 10Hz & 75kHz
Nominal Input Impedance (XLR):Mic, 150 ohms/1.61K ohms, balanced
Nominal Output Impedance (XLR):50 Ohms, actively balanced
Equivalent Input Noise:-128 dBu (-96 dBu Actual Metered Noise)
Headroom:+27 dBu
Maximum Phase Shift:25°
THD + Noise:< 0.007%
*Specifications subject to change without notice.
**Recommend turning the GAIN fully counter-clockwise before engaging.