heil pr40

The Heil PR40 is a large diameter dynamic studio microphone designed for podcaster, broadcaster, home and studio recording, and other sound applications. The PR40 is an end-fire, full-range microphone chosen by ham radio operators. The wide frequency response of the PR40 delivers reliably, and warmth in any situation.

The 1” dynamic element has a low end frequency response down at 28 Hz, a mid-range rise that stays flat up to 18 kHz.  It features a double layered internal pop filtering system that helps to reduce breath blasts by breaking them up and diverts them from hitting the diaphragm directly.

The PR40 was designed for close range use taking advantage of the proximity effect. A recommend 2 inches from the microphone end grill delivers the best results.


The -40 dB of rear rejection blocks unwanted audio from entering the sides and rear of the microphone. This can prevent unwanted fan noise from an amplifier while transmitting. It can also block secondary radio, and other noises in the shack.

A microphone holder (SM-3) is provided wit the microphone that mounts onto any  standard 5/8”- 27 mic thread. The optional PRSM shock mount is available.


  • Padded zipper carrying case and mic clip
  • 3 pin XLR connection
  • Dynamic element
  • 28 Hz – 18 kHz frequency response
  • Cardioid polar pattern
  • -40 dB rear rejection
  • 600 ohms balanced impedance
  • -53.9 dB @ 1 kHz output level
  • Weight: 13.5 oz
  • Max SPL: 148 dB

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Heil PR40 Review

I have used this with 4 radios to date, the 991A, the FTDX 3000, the FTDX 10 and the K4 with great results. The smooth sound mixed with the low end response is nice, but it is often to low for my deep voice. It is an easy fix to roll the low end off to 100, or even 200 without losing any sound quality.

For most people, it will be just right. The 28-18kHz response works well in ham radio, It brings a studio sound to those with receivers that can hear it. A shout out to modern radios! 

The color choices make it an easy fit into any shack. With a -40db of rear and side rejection, it cuts out shack noise. I like that it is end fired, and has built in foam filters. I use this mic with my Youtube channel so it does double duty for me, it sound great there too.

By Vince