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I have a Heil PR 40 which developed a hum and was sent back to Heil where a loose ground wire was repaired free. I had purchased ART, Steinberg and Alesis low end amps and I thought the hum was from the amps. I then purchased the GAP PRE 73II and the hum still appeared. I thought the Heil couldn't possible have a hum, but I was wrong, but I'm glad I was wrong as the GAP Pre 73ii gave the dynamic Heil PR 40 a lot of strength. Also while the PR 40 was away I purchased the Senn MK4 and boy did it sound great on my GAP pre, and was warmer than the PR40. But I needed to put some acoustical material around my mic station and that helped considerably to keep down the echo of the room. I think the sound from the MK4 is warmer and will probably use it for my podcasts instead of the PR40. But time will tell and maybe an update later.

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