
Therefore these settings I'm about to give you should work interchangeably well with either the PR40 or RE320. Many times ops discover that the HEIL PR40 and the EV RE-320 are very-very close in frequency response, at least in the realm of Ham rigs and in particular the Kenwood TS-890. And this is why the manufacturer gives us a bit of control over such matters. Or we might compromise, as I do, and set bass roll off around 300 Hz. Heil's lead and set our EQ as he does, and roll bass off much higher, say around 450 Hz. In contrast, if we want to bust the pileup under noisy band conditions, then we MIGHT wanna follow Mr. For example, if we roll bass off at a very low 100 Hz, we will transmit much more bass, with a far more natural, fuller sound. Thus, it all depends on what sort of communications grade audio you desire. I have a couple of them, and they are super clear and articulate, with very little bass response. These are used by the Air Force and other outfits when communicating inside jet planes, tanks, and other noisy situations. The M-133U 5 OHM Military grade microphone has a super thin, narrow frequency response curve, as does the somewhat more normal sounding Electrovoice M-101/AIC military and aviation headset cartridge. then you roll off bass around 400 Hz or higher, and sound like Rudy Valley. Lower frequencies below 500 Hz require 40% of the energy, yet convey only about 5% of speech intelligence - so IF you want to be super clear, intelligible and have your signal go as far as possible.

IF you seek what Bob H calls pileup-busting audio, then you seek a thin, narrow band of speech frequencies. He promotes cutting off ALL the Rich Bass Tones and suggests sounding like Rudy Valley talking through a megaphone.Īnd therein lies the rub.
