The microphones have an on-axis frequency response of 20 Hertz to 20
kiloHertz (+/- 2 dB). For those of you who are using 96 kHz and 192 kHz
sampling rates, you'll be pleased to know that these mics are down only
3 dB at 26 kHz and -10 dB at 40 kHz! The mics are provided with two
detachable protection grids with black screens that fit over the
microphone element. The short one provides flat frequency response from
20 Hz up to 8 kiloHertz; the frequency response then rises to +3 dB at
14 kiloHertz and drops to flat again at 20 kiloHertz. The long one
provides a flat response to 5 kiloHertz and a more severe +10 dB peak at
Sensitivity of the 4061 is 6 mV/Pa; the 4060 sensitivity is 20 mV/Pa.
The microphones are nominally omnidirectional but their pickup pattern
is modified by the absorption and reflection characteristics of your
head and outer ears. Their noise level is as good as microphones of
this type get: 28 dBA for the 4061 and 23 dBA for the 4060. This is
comfortably below the ambient noise level at concerts. The maximum
sound pressure level the mics can withstand before clipping is 144 dB
(134 dB for the 4060) -- this allows for a useful dynamic range in
excess of 115 db!
The HEB microphones require a bias voltage. The HEB "battery box"
contains a nine volt battery, associated electronics (top quality
metallized polypropylene capacitors and 1% metal film resistors) and a
high reliability, locking, US-made, multi-pin jack. The battery box is
roughly half the size of a cigarette pack, made of sturdy die cast
aluminum, and is finished in a durable black crinkle finish. The
battery lasts approximately 300 hours and should be replaced at least
once a year. The output to the recorder is an 1/8-inch (3.5mm) mini
stereo phone plug; other connectors (e.g., XLR, RCA, 1/4-inch Phone) can
be supplied upon request.
Due to different voltage requirements, the HEB battery box is not
compatible with the battery box used with the Core Sound Binaural or
Core Sound Stealthy Cardioid microphones.