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General Description:
The Heil PR 40 represents completely new
dynamic microphone technology designed for a
wide range of professional applications such as
sophisticated recording, live sound, and commercial broadcast. Producing the widest
frequency range available in a dynamic microphone, the PR 40 outperforms most condenser
microphones, and can withstand huge amounts
of SPL. At the same time, it maintains the 25
year Heil Sound tradition of superbly natural
voice articulation.
Since 1982, Heil Sound has been the leading
manufacturer of communications microphones
and has a paramount understanding of phasing.
When properly applied, this knowledge creates
outstanding cardiod patterns with unbelievable
rear rejection that removes unwanted sounds
that try to enter from the off axis rear. The
pattern control of the Heil PR 40 is outstanding.
This exceptional performance is achieved by
using the ideal combination of materials for the
large low mass diaphragm and a special mixture
of neodymium, iron, and boron that gives the PR
40 the strongest magnet structure available.
These features allow the microphone to achieve
magnificent dynamic range. A unique screen
system using two different diameter mesh
screens and an internal breath blast filter allow
the user to talk
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closely to the microphone with little worry of
pops or excessive sibilance. The large diameter
dynamic element is mounted in a unique sorbothane shock mount atop a non-resonant fixture,
decoupling the element from the massive steel
body. This body and the internal hum bucking
coil removes any worry of using the PR 40 near
monitor screens or noisy lighting fixtures and
controls. The new technology of the Heil PR 40
has redefined the dynamic microphone with
superior wide frequency response, the lowest
presence of noise in the industry, flawless
design, and elite quality expected by an innovator and leader in the field. Welcome to the new
standard.
Engineers’ Specifications:
Dimension Drawing:
2 1/16”
6 11/16”
PR40
1”
A high performance microphone shall bring new
large diameter technology to the industry. It
shall have a personality in it’s wide frequency
response of 28 Hz. to 18 kHz. at the –3 dB
points. The traditional Heil Sound ‘bouquet’ of
mid range articulation will be featured which will
bring gorgeous speech and instrument reproduction without the use of outboard equalization. A high degree of phasing plug assembly
shall reduce the rear rejection typically at –18
dB or better. A large 1 1/8” diameter low mass
voice coil assembly with a specially treated
diaphragm that can create large dynamic levels.
A special blend of neodymium, iron and boron
will produce the strongest of magnet structure
for this high performance microphone. Nominal
impedance shall be 600 ohms. The proximity
effect which is present in all cardiod microphones will be properly eliminated in the design
of this new microphone. By controlling this bass
boost effect, this microphone will be the most
ideal microphone for use inside kick drums, for
close up guitars and will be the summit for tight
vocals and broadcast studios. There shall be a
hum bucking coil to eliminate hum and noise
when used near a cathode ray tube monitor or
around high EMF levels. The case will be
created in steel, finished in anodized, nonreflecting champagne matte color. The microphone shall have a maximum diameter of 2
1/16“ with a length of 6 11/16”. A cast zinc
adjustable 5/8” – 27 stand adapter lined in
Teflon will be supplied . The new dynamic technology from Heil Sound shall be named the PR
40.
Wiring Diagram:
3
2
1
Frequency Response:
Decibels Sound Pressure Level
20
50 100 200
Frequency, Cycles per second (hertz)
500
hum buck
1000 2000 5000
10000
20000
20
10
0
-10
-20
-30
Decibels, Arbitrary Units
Heil Sound Ltd.
5800 North Illinois
Fairview Heights, IL 62208
618-257-3000 618-257-3001 fax
www.heilsound.com
For information contact
For orders contact
For technical support contact
618-257-3000
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