Shown with
included ZM-1G
shock mount.
Description
The Equitek E-350 from Conneaut Audio Devices is a multi-pattern side address microphone designed for professional
recording and broadcast applications. The implementation of high speed, low noise, low distortion electronics makes
the Equitek E-350 the ideal candidate for the most critical applications.
Professional Microphones
Equitek E-350
The Equitek E-350 combines a
vintage capsule design with advanced electronics. Typical FET
(field effect transistor) condenser
microphones use discrete designs. This means they use individual transistors that must be
carefully matched for proper
characteristics. Even with careful matching, discrete designs are
inherently nonlinear. Equitek microphones use a different approach. We do not use any discrete FETs. Instead, we use advanced high speed OpAmps (Operational Amplifiers). These
OpAmps are individually laser
trimmed for optimum performance and have very high gain.
This allows a large amount of
negative feedback to be used to
significantly reduce any non-linearity. During transients, these
OpAmps may require more current than typical phantom power
supplies can deliver. The extra
current demands are accommodated by our unique power supply design. Instead of using phantom power to operate the microphone, we use it to charge a pair
of rechargeable batteries. This
system creates a huge current reserve for the microphone's electronics, yet there is no maintenance involved because the microphone automatically keeps the
batteries charged during use. The
use of OpAmps is not the only
unique feature of Equitek microphones. For example, we also employ servo circuitry to minimize
dc offset and eliminate interstage
coupling capacitors. The bottom
line is we believe you will find
the Equitek E-350 to have a remarkably open and clean sound
that will enhance any project.
Bob Eaton
Senior Microphone Engineer
Made with pride in Conneaut,
Ohio U.S.A.
The Equitek E-350 incorporates a number of unique features including:
Large 1.1" Dual Diaphragm External Bias Condenser Capsule.
Gold Sputtered Diaphragms.
Servoed head amplifiers.
High SPL Capability (148 dB SPL with pad)
Transformerless balanced output circuits.
Internal power reservoir system that can supply ten times the current available from phantom powering
alone.
Remote operation without phantom power using internal batteries.
20 dB non capacitive pad
Stainless steel internal pop/EMI filter.
Switch Functions
Power
Hi-Pass
1 = Microphone Power On
0 = Microphone Power Off (Use this switch
position for fastest charging of batteries.)
Left position = Low end roll off below 80 Hz.
Right Position = Flat low end response.
Pattern
Pad
= Omnidirectional Pattern
= Cardioid Pattern
= Figure 8 Pattern
0dB = Full gain (Highest Sensitivity)
-20dB = 20dB Gain reduction (Highest
Clipping Level)
Getting Started
The E-350 requires 48 volt phantom power and the internal batteries must be charged for proper operation. Although
the internal batteries were charged at the factory, the batteries will gradually self-discharge if the microphone has been
in storage for a long time. It may be necessary to charge the batteries before initial use. Please see the section below on
powering the Equitek E-350.
Caution!
The high gain and wide bandwidth of the E-350 microphone will easily overload the inputs of many professional mixing
consoles if adequate precautions are not taken. This is especially true if the microphone is going to be used on percussion
or amplified electronic instruments. If you have never used this microphone before, we strongly recommend that you
initially reduce the system gain by doing one or more of the following:
Enable the pad switch on the input of your mixing console.
Start with the input trim control on your mixing console turned down to a low level.
Enable the -20 dB pad switch on the E-350 microphone.
Powering the Equitek E-350
The Equitek E-350 is powered by a combination of 48 Volt phantom power and a pair of rechargeable 9 volt batteries.
This powering arrangement overcomes the inherent current limiting associated with most phantom power supplies.
The batteries are trickle charged by the phantom supply. When needed, the batteries provide the extra current necessary
during high SPL transients. The microphone will not function properly without the batteries present. The microphone
can be used without phantom power for periods of up to 6 hours provided the batteries are fully charged. Standard 9 volt
alkaline batteries can also be used if extended operation is needed when no phantom power is available.* (Auto power
shut off circuit must be disabled for battery operation without phantom power.) The minimum requirement for the
phantom supply is a regulated 48 volts with the capability of supplying at least 8 mA. of current. Supplies that do not
meet this requirement will not allow continuous operation of the microphone. Before initial use, the batteries may need
to be fully charged. Once the batteries have received this initial charge, they should not need to be charged in this manner
again, unless the microphone is unused for a long time. The batteries can be charged by two different means:
Connect the microphone to a phantom supply and allow the batteries to charge 12 - 14 hours with the mic
Remove the batteries from the microphone and charge using a standard battery charger.
* See the section on Auto Power Shut Off. IF USING ALKALINE 9 VOLT BATTERIES, DO NOT APPLY PHANTOM
POWER TO THE MICROPHONE! DOING SO COULD CAUSE PERMANENT DAMAGE TO THE MICROPHONE
AND VOID YOUR WARRANTY!
NOTE: If you normally operate the microphone from phantom power, it is best to leave the microphone power switch
in the on or 1 position at all times. (The microphone automatically shuts off to conserve battery power when
phantom power is removed.)
turned off.
Auto Power Shut Off Configuration
The Equitek E-350 incorporates a circuit which shuts the microphone off if phantom power is removed. This is done
so that battery power will be conserved if the user forgets to turn the microphone off. If it is desired to operate the
microphone using only the batteries, this feature must be disabled or the microphone will not function. This is easily
done by means of a small movable configuration jumper located inside the microphone. To gain access to the inside of
the microphone, remove the XLR end cap by first removing the two screws. Then, loosen the screw on the back of the
microphone and slide off the microphone housing. The jumper is labeled JP1 and is located next to the battery holder
on the side of the card opposite the XLR connector. The jumper shorts two of three available pins to select the proper mode. From
the factory, the two pins towards the A are shorted to enable the auto shut off circuit. Two
disable the circuit, pull off the jumper and replace it so that the two pins towards the M (For
manual mode) are shorted. The microphone can be used with phantom power when it is in this
mode, however you must remember to turn the microphone off when not in use or the batteries will
be depleted.
User Techniques and Applications
The Equitek E-350 can be used in a broad number of applications, ranging from live reinforcement to the most critical studio situations. The E-350 is ideal for
vocals and voice overs, yet it also excels at some of the most demanding instrumental projects. The E-350 is great for virtually all acoustic, wind, and amplified
instruments. It will even handle the explosive dynamics of drum kits with ease. The E-350 has been proven to be outstanding in all of these applications and more. Its
uncolored sonic characteristics allow you to decide how a instrument or vocal will sound in the mix.
Specifications
Type:
Frequency Response:
Polar Patterns:
Impedance:
Output Level At 1 kHz.:
Dynamic Range:
Equivalent Noise Level:
Maximum Output Level:
Maximum SPL:
Total Harmonic Distortion:
Signal-To-Noise Ratio:
Capsule Capacitance:
Powering:
Included Accessories:
Optional Accessories:
Side Address, External bias condenser
10-20 kHz
Cardioid, Figure eight, Omnidirectional
Low (200 ohms nominal).
Power Level:
-34 dB (0 dB = 1 mW per 10 microbars).
Open Circuit Voltage:
-55 dB (0 dB = 1 volt per microbar).
17.8 mV/Pascal.
137 dB.
11 dB Equivalent SPL, A weighted
With pad, .89 dBV
Without pad, 8.9 dBV
148 dB SPL (With pad on)
Less than 0.15%
83 dB (At 94 dB SPL)
65 pF
Minimum Requirements are 48 - 52 Volts Phantom Power capable
of delivering at least 8 mA.
ZM-1G ... Shock Mount (See cover photo)
SM-1....... Swivel Mount
WS-1 ...... Foam Windscreen
40-350 ... 50 ft. broadcast quality extension cable terminated with
professional 3 pin male/female connectors
Optema Series, OS-
110 Dual Diaphragm
Condenser Capsule
OS-110 Capsule
The OS-110 condenser capsule is the standard
capsule supplied with the E-350 microphone. OS-110
capsules are produced in a state-of-the-art cleanroom at
our condenser capsule production facility in Conneaut,
Ohio. The OS-110 capsule has the following features:
True large diameter capsule with 1.1" inside diameter.
(1.3" outside diameter.)
3 Micron thick high tension, diaphragms made from
the latest high strength polymer film.
24K Gold sputtered diaphragm coating.
Each capsule is hand adjusted for proper damping and
consistent frequency response.
Other capsule components made from precision
machined brass and stainless steel.
Equitek E-350 Schematic
Equitek E-350 Frequency and Polar Response
Cardioid
Figure 8
A Special Note About Batteries
The high quality rechargeable batteries used in the Equitek E-350 may either
be Nickel Cadmium or Nickel Metal Hydride. They were selected to provide
long life with virtually no maintenance and have a number of properties that
make them superior to most commonly available rechargeable "9 volt"
batteries:
1) Higher output voltage
2) Lower self discharge rate
3) High immunity to overcharging
If the E-350 is operated with a 48 volt phantom power supply it is unlikely
they will ever need to be recharged, even if the microphone is unused for
months. If it should ever become necessary to replace the batteries or if you
simply want a spare set, we suggest that you buy replacements from us.
This is not because we are trying to sell batteries, but because we want you
to continue to realize the maximum performance capability of your Equitek
microphone. Contact the CAD sales department to purchase replacement or
additional batteries.
Re-stringing the elastic cords.
Follow the instructions below if the elastic cords are removed and need
to be remounted:
For the large circular ring use the elastic cord that is formed in a loop.
Omnidirectional
ZM-1G Equitek shock mount
Description
The CAD ZM-1G is a full elastic suspension system for shock isolating
all CAD Equitek cylindrical multi-pattern microphones. The ZM-1G
eliminates mechanical shock interference that is transmitted through the
microphone stand by footsteps, machinery, or other vibration sources.
The ZM-1G also incorporates a built in swivel for ease of microphone
positioning. The ZM-1G attaches to microphone stands with a standard
5/8" x 27 thread.
Mounting a microphone in the ZM-1G
Unscrew the small knurled adapter and rubber ring from the large knurled
knob as shown in Figure 1. Screw the adapter and ring snugly into the
bottom of the microphone as shown in Figure 2. Slide the microphone
into the mount and screw the knurled knob back into the adapter as
shown in Figure3. Make certain that the microphone is positioned as
shown with the microphone connector centered in the opening of the
metal ring. An XLR connector that is inserted into the microphone will
not touch the metal frame of the ZM-1G if the microphone is positioned
properly. The elastic cords in the larger ring should be positioned so that
they fall in the name band area in the middle of the microphone.
Figure 1 Figure 2
Figure 3
1) Using the diagram in Figure 4, start by placing the cord in slot #1.
Position the metal clip on the underside of the ring at this position.
2) Using a "wrapping" motion, stretch the cord and use the number guide
to install the cord.
3) When complete, the elastic should look like the diagram in Figure 5.
4) Adjust the elastic so that there is nearly equal tension on the individual
segments.
For the smaller "C" shaped ring use the short elastic cord that has a small
loop at each end.
1) Look at the diagram in Figure 6 and attach the elastic cord as shown
2) When complete the prongs of the triangular bracket should point
towards the large ring.
POSITION
METAL CLIP UNDER
RING HERE
Figure 4
TWO-YEAR LIMITED WARRANTY
CTI Audio, Inc. (CAD) hereby warrants that this product will be free of defects in material and workmanship for a
period of two years from the date of purchase. In the unlikely event a defect occurs CAD will, at its option, either repair or replace with
a new unit of equal or greater value. You should retain proof of purchase to validate the purchase date and return it with any warranty
claim. Return warranty claims carefully packed, insured and prepaid to the Service Department at the address listed below.
This warranty excludes exterior finish or appearance, damage from abuse, misuse of the product, use contrary to CADs
instructions or unauthorized repair. All implied warranties or merchantability or fitness for a particular purpose are hereby disclaimed
and CAD hereby disclaims liability for incidental, special or consequential damages resulting from the use or unavailability of this
product.
This warranty gives you specific legal rights and you may also have other rights which vary from state to state. Some
states do not allow the exclusion or limitation of incidental or consequential damages or limitations on how long an implied warranty
lasts, so the above exclusions and limitations may not apply to you.
Note: No other warranty, written or oral is authorized by CTI Audio, Inc.
Figure 5
Figure 6
A Division of CTI Audio, Inc. * 341 Harbor St. * Conneaut, OH 44030 * (440) 593-1111 * Fax (440) 593-5395
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