Chameleon Labs 7602 MKII Manual de usuario
Chameleon Labs
Model 7602 MKII
Microphone Preamplifier and Equalizer
Owner’s Manual
704 228th Avenue NE, # 826
Sammamish, WA 98074
206-264-7602
www.chameleonlabs.com
Revision A June, 2008
1
Your Model 7602 MKII microphone preamplifier has a
transformer balanced input with a range between 20dB
and 80dB of gain. The separate line input is transformer
balanced and accepts input levels from -20 to +10dB.
The equalizer section is a selectable 3 band design with a
flexible filter section.
The Model 7602 MKII has been carefully constructed and
individually tested for quality. It utilizes pure class ‘A’
circuitry. This unit is made with 100% discrete
components, hand wound transformers and was fabricated
to precisely match vintage counterparts manufactured in
the early to mid 70’s.
The Chameleon Labs Model 7602 MKII is based on high
audio performance design techniques. By employing
classic circuit design, polystyrene capacitors, a gold
contact gain selector and custom wound transformers
Chameleon Labs ensures that the Model 7602 MKII will
exhibit classic audio sound.
Your Model 7602 MKII represents a dramatic
breakthrough in delivering vintage audio performance at
an affordable price.
2
Features of the Model 7602 MKII:
•Fully balanced transformer mic input and output;
•Balanced XLR outputs;
•Hi-Z direct inputs for instruments on the front panel;
•48VDC phantom power selector on the front panel;
•20 position gold contact rotary gain switch for both
Mic and Line sections;
•Output level control functions as a fader when going
straight to tape;
•Oversize power supply provides many times the
current needed for optimum sound quality and will
power two units;
•One-year warranty
3
Front Panel Controls: (Left to Right)
Switch general rule: When the switch is moved toward the function label,
the feature is selected.
Power-
This switch applies power to the unit.(When the optional CPS-
1 is used this switch is inoperative and the power is controlled by the switch on
the CPS-1)
300/1.2K Ohm-
This switch selects the microphone input impedance to
either 300 or 1,200 Ohms.
48V Switch-
This switch supplies 48VDC (Phantom Power) to the
Microphone Input XLR jack.
DI Switch-
This switch routes the Direct Input jack into the unit.
Microphone / Line sensitivity-
This pot controls input level for the microphone and
line inputs. The microphone and line inputs have their
own input connectors on the rear panel and a separate
input transformer. Each rear input has its own section
of the control on the input gain selector switch. The
microphone section provides 20 to 80dB of boost in
4
5dB steps, and the line section provides +10 to -20dB
of adjustment.
EQ Switch-
This switch turns the equalizer section on.
Ø Switch-
This switch reverses the phase of the unit 180°.
Four position LED array-
The first LED indicates that the unit has power turned
on.
The second LED indicates the presence of signal.
The third LED indicates the presence of a +4 dB
signal.
The fourth LED indicates the presence of a peak
amplitude signal.
Filter-
This is a high pass filter with 3dB loss at 300Hz,
160Hz, 80Hz, and 50Hz with an 18dB cut per octave
slope.
Low Equalization -
This section has a shelving slope with four frequency
selections: 220Hz, 110Hz, 60Hz, and 35Hz. This
equalizer affects the selected frequency and all others
below it.
5
Mid Equalization -
This section has a peaking characteristic with six
frequency selections: 360Hz, 700Hz, 1.6k, 3.2k, 4.8k,
and 7.2k. The gain control provides 20dB of boost or
cut.
High Equalization-
This section has a shelving characteristic with five
frequency selections: 16k, 12k, 7k, 4.9k and 3.4k. This
section adjusts the selected frequency and all others
above it. The gain control provides 20dB of boost or
cut.
Output-
Acting as a console fader, this control is placed after the
gain stage and before the output stage. This allows for
trimming of the input signal between the 5dB steps of
the input switch, as well as allowing the input to be
intentionally overdriven. The normal position for this
control is wide open.
6
Connecting the Preamplifier / Equalizer
Audio Connection
Microphone input connections are made with the
female XLR connector on the rear of the unit. This
connector is wired with pin 2 HOT, pin 3 common
and pin 1 is ground (shield). The 48VDC power is
supplied on pins 2 and 3.
The Instrument (DI) connection is made using the
balanced ¼” TRS jack on the front panel. The
connector is wired with the TIP being positive, The
RING being negative and the SLEEVE being ground
(shield).
Line input connections are made with the male XLR
connector on the rear of the unit. This connector is
wired with pin 2 HOT, pin 3 common and pin 1 is
ground (shield).
Output connection is made using the male XLR
connector on the rear of the unit. This connector is
wired with pin 2 HOT, pin 3 common and pin 1 is
ground (shield).
7
Power Supply Connection
The unit is supplied with a country - correct AC
adapter. All DC conversion, regulation and filtering
is done within the 7602 MKII. The output of the AC
adapter is 24VAC and connects to the rear of the unit.
Optionally, you may use the CPS-1 Power Supply to
power this unit. The unit will auto select which
power supply is connected so there is no user
required action.
The CPS-1 uses a 4 pin, screw on type connector to
provide power to run the Model 7602 MKII unit. A
Model CPS-1 power supply is optional to power this
unit. The CPS-1 power supply contains a toroidal
transformer to reduce 60Hz hum. To insure quiet
operation, mount the power supply at least one rack
space away from the Model 7602 MKII main unit,
and locate the AC adapter as far away as is practical.
The Model 7602 MKII does not come with an
interconnecting DC cable that will connect it to one
of the two power outputs on the CPS-1. If you order a
CPS-1 for this unit, please be sure to ask for the DC
cable to be included. A CPS-1 will power two Model
7602 MKII units. Be careful when connecting the
power cable to insure correct mating of the two
connectors. They are keyed and should go in with
very little effort and then screw down for added
safety. If more than gentle pressure is required, it is
8
possible that the plug is misaligned and should be
rotated for a correct fit. DO NOT FORCE the power
connector. The power pin is wired as follows:
Pin 4 is Audio Ground (shield)
Pin 3 is +48 Volts D.C.
Pin 2 is +24 Volts D.C.
Pin 1 is -24 Volts D.C.
9
First time users
Set up of the Model 7602 MKII
1- Select 40 dB on the Microphone / Line sensitivity
control. Turn the Output control fully counter
clockwise. Make certain that the DI, 48V, EQ and
Phase switches are all off.
2- Connect a microphone to the Female XLR plug on
the rear panel. If the microphone requires Phantom
Power, switch the 48V on. The normal position for the
300/1.2K Ohm switch is 1.2K. This matches most
professional microphones used today; if you have
microphones that require a lower impedance you may
toggle the switch to 300. You can toggle between the
selections without damage to the microphones to
determine which impedance performs better for your
application.
3- Connect the male, Line Output XLR connector,
located on the rear panel to the input XLR on your
recorder or D.A.W.
(If you are sending to a device that does not have a gain
control, use the Output control to adjust your signal so
that your loudest signals just fail to reach the maximum
input levels on your recording device.)
10
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