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.
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.
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. PowerThis switch applies power to the unit. (When the optional CPS1 is used this switch is inoperative and the power is controlled by the switch on the CPS-1) 300/1.2K OhmThis switch selects the microphone input impedance to either 300 or 1,200 Ohms. 48V SwitchThis switch supplies 48VDC (Phantom Power) to the Microphone Input XLR jack.
dB steps, and the line section provides +10 to -20dB of adjustment. EQ SwitchThis switch turns the equalizer section on. Ø SwitchThis switch reverses the phase of the unit 180°. Four position LED arrayThe 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.
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 EqualizationThis 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.
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).
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.
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.
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.
4- Turn the Output control clockwise until you can see level on the input of your recorder. Increase until the desired level is achieved. (Vintage Hint: Adjusting the Microphone / Line sensitivity control along with the Output control can provide a variety a different sounds by overdriving the amplifier circuits while lowering the final output level in order to not overdrive the recorder.) 5- If you wish to connect the equalizer section to the line output of your board or D.A.W.
9- When the optional CPS-1 is used the POWER switch is inoperative and the power is controlled by the switch on the CPS-1.
Warranty and Liability Your Chameleon Labs product is warranted to the original owner for a period of one year. Chameleon Labs guarantees this product to be free from electrical and mechanical defects and will repair or replace defective components, or replace the microphone at Chameleon Lab’s option. Should service be required for your Chameleon Labs product, please contact the manufacturer. Service is provided for products beyond the warranty period.
MODEL NUMBER ___________________________ SERIAL NUMBER ____________________________ DATE OF PURCHASE __________________________ PURCHASED FROM ___________________________ Specifications Input impedance: Microphone – 300 or 1,200 ohms Line – 10,000 ohms D.I. – 100,000 ohms Sensitivity: Microphone – -80dBm to -20 dBm in 5dB steps for 0 dBm output. Line – -20 dBm to +10 dBm in 5 dB steps for 0 dBm output.
-46dBu with final output stage at unity EIN -126 dBu; -56dBu without final output stage EIN -136 dBu. Controls either “flat” or switched out. Output: Balanced and floating to feed a 600 ohm load. Maximum output +26 dBm into 600 ohms, or +20dBm into 150 ohms. Output impedance: 600 ohms, balanced (source impedance 75 ohms). Frequency Response: 11 Hz – 77.65 kHz – 3 dB. Level variation is less than 0.2%. Distortion: 1k Hz = 0.
