When re-designing the CP-9, Maxon looked at every type of compressor on the market and came to one conclusion – standard-grade components and traditional guitar compressor designs simply would not do.

The CP-9 Pro+ runs off of a dual power supply (converted from a single 9V+) giving the pedal twice the headroom and ability to handle compressing/expanding a signal without clipping.

The pedal starts by splitting the input signal into 2 circuits – control and effected.  The control stream makes its way into a THAT2252 chip, a precision RMS level detector (by the “THAT Corporation,” a Silicon Valley manufacturer of high-end precision analog chips) which measures the input signal and provides a precise trigger signal for the VCA.

After the RMS chip we head into a series of 4 Op Amps that are used to control the Threshold, Shape, and Gain of the trigger signal. The affected trigger signal is then routed into a THAT2150 VCA which follows the unity gain amplifier in the effected circuit.

The THAT2150 is a Voltage Controlled Amplifier based on the “Blackmer Gain Cell” developed by David Blackmer, the founder of DBX – This VCA structure is the granddaddy of them all and was instrumental in the early DBX designs.  After the 2150 VCA the signal is amplified again by another Op Amp and then out through the true bypass switch.

The CP-9 Pro+ features Mechanical True Bypass switching using a Fujisoku 4PDT switch.

NOTE ON POWERING THE CP-9 Pro+ – this pedal’s voltage regulator IC requires a high inrush current of approximately 2000 mA upon startup.  When using with a Power Brick such as the Voodoo Labs Pedal Power 2+, this pedal should be connected to a high current power jack when possible.

If it is not possible to connect to a high current jack, you can power the CP-9 Pro+ by leaving a battery in the pedal.  Upon initial start-up, unplug the external DC power input cable, engage the pedal, and then plug the DC power input cable back in – the pedal will now power up normally off the external power supply until you power down your pedalboard.

Input Impedance: 500K Ohms

Input Jack: 1/4 inch standard phone jack

Output Impedance: 10K Ohms or less

Output Jack: 1/4 inch standard phone jack

Output: 1

Switch: Normal/Effect (true bypass configuration)

Maximum Output Level: +18 dBu (1 KHz)

Controls:

THRESHOLD: 0 dBu TO -40 dBu

RATIO: 1:1 to ?:1

GAIN: 0 dB to +30 dB

Distortion Ratio: 0.01% (1 kHz) at 0 dB output

Residual Noise: 95 dBu (input shorted, IHF-A weighted)

Indicator: Normal/Effect LED, Reduction LED (when reduction LED lights, Compression is more than 3 dB)

Internal Circuit Voltage: Stabilized +/-9V DC-DC converter

Power Supply: 9V Manganese dry cell battery (6F22) or special AC adaptor

Power Voltage: DC9 V (Battery) / DC10 V (AC-adaptor)

Current Consumption: 25 mA (9 V) / 23 mA (10 V) at 18 volts

Battery Life:

Panasonic NEO battery 6F22NB

Approximately 5.1 Hours @ 77 deg F / 25 Deg C

Panasonic Alkaline battery 6LF61G

Approximately 12.4 hours @ 77 deg F / 25 deg C

AC Adaptor: AC210N (option) Input: AC120V Output: DC9V/200 mA Center – / Sleeve +)

Dimensions (whole): 74 mm (W) x 124 mm (D) x 54 mm (H)

Weight: 580 g

Accessories: 9V Manganese dry cell battery (S-006P) x 1

Warranty Card: x 1

User’s Manual: x 1