Featuring 4 of Maxon’s proprietary MC4107D bucket brigade IC’s, and the world’s first RMS level sensor and companding noise reduction system, the AD-9 Pro delivers 450 millseconds of the most transparent analog delay sound ever available in a stompbox format. Offering improved headroom, the AD-9 Pro can accept any input signal and will work in an amplifier's effects loop as well as its front-end. The AD-9 Pro also features a switchable multi-head tape echo simulator function. This feature provides interesting new delay effects such as the “Ping Pong” repeats made famous by Tape Echo units as well as ambient effects that recreate the echoes of a large concert hall with stunning accuracy. AD-9 Pro is outfitted with mechanical true bypass switching on both wet and dry outputs by use of a 4PDT switch assuring pure, unaltered tone when bypassed. In a world that grows more “digital” by the day, the Maxon AD-9 Pro sets a new standard of analog innovation and audio purity. NOTE ON POWERING THE AD-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 AD-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.   Specifications Input Impedance: 500K Ohms Output Impedance: 10K Ohms Residual Noise: -100 dB or less (IHF-A) Delay Time: 20 mSec to 450 mSec Equivalent Input Noise: 116 dB or less (IHF-A) Controls: Delay Time, Feedback, Delay Level Switch: Single/Dual Mode, Effect Operating Voltage: 9V Power Consumption: DELAY TIME MIN 39mA/DC.9V 38mA/DC.10V Dimensions: 74 mm (W) x 124 mm (D) x 54 mm (H) Weight: 80 grams (including battery) Battery: 9V battery (6LR61 or 6F22) x 1 or Maxon AC adaptor Battery Life: Manganese dry battery more than 2 hours 25deg C / 77deg F (Panasonic 6F22NB) Alkaline dry battery more than 8 hours 25deg C / 77deg F (Panasonic 6LR61G) Option: Maxon AC adaptor (Maxon AC210N for North America) * All specifications are subject to change for improvement without notice or obligation.All brand names and product names are trademarks or registered trademarks of their respective companies.