VC220pmi

POWERMATCH™ Digital Volume Controller

• Stereo volume can be controlled by keypad or remote control.
• Two-piece speaker level digital stereo volume control with mute and LED status.
• 17 positions of attenuation to -48dB.
• High power handling 200 watts peak, 100 watts RMS continuous.
• POWERMATCH™ topology allows safe connection of up to six controllers to one amplifier without a stereo interface.
• Premium Transformer-Free™ sound quality.
• Silent start™ logic (installer defeatable) allows control to start muted, then when activated in position six or 12.
• Modern styling available in white, almond and ivory.
• One or two VC201 keypads with or without internal infrared receivers can control each VC220pmi.

For more than 20 years Knoll has been the world leader in premium sound quality volume controls and stereo interfaces. The VC220pmi can be controlled by either a keypad or remote control. The VC220pmi continues the tradition by providing the best balance of high power handling capacity, modern styling and functionality, V-pad Transformer-Free™ sound quality with installation ease for stereo systems, home theater, multi-room custom installation and commercial applications.

The VC220pmi features silent start™ logic (this can be installer defeated in some or all rooms). When the stereo receiver is first turned on, the speakers may remain silent (a red color LED glows on the VC200 or the lower green LED on the VC201). Push the keypad rocker switch, the LED glows green and the sound turns on to the level selected by installer (in this room only). The silent start™ feature prevents stereo sound in rooms requiring privacy (bedrooms, sitting rooms, etc.). Whenever the VC220pmi is first turned on with the stereo system, it reverts (after start mute, if this was selected) to the installer selected start level, regardless of the level it was at when the system was shut down. VC220pmi's can be mixed and matched with conventional volume controls in any installation.

The VC220pmi V-pad design does not generate heat like a transformer or L-pad that can dissipate large amounts of power in low and off positions creating early failures, wall damage or even a fire hazard. Nor is there any sonic degradation at low operating levels. Instead the VC220pmi presents the listener with a full frequency response and original dynamic range at all volume positions and power levels. The stereo signal passes to the speakers without the compression effect associated with all transformer volume controls.

Knoll V-pad Transformer-Free™ technology is the best and most reliable solution for new construction, renovations and upgrades of existing stereo systems.

The VC201 keypad design has a smooth 17 position action with a modern rocker switch to match virtually any modern decor. Keypads are available in white, bone and almond. To increase the volume, press the "up" rocker. To decrease the volume, press the "down" rocker. To mute the volume, press the center of the rocker. When in mute, the LED blinks. To restore the volume press the rocker anywhere. To avoid the blinking lamp, press and hold the "down" rocker until the keypad is in the lowest position. In the lowest position the volume control mutes without a blinking LED lamp.

The VC220pmi is a two piece system consisting of a VC201 keypad or VCI28 computer interface and a VC220pmi controller. The controller is usually located in an electrical room, low voltage panel, closet or near the stereo. From one to three VC201 keypads can be connected to each VC220pmi. The keypad is connected to the controller with conventional cat 3 or cat 5 telephone wire. The VC201 keypad is available with and without internal infrared receivers that don't need extra wiring. The VC220pmi controller is identical to the VC220pm (which cannot be controlled by a remote control). The stereo's speaker outputs are connected to from one to six VC220pmi controllers (with speaker wire) and the controllers are connected to the speakers (again with speaker wire). VC200 keypads do not work with VC220pmi controllers.

VC201 Keypad	RB8 Remote Control

VC201i keypads with internal infrared receivers are recommended for use with the VC220pmi when remote control use is required in any room. The infrared receivers will also work with most other brands of electronics to pass signals from rooms to the stereo, CD player etc. No extra wiring is required.

Fig 1. Volume Control Frequency Response

With identical paralleled inputs and 8 ohm output loads, the -11 dB attenuation output frequency response of a Knoll Transformer-Free™ versus a top-of-the-line major brand autoformer volume control is shown.

Specifications:

VC220pmi Controller

VC221 Keypad

Note: Keypads do not include single or multi-gang cover plates.

Wire Requirements:

Speaker wire for the VC220pmi should be copper, 14 to 18 gauge. Runs longer than 33' (10m) should be minimum 14 gauge wire. We suggest using fire rated wire whenever possible. Two wire pairs (left and right) are run from the stereo amplifier, receiver or stereo interface to the VC220pmi controller, then a wire pair continues to each speaker. When "pre-wiring", leave an extra 3' (1 m) at each end to allow easy component installation.

A home run of 8 conductor cat 3 or cat 5 wire is run from each keypad to the VC220pmi controllers. If the VC220pmi(s) are not located with the stereo equipment, we suggest running a single cat 3 or cat 5 wire from the VC220pmi location to the stereo for power, IR signals and IR power (one wire for up to six VC220pmi's). For further information click here for VC220pmi INSTALLATION INSTRUCTIONS . A single 12 volt DC power supply (such as the PS1202) needs to be located at the stereo receiver and plugged into the receivers switched outlet.