User Manual

SKY6021 50 watt 12-Position Stereo Impedance Matching Volume Control (Ivory)
SKY6022 50 watt 12-Position Stereo Impedance Matching Volume Control (White)
The SKY6021/SKY6022 features high-quality audio transformers, removable and solderless speaker terminals and a
computer grade double-sided glass epoxy printed circuit board. Impedance matching jumpers multiply the impedance
the amplifier "sees" by 2, 4 or 8 times allowing the parallel connection of multiple controls without damaging the
amplifier. 12 level positions provide a maximum of 54dB of attenuation (see attenuation chart below). Each control
includes a metal bracket plate, color-coded plastic insert, color-coded knob, wall plate and mounting screws.
Attenuation (dB)
Volume Knob Positions
Jumper
Position
1 2 3 4 5 6 7 8 9 10 11 12
X2 0 -3 -6 -9 -12 -15 -18 -21 -27 -33 -39 -48
X4 0 -6 -9 -12 -15 -18 -21 -24 -30 -36 -42 -51
X8 0 -9 -12 -15 -18 -21 -24 -27 -33 -39 -45 -54
Impedance Matching Jumpers:
These instructions assume that all system speakers are 8 ohm and all speakers require the same amount
of power.
• Set all jumpers to the same
setting for all controls regardless
of the number of speakers
connected to each control.
• Multiple controls must be wired
together in parallel. The
combined parallel impedance of
all controls must be greater than
or equal to the lowest allowed
amplifier impedance.
• Use the impedance chart below to determine the impedance of each control with various speaker
loads and jumper settings. Find the number of 8-ohm speaker pairs across the top of the chart and
read the impedance at various settings.
• Calculate the combined impedance of all paralleled controls using the following formula:
Where Zt = Combined impedance of all paralleled controls
Where Zx = Single control impedance
Page 1 of 2
0314200