Van Alstine rev 2 ABX Switch Manual - page 4
Vol up/dn: Adjusts both left and right volume up/down. The longer the switch is held depressed, the faster
the volume will change.
Chan up/dn: Adjusts either the left or the right volume up/down. The longer the switch is held depressed,
the faster the volume will change. The side that changes volume is pointed to by an arrow on the display.
This arrow is changed by pressing the “prev ch” button.
Prev Ch: toggles which side responds to the chan up/dn volume adjustment. The current selected side is
pointed to by an arrow on the display.
Mute: toggles mute on and off. When in “mute” mode, the display reads “MUTE”. If no sound is coming
out of the ABX switch and you can’t figure out what’s wrong, check that it is not in mute mode (experience
talking here). All volume setting are fully adjustable when in mute mode.
1: Selects A source
2: Selects B source
3: toggles source (if A source is active, pressing “3” will make B source active).
4: Selects A amp
5: Selects B amp
6: toggles amp (if A amp is active, pressing “6” will make B amp active).
7: Selects A speaker
8: Selects B speaker
9: toggles A and B speaker. If C or multiple speakers are selected, “9” does nothing.
0: Selects C speaker
Multiple speaker selection: The ABX Switch allows up to two speaker systems to be selected at the same
time. Simply press the speaker selection buttons (7, 8, and 0) within 2 seconds of each other. The ABX
Switch will not allow 3 speaker systems to be selected at the same time.
Enter and Input: These are the two keys that define the two systems that the ABX switch operates on when
in blind test mode. Pressing “enter” or “input” will change to the “enter” or the “input” system. Pressing
“on-off” followed by “enter” or “input” will take the current settings of the ABX switch and save that as the
“enter” or “input” system.
“play”: toggle subwoofer enable. If subwoofer is turned on, “SUB” is displayed in the middle of the
display. For mode details see the subwoofer section.
Subwoofer:
When no subwoofer is used, the 2 RCA jacks “SUB OUT” are left open. There is still a line level signal,
from the selected amp, on the “SUB OUT” RCA jacks but it doesn’t drive anything. Connecting a line level
subwoofer “plate” amp to the “SUB OUT” RCA jacks will connect a subwoofer to the system. No
previsions are made for connecting a subwoofer at speaker level. Many subwoofers have a high level output
that is used to drive the main speakers. Usually this output has some of the lowest frequencies attenuated by
a 6 db/octave high pass filter (a capacitor). The ABX switch cannot use this output, but has this filter
duplicated internally and it can be used or by-passed via the “play” button on the remote. The full range
output of the selected amp will drive the selected speakers if sub is not enabled, if sub is enabled an internal
6 db/octave filter keeps the lowest frequencies from reaching the selected speakers.