Rane AC 23B (1998 version) - Manual (Page 7)

Manual-7
4-WAY MONO USERS: An internal jumper determines 4 or 5-Way mode. Our apologies: We must ship the units in the
5-Way mode since normal Stereo 3-Way operation demands it: a fact not the least bit obvious, but nevertheless, a fact it
remains. See the section below for Mono 4-Way Jumper Instructions. The HI MID LEVEL control, HI MID MUTE switch,
HI MID DELAY control and HI MID/HIGH FREQUENCY control are out of circuit and will have no effect regardless of
their settings in 4-Way Mode.
ታ Hl MID MUTE switch: Removes all signal from the Hi Mid Output when pressed to the in position. This control is
disabled in 4-Way mode.
ቴ Hl MID DELAY control: This control adds from 0 to 2 ms of time Delay to the Hi Mid Output only. This control is
disabled in 4-Way mode.
ት Hl MID/HIGH crossover frequency selector: This control sets the crossover Frequency between the Hi Mid and High
Frequency Outputs. This control is disabled in 4-Way mode.
ቶ HIGH LEVEL control: This controls the Level of signal to the High Output only.
See the Following Pages for Mono 4- or 5-Way Installation.
IMPORTANT NOTE
CHASSIS GROUNDING
If after hooking up your system it exhibits excessive
hum or buzzing, there is an incompatibility in the ground-
ing configuration between units somewhere. Your
mission, should you accept it, is to discover how your
particular system wants to be grounded. Here are some
things to try:
1. Try combinations of lifting grounds on units that are
supplied with ground lift switches or links.
2. If your equipment is in a rack, verify that all chassis
are tied to a good earth ground, either through the line
cord grounding pin or the rack screws to another
grounded chassis.
3. Units with outboard power supplies do not ground the
chassis through the line cord. Make sure that these
units are grounded either to another chassis which is
earth grounded, or directly to the grounding screw on
an AC outlet cover by means of a wire connected to a
screw on the chassis with a star washer to guarantee
proper contact.
4. Try moving the device away from high magnetic field
sources, such as large transformers used in power
amplifiers.
Please refer to the RaneNote “Sound System
Interconection” for further information on system ground-
ing.
Mono 4-Way Jumper Instructions
1. Be sure all power and audio is turned off. Remove the top
cover of the AC 23B.
2. Locate the 4-WAY/5-WAY jumper by the Channel 2 LOW
and MID OUTPUT jacks (see assembly diagram).
3. Remove the jumper from the 5-WAY (Pins 2 & 3) position
and move it to the 4-WAY (Pins 1 & 2) position.
4. Replace the cover. The AC 23B is now set for Mono 4-
Way Mode. The HI MID OUTPUT will duplicate the MID
OUTPUT frequencies with a different low pass setting as
determined by the HI MID/HI FREQUENCY control, and
is not normally recommended for use since the tweeter
crossover point will be inaccurate.
This operation must be reversed to operate the unit
in either Stereo 3-Way or Mono 5-Way Mode.