Data Sheet-3
Block Diagram
Application Information
Several interesting things distinguish the AP 13 from other
acoustic preamplifiers.
STEREO ¼" INPUT
Referring to the block diagram above, note the convenience
of having an input switch that automatically reverses the role
of tip and ring on the ¼" Input jack. This saves the trouble of
having to rewire your plug just because it follows one tradition
or another. Next, the three-position Phantom Power (T-Power)
selector switch allows you to choose between 6 volts or 15 volts
DC to power your electret or other condenser pickup. T-Power
is similar to phantom power except only two conductors are
required instead of three (voltage and hot are tied together). This
should cover just about every case – check with the factory for
your mic if in doubt, or read the RaneNote
,
“
Microphones for the
AP 13
”. The Off choice lets this Input accommodate standard
electric guitar type pickups (magnetic coil designs – humbucking
or otherwise). In fact,
either
Input handles this type of pickup
directly, or accepts the line-level outputs of outboard preamps
(belt or instrument mounted).
TUNING
The fixed Tuner Output connects to the piezo processing side
since that is the one that gives the most accurate tuning informa-
tion. This output is not affected by the graphic EQ. The Piezo
Output is similar except located post-EQ and has it’s own Piezo
Output Level control. Neither of these outputs are affected by
the Piezo Level control.
EFFECTS LOOPS
Two different kinds of effects loops live in the AP 13. The
first is the standard Send/Return loop used to mix a wet (pro-
cessed) signal back with the dry (unprocessed) signal. Choose
between stereo or mono Send and Return paths. Individual Send
A/B controls exist along with a ganged stereo Return control.
The second is the direct in-line type known as an Insert. Here all
the signal exits, passes through the outboard processor and re-
enters, all using the same ¼" TRS jack, wired per the Tip=Send,
Ring=Return convention.
EXPANDING & OTHER INPUTS
The Expand Input jacks provide a means for either expand-
ing the AP 13 to allow two instrument use, or as a means to mix
line-level signals with that of the AP 13. Such things as drum
machines and synthesizers often find themselves plugged into
these jacks. Mono or stereo sources may be used.
MAIN OUTPUTS
The AP 13 uses high-current cross-coupled differential
line drivers for each of its balanced outputs. Normal balanced
line-level applications use the ¼" output jacks with 3-wire cable
terminated with ¼" TRS plugs. Unbalanced line-level intercon-
nection uses standard mono ¼" TS plugs without gain change
or signal loss. For direct console connection, the XLR outputs
provide a low-noise mic-level balanced signal.
Architectural Specifications
The Inputs shall contain two channels accomodating both
a microphone and piezo instrument pickup, terminated in a
single ¼" TRS (tip-ring-sleeve) connector. Switchable phantom
power shall be provided for the microphone input. Each input
shall have an overload LED, input trim control, phase invert
switch, low cut filter, seven-band graphic equalizer, pan and level
controls. The main outputs shall implement a stereo level control
and mute switch, terminated in balanced 3-pin.and ¼" TRS
connectors. An output mono switch shall be provided.
Stereo send and return connectors with level controls shall
be provided. A ¼" TS tuner output, ¼" piezo output, ¼" TRS
insert connectors and ¼" TS expand input connectors shall also
be provided. A headphone amplifier shall be built-in with it's
own level control.
The unit shall be a Rane AP 13 Acoustic Preamplifier.
INPUT
INSTRUMENT
SWITCH
TIP/RING
GAIN
PIEZO
TRIM
MIC
GAIN
TRIM
PHANTOM
POWER
(OFF, 6V, 15V)
6-60 dB
6-60dB
GRAPHIC
7-BAND
INVERT
LOW
FILTER
15-250 Hz
EQ ±12 dB
15-250 Hz
7-BAND
GRAPHIC
EQ ±12 dB
FILTER
LOW
OVERLOAD
PZO
PIEZO
OUTPUT
TUNER
OUTPUT
10 dB
OUT
PIEZO
PIEZO
10 dB
LEVEL
R
MIC
OVERLOAD
R
MIC
LEVEL
10 dB
PAN
PIEZO
PAN
MIC
SEND A
0 dB
SEND A
A(LEFT)
B(RIGHT)
SEND B
0 dB
SEND B
RETURN A
RETURN
RETURN B
0 dB
INSERT A
EXPAND IN A
INSERT B
EXPAND IN B
0dB
0 dB
0 dB
0dB
MONO
10 dB
10 dB
HEADPHONES
L
R
B
A
MAIN
10 dB
10 dB
OUT B
OUT A
MAIN
MAIN
OUT
MUTE
OVERLOAD
MAIN
R
6 dB
6 dB
OUT A
MAIN
MAIN
OUT B
40dB
PAD
40dB
PAD
SWITCH
INVERT
SWITCH
+
+
+
+
AP 13
ACOUSTIC PREAMPLIFIER
