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7
10
13
17
21
26
31
36
41
Input Impedance:
45
Ω
10 k
51
56
Mic Input
1
2
3
Phantom
On / Off
RPQ500
Single Line
API 500 series preamp
with
Minimum path, high gain and impedance, fast transient recovery JFET preamp
cables can cause absence of signal which, as Richard Heyser once com-
mented, is 100% distortion. Even more potentially damaging, defective
cables can cause loud "pops" or other noises, which if the level is high
can launch loudspeaker cones across the room.
Line Input Mode
The P48 Phantom Power cannot and should not be applied to line-level
devices. In Line Input Mode the inputs of the RPQ500 will always be
free from P48 Phantom Power, even if it is accidentally engaged. Never-
theless, it is recommended to keep the Phantom Power off when the unit
is used in this mode.
Output Connections
The output of the RPQ500 emulates a transformer-coupled output and
can be used as either a balanced or unbalanced signal (depending on how
your cable/system is configured). When balanced, the maximum output
level is +28 dBu; when unbalanced, the maximum level is +22 dBu.
(These are as measured into a 600Ω load; the recommended load is >
10kΩ). 0 dBu = 0.7746 V rms.)
When unbalancing the XLR output, pin-3 must be tied to ground at the
receiving end (i.e. the input of the following device). Do not tie pin-3 to
ground directly at the output of the RPQ500.
Input Gain
Line Input
Input Impedance: 33 kΩ
1
2
3
+7 dB
- 6 dB
+56
+48 V
P48 and CurveShaper
Figure 2: RPQ500 Single Line diagram
Output Gain
Curve Shaper
26
+20
kHz
Peak
9
kHz
dB
Boost
-64
2.1
+0
kHz
High
Gain
Low Cut
Filter
18
360
85
Hz
+0 dB
Red snaps on at +24 dBu
+19
Yellow brightens from 0 to +20 dBu
Green snaps on at -6 dBu
+6 dB
A
E
udio
www.ribbonmics.com
Handcrafted in Pasadena, California
Level LEDs
Balanced XLR Out
(Pin 2 High)
Max Gain: +81 dB
2
1
3
ngineering
Associates
626 - 798 -9128
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