Shure FP33 User Manual

Page 7

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Figure 4

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INTERNAL SWITCHES AND CONTROLS (NO TAG)

Battery Compartment: Holds two 9 V alkaline batter-
ies. Two fresh batteries will power the unit for about
eight hours under normal conditions.

Microphone Power Selection Switch: Position this
slide switch to match the type of input power desired:

Top Position 12V T (A-B): Refer to Figure 5. Used
with certain Sennheiser and Schoeps microphones.

–

Balanced Audio
to Microphone
Preamp

Figure 5

FP33
Input

180

Ω

180

Ω

12 V

Power

(A-B)

= Microphone Supply Current

Middle Position (Dynamic): No dc power on pins 1,
2, or 3. Used with dynamic microphones or condenser
microphones that have internal batteries.

Bottom Position (Phantom): Refer to Figure 6. In-
ternal DIP switch 11 selects 12 volts or 48 volts. 48 V
phantom power drains the batteries faster than 12 V
phantom power. Used with all condenser micro-
phones that do not require T power.

–

12–48 V

Phantom

Power

Balanced Audio
to Microphone
Preamp

Figure 6

Phantom

FP33 Input

= Microphone Supply Current

Phantom

–

R = 680

Ω

for 12 V

R = 6.8 k

Ω

for 48 V

Caution: Balanced dynamic microphones will not be
damaged by phantom power but may be damaged by
T power.

Fuse and Spare Fuse: Designed to protect the FP33
from damage that may result from using a common ex-
ternal dc power supply with other electronic devices.
Caution: Damage may result when using a common
external dc power supply with other electronic devices
that are “positive ground.” Separate power supplies are
recommended.

Level R Potentiometer: Attenuates the level of the

FP33 right channel program audio that is fed to the
headphone/monitor circuit. This does not affect the
Monitor In levels at the headphone output.

Peak LED R Potentiometer: Adjusts the Right Peak
LED to light at a preset output level. The factory setting
is +17 dBm. The user adjustment range is 0 dBm to
+17 dBm. See the Peak LED Adjustment paragraph.

Peak LED L Potentiometer: Adjusts the Left Peak
LED to light at a preset output level. The factory setting
is +17 dBm. The user adjustment range is 0 dBm to
+17 dBm. See the Peak LED Adjustment paragraph.

Lim Adj R Potentiometer: Adjusts the Right limiter to
operate at a preset output level. The factory setting is
+15 dBm. The user adjustment range is 0 to +15 dBm.
See the Limiter Threshold Adjustment paragraph.

Lim Adj L Potentiometer: Adjusts the Left limiter to op-
erate at a preset output level. The factory setting is
+15 dBm. The user adjustment range is 0 to +15 dBm.
See the Limiter Threshold Adjustment paragraph.

Level L Potentiometer: Attenuates the level of the

FP33 left channel program audio that is fed to the head-
phone/monitor circuit. This does not affect the Monitor
In levels at the headphone output.

10. Meter Adj R Potentiometer: Adjusts the Right meter to

indicate 0 VU at a preset output level. The factory setting
is +4 dBm. The user adjustment range is 0 to +16 dBm.
Refer to the VU Meter Adjustment paragraph.

11. Meter Adj L Potentiometer: Adjusts the Left meter to

indicate 0 VU at a preset output level. The factory set-
ting is +4 dBm. The user adjustment range is 0 dBm to
+16 dBm. See the VU Meter Adjustment paragraph.

12. Internal DIP Switches: 12 internal DIP switches al-

low the user to customize operation. The function of
each DIP switch is listed in the table on the following
page.

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