Shure FP16 Schematic

THE SOUND OF THE PROFESSIONALS

222 HARTREY AVE., EVANSTON, IL 60202-3696 U.S.A.
AREA CODE [phone] • CABLE: SHUREMlCRO

TELEX: 4330191 • FAX [phone]

®

PROFESSIONAL PRODUCTS

GENERAL

The FP16 is a 1-input, 6-output, compact, self­contained audio distribution amplifier for routing multi­ple audio signal feeds without incurring loss, distortion,
hum or noise. The, intelligent design; reliable com­ponents and-meticulous construction of the FP16 make
it the optimum choice for broadcast stations-AM, FM,
or TV, studios or ENG vans-as well as recording
studios, duplicating houses, and telecommunications
and production facilities.

FEATURES

l

Wide-range audio frequency response

l

Up to 90 dB gain

l

Low noise, hum and distortion

l Protected against damage from input overload and

shorted outputs; protected against RFI and
mechanically protected against incorrect battery in­sertion

l

Transformer-coupled XLR input connector is switch­able to low-impedance microphone or line level

l Phantom (simplex) power for condenser micro-

phones available at input

l Six isolated, transformer-coupled XLR outputs are

switchable to low-impedance balanced microphone
or 600-ohm balanced line level

l Link input and output jacks permit “ganging” of

FP16s for additional outputs, or adding external
equipment such as equalizers, compressors or
limiters

l Recessed input gain control with normal and

overload LED indicators

l

Recessed individual output channel gain controls

l

Powered by ac (120 or 240V – internally selectable) or
built-in battery pack

l

Low battery drain provides more than 15 hours opera­tion under normal operating conditions

l

Noiseless and automatic switchover to and from bat­tery power

l

Rugged and durable construction

l

Compact and lightweight for field use and transpor­tation

l Reliable operation over wide temperature and

humidity extremes

l

Rack-mountable with accessory rack mount kit

SPECIFICATIONS

Frequency Response

30 to 20,000 Hz, ±2 dB

Voltage Gain

INPUT

Mic
Line
Link 20 dB -30 dB

(at 1 kHz)

Inputs

INPUT

FOR USE WITH

Mic
Line
Link

*Dependent on input control setting.

150 ohms
Less than 10k 66k
Less than 5k

Outputs

OUTPUT

FOR USE WITH

Mic
Line
Link

150 ohms
600 ohms
600 ohms or
greater

Noise

Equivalent Input Noise: -129 dBV (low-impedance

microphone, 150 ohms, 300 to 20,000 Hz) into 600-ohm
load at full gain

Equivalent Input Hum and Noise: -127 dBV (low­impedance microphone, 150 ohms, 20 to 20,000 Hz) in-

to 600-ohm load at full gain
Output Noise: -90 dBV maximum (output control full

counterclockwise [off]), -65 dBV maximum (output
control full clockwise [on]) (input control down, 300 to
20,000 Hz)

Output Hum and Noise: -75 dBV maximum (output
control down), -65 dBV max. (output control up, in-

put control down, 20 to 20,000 Hz)

(ref 1 kHz)

OUTPUT

LINE

90 dB
40 dB

IMPEDANCE (at 1 kHz)

IMPEDANCE (at 1 kHz)

MICROPHONE LINK

ACTUAL

24k

ACTUAL LEVEL AT 1 kHz

0.5 ohms
180 ohms
100 ohms
or less

40 dB 70 dB

-10 dB 20 dB

INPUT CLIPPING

LEVEL AT 1 kHz

1k

-62 to -6 dBV*

-12 to +44 dBV*

+8 dBV

OUTPUT CLIPPING

- 34 dBV
+ 16 dBV
+ 16 dBV

Copyright 1987, Shure Brothers Inc.
27A8082 (GG)

Printed in U.S.A.

Distortion

0.4% THD, 30 to 20,000 Hz at + 15 dBm output; 0.5%
or less IM distortion at + 15 dBm output

Common Mode Rejection

65 dB minimum with input of -20 dBV at 100 Hz

Control Interaction

Less than 1 dB with any control combination

Overload and Shorting Protection

Shorting outputs, even for prolonged periods, will
cause no damage; microphone input will not be
damaged by signals up to 3V

Phase

All outputs in phase with input. Pin 2 is “high” with
respect to pin 3; pin 1 is ground. Tips of link input and
output phone jacks are in phase with pin 2 of XLR con­nectors.

Phantom Power

30 Vdc nominal, 3.3k series resistance, automatically
disabled with input switch in Line position

Operating Voltage

AC Operation: 120 or 240 Vac ± 10% (internally selec­table), 50/60 Hz, 5.5W

DC Operation: 27 Vdc nominal at 16 mA typical no­signal, 22 mA typical at 0 VU (+4 dBm) output; 21.5
Vdc minimum; battery life approximately 20 hours
with alkaline batteries at +4 dBm output in con­tinuous use; three 9-volt batteries, type NEDA 1604A
(Duracell MN1604 or Eveready 522 recommended)

Temperature Range

Operating:
Storage:

-18° to 57°C (0° to 135°F)

-29° to 71°C (-20° to 160°F)

Dimensions

79.5 mm H x 310 mm W x 230 mm D (3-1/8 in. x 12-7/32
in. x 9-1/16 in.)

Weight

Net: 2.75 kg (6 lb 1 oz)
Packaged: 3.15 kg (6 lb 15 oz)

Certifications

Listed by Underwriters Laboratories, Inc.; listed by
Canadian Standards Association as Certified

CONTROLS AND CONNECTORS
On-Off Switch: applies power to the FP16 circuitry.

Power LED: Indicates unit is on.
Input Gain Screwdriver Control: adjusts input signal

level.

Output 1-6 Screwdriver Control: adjusts individual out­put channel signal levels.

Norm

LED: indicates when signal level is approximately

20 dB below clipping.
Overload LED: indicates when input signal level ap-

proaches clipping.
Three-Pin XLR

1-6 Output

Connectors: provide for con­nection to either low-impedance microphone or line­level inputs of power amplifiers, mixers, or other signal­processing equipment.

Mic/Line 1-6

Slide Switches: select microphone- or line-

level output signal levels.

Phantom On-Off

Slide Switch: applies 27 Vdc (nominal)
phantom (simplex) power to pins 2 and 3 of the input
connector for use with condenser microphones. IMPOR-

TANT: Make certain any condenser microphone used is
compatible with the FP16 simplex circuit, and that the

FP16 input Mic/Line switch is in the Mic position. Do

not

turn the Phantom switch on when using

unbalanced

low-impedance microphones; objectionable hum will

result. Turn the Phantom switch off when phantom­simplex power is not required.

Three-Socket XLR Input connector: provides for con­nection to microphone- or line-level input signal
sources.

Input Mic/Line Slide Switch: selects microphone- or

line-level input signals.

Link In, Out

Phone Jacks: provide for connecting more
distribution amplifiers for additional outputs, or adding
external equipment such as equalizers, compressors, or
limiters. When connecting two or more FP16s together
for additional outputs, connect the Link Out jack of the
“master” unit to the Link In jacks of the others. Any
number of FP16s can be tied together in this way. The
Link In jack is input-only, and has switching contacts to
disconnect the input signal amplifier from the output
channel volume controls.

Connect an equalizer, limiter or compressor to the
FP16 by connecting the FP16 Link Out jack to the exter­nal unit’s input, and the external unit’s output to the
FP16 Link In jack.

Signals at the Link jacks are typically 10 dB below
line level. The Link In input impedance is greater than 20
kilohms and may be considered a bridging impedance.

INSTALLATION AND OPERATION
Battery Operation

In addition to 120- or 240-volt ac operation, the FP16
can be operated from an internal battery pack. Current
drain is typically 22 mA at +4 dBm output level. Battery
operation is recommended for remote, on-location
operation, and as an emergency backup source in case
of ac power failure.

Access to the battery compartment is through the
bottom of the chassis. Three 9-volt transistor radio bat­teries power the FP16 at full rated output. Use alkaline
batteries for maximum life. Duracell MN1604 or
Eveready 522 are recommended. Battery life is approx­imately 20 hours at +4 dBm continuous use. Note that
simplex power loading will increase battery drain.

With batteries in the battery compartment, the FP16
will automatically and silently switch to battery opera­tion should the ac voltage fall below a suitable level.

Connections

Connect the signal source to the three-socket XLR In­put connector and set the input Mic/Line switch for the
proper level. Connect the three-pin XLR 1-6 Output con­nectors to low-impedance microphone or line-level in­puts of power amplifiers, mixers, etc. Set each Mic/Line
switch for the appropriate signal level.

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