Shure FP22 specifications Features, Shure Brothers Incorporated 222 Hartrey Avenue

GENERAL

The FP22 is a battery-powered stereo headphone amplifier that provides headphone feeds from any audio input source. It has the unique capability of monitoring mono, stereo and mixed mono and stereo inputs. The FP22 monitors and combines these signals in the headphones without affecting the original signal. Stereo or mono headphone outputs appear on 1/4-inch phone or mini 3.5 mm stereo jacks. The FP22 can drive headphones to very loud levels. It is ideal for anyone in the broadcasting, sound reinforcement or audio recording fields who needs a flexible, high±quality head- phone monitor.

The FP22 is excellent for:

•Line checking applications

•Providing multiple headphone feeds

•On stage in-ear monitoring

•Boosting headphone circuits

•Headphone foldback in recording studios

•Practicing musical instruments or mixed vocals through headphones while monitoring a stereo source

Features:

•Exceptionally wide frequency response and dynamic range

•High-impedance bridging inputs do not load signal sources

•Capable of mixing mono and stereo inputs in headphone outputs

•Complete user control of headphone volume

•Loopthrough 1/4-inch stereo phone jacks (can be internally switched to become separate left and right inputs)

•30 dB pad for stereo line input to accommodate a wide range of line level sources

•Balanced loopthrough XLR connectors switchable from mic to line level

•Separate XLR volume control on pull-out control knob

Shure Brothers Incorporated

222 Hartrey Avenue

Evanston IL 60202-3696 U.S.A.

Model FP22 User Guide

•Overall headphone balance control

•Overall stereo/mono switch for headphones

•LED power indicator

•Powered by easily obtainable 9±volt alkaline battery or by external 12 to 24 Vdc power supply (such as Shure Model PS20 or PS20E)

•1/4-inch and 3.5 mm stereo headphone jacks

•Effectively shielded for low susceptibility to radio-frequency interfer- ence (RFI)

SPECIFICATIONS

Frequency Response (ref 1 kHz)

20 Hz to 20 kHz, +1, ±3 dB (stereo line input) 50 Hz to 18 kHz, +1,±3 dB (mono XLR input)

Equivalent Input Noise

±125 dBV (maximum gain; source resistance 150 Ω; 20 Hz to 20 kHz)

Voltage Gain (at 1 kHz)

	Source	Gain	Gain
Input	Impedance	(into 63 Ω)	(into 8 Ω)
XLR	150 Ω	80 ± 5 dB	74 ± 5 dB
(mic level)
XLR	600 Ω	29 ± 5 dB	23 ± 5 dB
(line level)
Stereo line	600 Ω	26 ± 4 dB	21 ± 4 dB
(pad at 0 dB)
Stereo line	600 Ω	±4 ± 4 dB	±10 ± 4 dB
(pad at ±30 dB)

Total Harmonic Distortion

Less than 0.5% measured at ±8 dBV into 8 Ω (20 Hz to 20 kHz stereo line input; 50 to 18 kHz mono XLR input)

Input Clipping Levels (at 1 kHz)

Mic level . . . . . . . . . . . . . . . . . . . . . . . . . . . . 160 mV (±16 dBV)

Line level . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 50 V (+34 dBV)

Output Level at Clipping

Headphones	FP22 Out-	Headphones	Head-
Impedance	put	Sensitivity	phones SPL
63 Ω	1.2 V (1.6	106 dB at 1	120 dB
	dBV)	mW
8 Ω	500 mV (±6	95 dB at 1	110 dB
	dBV)	mW

Input Impedance

XLR (mic level) . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6.3 kΩ ±10% XLR (line level) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 66 kΩ ±10% Stereo Line (pad at 0) . . . . . . . . . . . . . . . . . . . . . . . 50 kΩ ±10% Stereo Line (pad at 30 dB) . . . . . . . . . . . . . . . . . . . 53 kΩ ±10%

Headphone Output Impedance (at 1 kHz)

10.2 Ω ± 10%

1997, Shure Brothers Inc.	Printed in U.S.A.
27A8362 (QE)