FP24 2-Channel Stereo Preamplifier and Mixer

NOTE: The FP24 has been discontinued. For further assistance, please contact our Applications Engineering department.

(Discontinued) Studio-quality portable microphone mixer that excels in no-compromise situations.

The FP24 is a studio-quality, two-channel, portable stereo microphone mixer, designed for active use in demanding broadcast environments. Features including assignable L-C-R inputs, built-in slate microphone, 1 kHz tone oscillator, and headphone monitoring render this mixer extremely adaptable in application. The remarkable audio performance and comprehensive attributes of the FP24 make it an appropriate choice for studio or field production engineers. Due to its compact and rugged mechanical and electrical construction, the FP24 excels in no-compromise settings such as radio, television and film production.

• Two transformer-balanced microphone inputs with left, center, and right position mixing capabilities
• Unique seven-segment peak output meters, with three selectable levels of LED brightness - readable even in direct sunlight
• High current balanced output drivers provide signal integrity over long cable runs
• Headphone preamplifier enables monitoring of program audio or external tape return
• Ability to link with the Shure FP33 mixer using the A33LK accessory cable to create a highly portable 5 x 2 audio production system.
• "Unclippable" input peak limiters with adjustable threshold (each input)
• Powered with two standard AA alkaline batteries (11-12 hours) or 4-14Vdc power (PS20)
• Switchable low-cut filters with 80 and 160 Hz corner frequencies, 6dB per octave
• Phantom power, selectable between 48 volts and 15 volts

Gain:

Mic Input to Output, per channel, continuously variable

Output	Gain Range
LINE	-infinity -66 dB
TAPE	-infinity _56 dB

 

Frequency Response:

20 Hz to 30 kHz, +0.2, ­0.5 dB; -1 dB at 5 Hz, 50 kHz

(relative to 1 kHz level with 150 ohm source, gain controls set at 50%)

 

Equivalent Input Noise:

­126 dBu (­128 dBV) minimum

(150 ohm source, flat weighting, 22 Hz tp 22 kHz bandwidth, gain control set at 50% or higher, phantom power off)

 

Input Clipping Level:

­10 dBu minimum

 

Output Clipping Level:

Line: +22 dBu minimum with 100k ohm load, +20 dBu minimum with 600 ohm load

Tape: +11 dBu (2.75 V RMS) minimum with 100k ohm load

 

Dynamic Range:

110 dB minimum

 

THD + Noise:

0.05% maximum

(from 50 Hz to 22 kHz @ +4 dBu output level, 22 Hz to 22 kHz filter bandwidth, gain control at 50%, phantom off)

 

Common Mode Rejection Ratio:

100 dB minimum at 80 Hz

60 dB minimum at 10 kHz

 

Channel Separation:

Greater than 80 dB at 1 kHz (gain controls set to 50%)

 

Inputs:

Transformer-balanced, 2k ohm input impedance

 

Outputs:

XLR: Active, impedance-balanced, 120 ohm output impedance

Tape (3.5 mm (1/8 in.)): Unbalanced, tip­left, ring­right, sleeve­ground, 2.4k ohm output impedance

 

High Pass Filters:

80 Hz or 160 Hz (switch selectable), 6 dB per octave

 

Phantom Power:

15 V through 680 ohm resistors or 48 V through 6.8k resistors (switch selectable)

 

Limiter:

Thresholds independently adjustable from +6 dBu to +18 dBu

10:1 limiting ratio

5 ms attack time, 100 ms release time

Amber/Red LED indicates limiting/clipping

Dual mono or stereo linked

 

Internal Voltage Rails:

+15 V and ­15 V, regulated

 

Metering:

7 segment GaN (Gallium Nitride) meter with 3 intensities Peak responding

 

Power:

Internal: 2 AA batteries

External: 5 ­ 14 VDC via threaded coaxial connector (5.5 mm outer diameter, 2.1 mm inner diameter); Pin positive, sleeve negative; Voltages above 14 VDC cause no damage to unit, but will open an internal poly fuse that will reset when voltage is removed.

 

Power LED:

Dual-color LED indicates following:

Green--external DC power or good battery.

Red--less than 1 hour of battery life remaining (with phantom power off).

 

Polarity:

All inputs to all outputs, non-inverting. Pin 2 of XLRs "hot" (to unbalanced inputs and outputs).

 

Operating Temperature Range:

0 to 70 degrees C (32 to 160 degrees F)

 

Dimensions:

43 mm x 94 mm x 140 mm (H x W x D) (1.7 in x 3.7 in x 5.5 in)

 

Weight (FP24 only):

0.8 kg (1.8 lbs.)

 

Weight (packaged):

1.2 kg (2.6 lbs.)

• FAQ's on FP24