Datasheet

output ports from the intercom system to the Model 41’s audio
inputs. Optimal performance will be gained by configuring
the nominal audio level of the intercom system’s “virtual” IFB
output ports to match the Model 41’s nominal +4 dBu input
level. With the Model 41’s excellent audio and power delivery
performance it’s an ideal alternative to the interface devices
offered by the intercom system vendors. Using the Model 41
the intercom system’s audio quality can be maintained all the
way to the IFB users.
The Model 41’s IFB outputs allow virtually every type of IFB
user device to be supported. These include the Models 32A,
33A, and 34 listen-only beltpacks and Model 200-Series
announcer console products from Studio Technologies. The
30-series units offer a range of features while providing excel
-
lent audio performance. The 200-series units combine a variety
of microphone control, headphone monitoring, IFB and intercom
system interfacing, and related functions into compact desktop
units. Legacy listen-only beltpacks from RTS, including the
4020 and 4030, can also be directly supported.
Alternate Applications
In addition to broadcast intercom applications, the Model 41
can be used to create high-performance stereo headphone cue
systems. Line-level signals coming from an audio console, a
routing switcher, or an off-air receiver can be connected to the
Model 41’s audio inputs. The IFB outputs can be connected
to listen-only beltpacks, several models of which are available
from Studio Technologies. For example, the Model 35 Talent
Amplifier will allow one or two pairs of stereo headphones to
be supported. Each of the Model 41’s four IFB output circuits
will support up to six Model 35 Talent Amplifiers.
Studio Technologies, Inc. Model 41 Interface, Issue 3, Page 3
Model 41 Specifications
General Audio:
Frequency Response – Pin 2 Output (DC with Channel 1 Audio):
+0/–3 dB, 20 Hz-20 kHz; +0/–1 dB, 100 Hz-20 kHz
Frequency Response – Pin 3 Output (Channel 2 Audio):
+0/–3 dB, 20 Hz-20 kHz; +0/–1 dB, 100 Hz-20 kHz
Distortion (THD+N) – Pin 2 Output (DC with Channel 1 Audio):
0.05%, measured at 1 kHz, +4 dBu
S/N Ratio – Pin 2 Output (DC with Channel 1 Audio):
86 dB, ref +4 dBu out, A-weighted
Audio Inputs: 8, organized as four 2-channel inputs
Type: transformer balanced, compatible with balanced or
unbalanced sources
Impedance: 10 k ohms, nominal
Nominal Level: +4 dBu
IFB Outputs: 4
Type: DC power with two channels of unbalanced audio (“wet” IFB)
Connections:
Pin 1: common
Pin 2: 30 volts DC (nominal) modulated with channel 1 audio
(–10 dBu nominal)
Pin 3: channel 2 audio (–10 dBu nominal)
Maximum Audio Output Level:
Pin 2: +9 dBu with +23 dBu on audio input
Pin 3: +14 dBu with +28 dBu on audio input
DC Current Output: 220 mA maximum
Monitor Section – Headphone Output:
Type: 2-channel (stereo), drives headphones by way of 100 ohm
series resistors
Compatibility: intended for connection to headphones with
impedance of 100 ohms or greater
Maximum Voltage: 8 Vpp, 100 ohm load
Monitor Section – Output Voltage Detection:
Measures DC voltage level directly on pin 2 of IFB output
connectors. Status LEDs flash when level is less than
approximately 24 volts DC.
Connectors:
Audio Inputs: 25-pin female D-subminiature, 4-40 threads on
locking hardware (two places)
IFB Outputs: 3-pin male XLR
Headphone Output: ¼-inch 3-conductor phone jack
AC Mains: 3-blade, IEC 320 C14 (mates with IEC 320 C13
connector)
AC Mains Requirement:
100-240 volts (±10%), 50/60 Hz,
40 watts maximum
Dimensions (Overall):
19.0 inches wide (48.3 cm)
1.72 inches high (4.4 cm)
6.4 inches deep (16.3 cm)
Mounting: one space (1U) in a standard 19-inch rack enclosure
Weight:
3.7 pounds (1.7 kg)
Specifications subject to change without notice.
© by Studio Technologies, Inc., December 2013
Studio Technologies, Inc.
Skokie, Illinois USA [phone] www.studio-tech.com