STUDIO TECHNOLOGIES INC. Model 544D

• Dante audio-over-Ethernet テクノロジー
• 入出力レベルメーター
• 入出力ノミナルレベルの切り替え
• 高音質設計
• GPI/GPOサポート
• トーン・ジェネレータモード
• PoEおよび12Vdcによる電源供給
• テーブルトップ,ポータブル,ラックマウント(オプション)

Power Sources

• Power-over-Ethernet (PoE): class 1 (very low power, ≤3.84 watts) per IEEE 802.3af
• External: 10 to 18 volts DC, 0.3 amp maximum at 12 volts DC

Network Audio Technology

• Type: Dante audio-over-Ethernet
• Bit Depth: up to 24
• Sample Rates: 44.1 and 48 kHz
• Number of Receiver (Input) Channels: 2
• Number of Transmitter (Output) Channels: 2
• Dante Audio Flows: 4; 2 receiver, 2 transmitter

Network Interface

• Type: twisted-pair Ethernet, Power-over-Ethernet (PoE) supported
• Data Rate: 100 Mb/s (10 Mb/s not supported; 1000 Mb/s "GigE" Ethernet not supported unless falls back to 100 Mb/s)

Line Inputs: 2

• Type: analog, electronically balanced, capacitor coupled
• Impedance: 20 k ohms, nominal
• Nominal Level: +4 dBu, reference -20 dBFS or 0 dBu, reference -18 dBFS, configurable
• Maximum Level: +24 dBu when configured for +4 dBu nominal, +18 dBu when configured for 0 dBu nominal
• Dynamic Range: >114 dB, A-weighted
• Distortion (THDS+N): <0.002% (-95 dB), measured at -1dBFS, 22 kHz bandwidth
• Frequency Response: +0.0 dB/-0.5 dB, 20 Hz to 20 kHz; 10 kHz low-pass filters disabled
• Low-Pass Filters: -3dB @ 10 kHz, -55 dB @ 20 kHz, configurable on or off in tandem with line output filters

Line Outputs: 2

• Type: analog, electronically balanced, capacitor coupled, intended to drive balanced or unbalanced loads of 2 k ohms or greater.
• Source Impedance: 200 ohms
• Nominal Level: +4 dBu, reference -20 dBFS, or0 dBu, reference -18 dBFS, configurable
• Maximum Level: +24 dBu when configured for +4 dBu nominal, +18 dBu when configured for 0 dBu nominal
• Dynamic Range: >114 dB, A-weighted
• Distortion (THDS+N): 0.003% (-90 dB), measured at -1dBFS, 22 kHz bandwidth
• Frequency Response: ±0.1 dB, 20 Hz to 20 kHz, 10 kHz low-pass filter disabled
• Low-Pass Filters: -3dB @ 10 kHz, -55 dB @ 20 kHz, configurable on or off in tandem with line input filters

Tone Generator

• Type: sine-wave
• Frequency: 18 kHz ±350 mHz; 20 kHz ±350 mHz
• Analog Output Level: +4 dBu, nominal
• Analog Output Distortion (THD+N): <0.003%
• Digital Output Level (Dante transmitter (Output)): -20 dBFS
• Digital Output Distortion (THD+N): <0.0001%

Meters: 4

• Function: displays level of line inputs and line outputs in dBFS
• Type: 5-segment LED, modified VU ballistics

GPI: 2

• Type: logic input, pulled to +3.3 volts DC through 3.3 k (3300 ohm) resistor, pull down to common to enable
• Signaling Method: tones summed into Dante transmitter audio path, 20 kHz nominal at 48 kHz sampling rate, 18.375 kHz nominal at 44.1 kHz sampling rate

GPO: 2

• Output Type: solid-state relay contact
• Contact Type: form A (normally open, not shorted), isolated
• Contact Rating: 400 mA, 60 volts AC/DC, maximum
• Contact Resistance: 2 ohms, maximum
• Detection Method: monitors Dante receiver audio path for presence of 20 kHz (±800 Hz) tone at 48 kHz sampling rate, 18.375 kHz (±800 Hz) tone at 44.1 kHz sampling rate. Tones will pass to line outputs unless low-pass filters enabled.
• GPO Status LEDs: 2

Auxiliary DC Output

• Application: for use with GPO outputs
• Type: 12 volts DC, nominal, 10-18 volts DC with external power connected, 25 mA maximum

Connectors

• Line Inputs: 3-pin female XLR
• Line Outputs: 3-pin male XLR
• Ethernet: Neutrik etherCON RJ45
• External DC: 4-pin male XLR
• GPI/GPO/Aux DC: 9-pin female D-subminiature (DE-9F)
• USB: type A receptacle (located inside Model 44D's enclosure and used only for application firmware updates)

Dimensions -Overall

• 8.7 inches wide (22.1 cm)
• 1.72 inches high (4.4 cm)
• 8.3 inches deep (21.1 cm)

Mounting Options

• single-unit rack-mount front panel (M44DRM-1) and two-unit rack-mount front panel (M44DRM-2); uses one space (1U) in a standard 19-inch rack

Weight

• 1.8 pounds (0.80 kg), rack-mount front panels add 0.2 pounds (0.09 kg)