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The APB 124 SB : 1 MIC/LINE IN : 24 OUT is a professional, portable active audio splitter (also known as a press box) designed for distributing a single audio source to multiple reporters or media outlets at press conferences and other events.
Key Features
- Input and Outputs: It has one balanced XLR input that can handle both microphone and line-level signals. This single input is then distributed to 24 independent, transformer-balanced, and isolated XLR outputs.
- Output Flexibility: Each of the 24 outputs is individually switchable between microphone and line-level, providing the flexibility to connect to a wide range of recording devices and other audio equipment.
- Built-in Processing: The unit includes several features to ensure a clean and consistent audio signal:
- High-Pass Filter: A switchable 160Hz high-pass filter helps to reduce low-end rumble, such as handling noise or wind noise.
- Compressor/Limiter: An integrated, switchable compressor and limiter on the input channel prevents clipping and distortion, ensuring a constant output level regardless of the input source.
- Test Signal Oscillator: A built-in 1kHz test tone oscillator allows for quick and easy level setting for all connected devices.
- Headphone Output: A dedicated headphone jack with its own volume control lets you monitor the input signal.
- Power and Portability: The APB-124 SB is designed for both indoor and outdoor use.
- Battery Power: It has a built-in Li-Ion "AccuPack" battery that provides up to 10 hours of operation at full load, making it independent of an external power source. The battery management system has a front-panel status meter.
- External Power: It can also be powered by a 24V DC external power adaptor.
- Scalability: The unit features a "Link" output, which allows you to daisy-chain multiple APB-124 SB units together if you need more than 24 outputs.
- Construction: The APB-124 SB is built into a rugged metal "stagebox" housing, making it durable for professional use in various environments.
Audio Specifications
- Type: Active, Portable Press Box (Audio Splitter)
- Input:
- Number of Inputs: 1
- Connectors: Balanced, XLR
- Max. Input Level (Limiter ON):
- Mic: −10dBu
- Line: +36dBu
- Max. Input Level (Limiter OFF):
- Mic: −2dBu
- Line: +24dBu
- Phantom Power: Switchable 48V
- Input Impedance:
- Mic: 2.4 kΩ
- Line: 3.5 kΩ
- Pad: 26dB PAD for line-level signals
- Outputs:
- Number of Outputs: 24
- Connectors: Balanced, XLR
- Switching: Each output is independently switchable between Mic and Line level
- Nominal Output Level: +6dBu
- Maximum Output Level:
- +20dBu (no load)
- +14dBu (600Ω load)
- Output Impedance:
- Mic: 220Ω
- Line: 600Ω
- Isolation: Each output is transformer-isolated
- Performance:
- Signal-to-Noise Ratio (SNR): 86dB
- Frequency Response: 30Hz to 30kHz (−1dB) with a switchable high-pass filter at 160Hz.
- Link Output: 1 dedicated Link output for daisy-chaining multiple units to expand the number of outputs.
Processing and Controls
- Input Gain: Gain control knob to adjust the input signal level.
- High-Pass Filter (HPF): Switchable 160Hz filter to reduce low-frequency noise.
- Compressor/Limiter: Switchable compressor and limiter on the input channel to prevent clipping and ensure a consistent output level.
- Oscillator: Built-in 1kHz test signal oscillator for setting output levels.
- Headphone Output: Dedicated headphone jack with its own volume control for monitoring the input signal.
Power & Physical Specifications
- Power Supply:
- 24V DC, 1A external power adapter.
- Built-in Li-Ion "AccuPack" battery (14.4V 2200mAh).
- Battery Operation Time: Minimum 10−12 hours at full load.
- Chassis: Rugged, metal "stagebox" housing.
- Dimensions (WxHxD): 365×195×135mm (14.4×7.7×5.3 inches)
- Weight: 4.53 kg (10 lbs)
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