Whirlwind IMP-1x3 Splitter
Article number 1958300Passive line level splitter, 1 input to 3 outputs, 1 direct output, 2 transformer-isolated outputs, individual Ground Lift switches, isolated outputs 6 dB below direct output, galvanic isolation
Whirlwind SP1X3LL – passive 1-to-3 line level splitter with transformer isolation and Ground Lift
The Whirlwind SP1X3LL is a professional passive line level splitter designed to distribute a single line level audio signal to three separate outputs. Featuring one direct output and two transformer-isolated outputs, it allows the same signal to be routed simultaneously to multiple mixing consoles, recording systems or other audio equipment. The isolated outputs help prevent ground loops and unwanted hum when connecting equipment with different ground potentials.
Designed for professional audio installations, live sound, broadcasting and studio applications, the SP1X3LL offers reliable signal distribution with straightforward operation. Each transformer-isolated output features its own Ground Lift switch for independent control of the signal ground connection. With a maximum input level of +20 dBu at 20 Hz and a fully passive design, the SP1X3LL provides a practical solution for distributing line level signals without requiring an external power supply.
Features and benefits
Distributes one line level signal to three outputs
The Whirlwind SP1X3LL features one line level input and three separate outputs. One output is directly connected, while the other two are transformer-isolated. This configuration allows a single audio source to feed multiple systems simultaneously, such as a front-of-house mixing console, a monitor mixer and a recording interface. It provides a convenient solution whenever several audio systems need access to the same signal.
Two transformer-isolated outputs
The two isolated outputs use audio transformers to provide galvanic isolation between connected audio systems. This helps reduce the risk of ground loops and unwanted interference when equipment is connected across different audio installations. Transformer isolation is particularly useful when distributing signals between independent mixing consoles, recording systems or equipment powered from separate electrical circuits.
Individual Ground Lift switches for each isolated output
Each transformer-isolated output has its own dedicated Ground Lift switch. This allows the signal ground connection to be disconnected independently on either isolated output, helping to minimise hum and ground-related noise. The independent switches provide additional flexibility when configuring complex audio systems without affecting the other output connections.
Direct output maintains the original signal level
The direct output passes the line level signal through without the attenuation applied to the transformer-isolated outputs. This makes Direct Out suitable for feeding equipment that should receive the same nominal signal level as the input. For example, the direct output can feed the main mixing console while the isolated outputs distribute the signal to additional systems.
6 dB lower signal level on isolated outputs
Both transformer-isolated outputs deliver a signal level that is 6 dB lower than the direct output. This attenuation is an intentional characteristic of the splitter's design and should be considered when setting levels on connected equipment. The difference can be compensated for using the input gain controls of the receiving devices, ensuring consistent levels throughout the audio system.
Fully passive operation without external power
The SP1X3LL operates entirely passively and requires no external power adapter, batteries or mains connection. Signal distribution is handled by its internal wiring and audio transformers. This straightforward design makes the splitter dependable and easy to use in both portable sound systems and permanent installations.
Handles professional line levels up to +20 dBu
Designed specifically for professional line level signals, the SP1X3LL handles a maximum input level of +20 dBu at 20 Hz. This makes it suitable for use with mixing consoles, audio processors and other professional line level equipment. Unlike conventional microphone splitters, the SP1X3LL is specifically intended for distributing signals at line level.
Technical specifications
- Product type: Passive line level splitter
- Model: Whirlwind SP1X3LL
- Signal distribution: 1 input to 3 outputs
- Signal type: Line level
- Number of inputs: 1
- Number of outputs: 3
- Direct outputs: 1
- Transformer-isolated outputs: 2
- Direct output signal level: Nominally the same as input level
- Isolated output signal level: 6 dB below direct output level
- Galvanic isolation: Yes, on two outputs
- Ground Lift: 2 independent switches
- Maximum input level: +20 dBu at 20 Hz
- Signal processing: Passive, transformer-based
- External power supply: Not required
- Applications: Live sound, broadcast, studio, signal distribution and permanent installations
Frequently asked questions about Whirlwind SP1X3LL
What is the Whirlwind SP1X3LL used for?
The Whirlwind SP1X3LL is designed to split one line level audio signal into three separate outputs. It features one direct output and two transformer-isolated outputs, making it suitable for sending the same signal to multiple mixing consoles, recording devices or other audio systems.
What is the difference between the direct and isolated outputs?
The direct output passes the signal without the splitters intended level reduction. The two transformer-isolated outputs provide galvanic isolation between connected systems and deliver a signal level 6 dB lower than the direct output. Each isolated output also features an individual Ground Lift switch.
Can the Whirlwind SP1X3LL help eliminate hum and ground loops?
Yes, the two transformer-isolated outputs help reduce the risk of ground loops between connected audio systems. Each isolated output also features its own Ground Lift switch, which can be used to minimise hum caused by signal ground connections.
Does the Whirlwind SP1X3LL require a power supply?
No, the Whirlwind SP1X3LL is a completely passive splitter that requires no power adapter or batteries. The signal is distributed through its internal circuitry and transformers without active electronics.
What is the maximum input level of the Whirlwind SP1X3LL?
The Whirlwind SP1X3LL is designed for line level signals and has a specified maximum input level of +20 dBu at 20 Hz. This makes it suitable for professional line level audio sources such as mixing consoles and audio processors.