Q-4-XLR-TX-RX
XLR Audio over Fiber
QuestTel XLR Audio over Fiber is an industry-grade balanced audio over fiber system that transmits interference-free analog XLR audio over fiber optic cable across distances up to 20km (up to 120km on request). This fiber optic audio extender is built for broadcast, live sound, houses of worship, and professional AV, eliminating the ground loops, EMI, RFI, and signal degradation of long copper runs. It supports singlemode (SM) and multimode (MM) fiber, with a default maximum of 20 km over SM and 3 km over MM, engineerable up to 120 km. Each kit pairs a matched transmitter (TX) and receiver (RX) for lossless 16-bit balanced audio over fiber on a single strand, and is available as 2, 4, 8, 16, and 32-channel XLR audio over fiber transmitter/receiver kits in standalone and rack-mounted configurations. Typical uses include microphone over fiber, intercom over fiber, theaters, stadiums, and places of worship.
XLR audio over fiber: balanced XLR audio transmitted over single-mode or multimode fiber, up to 20km (120km on request), in 2, 4, 8, 16 and 32-channel TX/RX kits for broadcast, live sound and professional AV.
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- Supports 1 to 32 channels of balanced audio forward / bidirectional transmission
- Broadcast-standard analog balanced audio
- Using FPGA, digital coding/decoding and clock recovery technology, high integration and high stability
- Audio interface is XLR Cannon head balanced interface, high dynamic range of 100 dB
- Automatic high-pass filtering, isolation of DC offset
- Intelligent noise control system; soft rising or falling slant waves and analog noise with 100 dB SNR in blast-free operation
- Audio interface is in level 3 lightning protection, up to IEC61000-4-5 (8/20µs) differential mode: 6 KV
- Single and multi-mode compatible, multimode transmission distance is 1 KM, singlemode transmission distance 20 KM, supporting customized transmission distance of up to 100 KM
- LED status indicator to monitor the running status of the device
- Plug and play, no setup required
- Devices are used in pairs. Note that devices are distinguished between transmitter and receiver
| Fiber Index | |
| Wavelength | 1310nm & 1470nm~1610nm (selection is based on device function) |
| Tx power | > -7 dB |
| Rx sensitivity | > -24 dB |
| Fiber connector | FC (SC, ST, LC optional) |
| Audio Index | |
| Signal level | 0.5-4 Vp-p |
| Dynamic bandwidth | 101 dB |
| Total harmonic distortion (THD) | -90 dB |
| Sampling frequency | 192 KHz |
| Audio A/D sampling | 24 Bit |
| Signal to noise ratio (SNR) | 100 dB |
| Amplitude frequency characteristic | ≤ ±0.5 dB |
| Audio input/output impedance | 600 Ω balance |
| Audio maximum input/output voltage | 0~4V / 0~2.5V |
| Audio gain | ±0.1 dB |
| Maximum input level | ≥ 9.5 dBm |
| Non-linear distortion | ≤ 0.2% |
| Audio physical interface | Cannon head female (transmit); Cannon head male (receive) |
| Environment Index | |
| Operating temperature | -20°C ~ 70°C |
| Storage temperature | -40°C ~ 85°C |
| Relative humidity | 5 to 95% (non-condensing) |
| Working life | > 100,000 hours |
| Power supply mode | Desktop: DC 12V 1A • Rack-mounted: AC 110~240V 50/60Hz |
Indicator Status
| LED | Status |
| POWER | Off: the device is powered off • On: the device is powered up |
| FIBER | Off: fiber signal is blocked or due to excessive attenuation • On: fiber signal is properly received |
Model description: 4-Channel XLR Audio over Fiber TX/RX Kit, up to 20km over Single-Mode / Multimode Fiber (up to 120km on request).
Applications
The Q-4-XLR-TX/RX converts XLR audio to fiber, allowing broadcast professionals and enthusiasts alike to eliminate the ground loops and signal degradation common in long copper cable runs. It also allows extending XLR audio over fiber up to 20km and beyond.
Applications include:
- House of worship sound reinforcement systems
- Production-grade microphone and line-level audio transmitted losslessly, free of noise or interference, even over distances exceeding 120km
- Live event audio, transmitting every note and word precisely, without latency
Why Choose the QuestTel 4-Channel XLR Audio over Fiber Kit
Each unit in the XLR Audio over Fiber product line features broadcast-standard 16-bit digital audio encoding and a 100dB signal-to-noise ratio. It is plug-and-play, with LED indicators that make troubleshooting and installation a headache-free process. With support for up to 20km over single-mode fiber (and up to 120km on request), this kit is ideal for large facilities, campuses, and multi-building venues where copper runs simply aren't practical.
