Linea Research XiB4


XiB4 Amplifiers


About this item



Linea Research XiB4 Amplifier

Linea’s XiB4 is a four-channel amplifier suitable for use anywhere a powerful, clean-sounding product with inbuilt DSP is required. Equally, at home in portable PA, conferencing, and contractor environments, the XiB4 is the perfect choice in any application where being tamperproof is important.

XiB4 Features

  • Four channels of sonically pure Class D amplification
  • Unique, precise, 96kHz digital signal processing
  • Over‐designed switch mode power supply
  • 85V to 240V Auto-sensing PSU
  • 5,000 watts RMS total output
  • Tamper-proof front panel
  • USB and BvNet network operation
  • Powerful grouping & multi‐layer EQ
  • Fully designed and engineered in-house by Linea Research
  • Manufactured in the UK
RMS per channel, all 4 channels driven
Model2 Ohms4 Ohms8 Ohms

Linea’s XiB4 is a four-channel amplifier suitable for use anywhere a powerful, clean-sounding product with inbuilt DSP is required. Equally, at home in portable PA, conferencing, and contractor environments the XiB4 is the perfect choice in any application where being tamperproof is important.

Remote operation is possible with Linea’s intuitive Podware PC application over BvNet, our installation-friendly network. BvNet is an RS485-based system that allows many XiB4 amplifiers to be ‘daisy chained’ over hundreds of meters using low-cost cables and without the need for network switches etc. Integration with other parts of a system is possible using dimple contact closure ports and Linea offers a range of interface units that allow seamless connection to Ethernet and Dante.

The XiB4 also provides extensive fault and status logging including driver integrity monitoring. These facilities are usually only associated with expensive specialized products and this is the first time that they have been made available as standard features for no additional cost.

The advanced 96kHz DSP is fully integrated into the product and provides an array of unique and genuinely useful features. Because all aspects of the DSP algorithms are designed and handcrafted in-house by Linea, they are not available on products from any other manufacturer. For example, LIR linear phase crossover filters are as easy to use as more conventional filter shapes and have less latency than FIR filters.

Each of the XiB’s four channels can deliver 1,250 Watts RMS into 2 Ohms continuously, or up to 2,500 Watts into 4 Ohms for a bridged pair of channels. Unusually these are not, ‘transient’, ‘burst’, or ‘peak’ power figures, they are the power levels that are delivered by all channels simultaneously even when driven with the same dense program material.

With Linea amplifiers there is no need to ration power between channels, you can use all the power you have paid for all the time.

Linea can do this because state-of-the-art components and a finely optimized design result in an amplifier that is more efficient than competitive products. This efficiency gain directly translates into the generation of less wasted energy (heat). In addition to reducing energy costs, high-efficiency results in generous power reserves ensuring that pristine sound quality is maintained even under the most extreme conditions.

General Specifications­

Number of output channelsFour
Total power output, all channels driven5,000 Watts RMS
Audio inputs4x Balanced Analogue
Digital Signal ProcessingHigh-performance 96kHz DSP on all inputs and outputs
Control, monitoring, and system statusUSB and BvNet (optimized RS485) 

Contact closure ports for voice recall and system shutdown

Power-save modesStandby after user-defined time with fast wake-up on audio detection or from a network command

Power Output

Power specificationRMS output all channels driven with continuous program material and a nominal ambient temperature of 40ºC / 105ºF
Crest Factor of 4 (12dB), 2-Ohm nominal load1,250W per channel
Crest Factor of 2.8 (9dB), 4-Ohm nominal load800W per channel2,500W per bridged pair
Crest Factor of 2 (6dB), 8-Ohm nominal load450W per channel1,600W per bridged pair
25V line (CV) operation, Crest Factor 4 (12dB)625W per channel
70V line* (CV) operation, Crest Factor 4 (12dB)1,250W per channel  *can drive 70V line to -2dB max.2,500W per bridged pair
100V line* (CV) operation, Crest Factor 4 (12dB)1,250W per channel  *can drive 100V line to -5dB max.2,500W per bridged pair

Audio Performance

Amplifier topologyLinea Research high-performance Class D
Amplifier modulation schemeLow feedback, multiple loops, with feed-forward error correction
Output noise, ref. maximum amplifier outputBetter than 106dBA typical, unmuted
Gain (with all the DSP level controls set to 0dB)27dB
Frequency response, 4 Ohm load20Hz to 20kHz, +/-0.5dB
Total harmonic distortion, THD<0.05% typical, 1kHz signal, AES17 filter, 4 Ohm load
Inter-channel crosstalk, worst-case combinationbetter than -80dBr at 1kHz
Slew rate>25V per microsecond typical
Damping factor (Ref 8 Ohms)>100 at amplifier output (see Linea’s “Damping factor debunked” white paper)
Maximum analog input level+20dBu
Analog input sensitivity range for full output0dBu to +20dBu, continuously adjustable
Analog input (four channels)Input 10k Ohm, electronically balanced, link directly connected to the input
Analog ground schemeAES48 standard compliant

Digital Signal Processing

Resolution40 bit, using Linea Research proprietary algorithms
Sample rate96kHz throughout
Input processing, per channelInput signal routing, Delay, Gain, Phase, Mute 

EQ: 4th order HPF, 4th order LPF, 8x Parametric, Low and High shelving filters

Output processing, per channelSource, Delay, Gain, Phase, Mute, up to 8th order crossover filters, intelligent limiter 

EQ: 6x Parametric, Low, and High shelving filters

Crossover filter typesBessel 



Hardman (Like Linkwitz-Riley but with better out-of-band rejection)

Pre-set management4 voice pre-sets per channel pair, selected by contact closure

Power Supply

Topology (main power supply)Linea Research high-efficiency Series Resonant
Nominal mains input voltage range85V to 240V, the Power supply automatically detects the voltage and configures accordingly
Mains input frequency range47Hz to 63Hz
Mains inrush current (max for <10ms)23A at 115V, 46A at 230V

Protections Systems

Under all circumstances the control and protection systems will endeavor to deliver the maximum power possible for a given set of conditions, applying limiters only in extreme circumstances. Muting will only occur when a dangerous situation is detected, normal operation automatically resumes when the condition clears.
System protectionSpeaker protection
Excessive power supply current (per channel pair)Sonically clean audio limiter
Excessive internal temperature (per channel pair)DC offset protection
Mains voltage within acceptable limitsInternally stored information
Output current within limits (each channel)Log of temperature over time
Driver impedance within limits (each channel)Log of protection gain reduction over time
Power throughput within limits (each channel)Log of output current over time (each channel)
Switch on mains surgePower cycle count
An inbuilt notification system is provided to indicate problems to remote devices via the network


CoolingVari-speed fans, back-to-front airflow
Analogue IN and LINK4x female and 4x male Neutrik™ XLR
Amplifiers output4x Neutrik Speakon™ NL4 connectors
Mains inputNeutrik 20A Powercon™
USBStandard USB ‘B’
Network (BvNet)RJ45 in with RJ45 daisy chain link
Contact closure and shutdown inputsRJ45 in with RJ45 daisy chain link
LED indicatorsBright, easily differentiated
Operating temperature range and humidity0 to +40ºC, (+32 to +105ºF)          0 to 80% RH (non-condensing)
EnclosureStandard 19” 2U (88mm), 360mm (14”) deep (from the rear panel to front rack support)
Optional accessoriesRear rack support kit
Net Weight9.5kg (20 pounds).


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