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Articles May-June 2021

Pursuing the Pro Audio Trail

In conversation with Caroline Moss and Sue Gould

PT got in touch with the Pro AVL Asia magazine core team of Editor - Caroline Moss and Sales Director - Sue Gould, who between them boast of over three decades of experience in the pro audio industry..... read more

NJSM Marks a Milestone in the Business of Sound

From Rental Company to manufacturer and innovator, Nixon Johnny has guided and grown NJSM from a two-person company to a fifty-person company, continuing to expand into virtual events with NJSM Virtual Studio..... read more

Tech Savvy Environment for T-Systems

Eyte Technologies installs high-tech AV Solution at T-System’s Experience Center facilitating brand value and delivering superior customer experience..... read more

Conversations with SudeepAudio

Sudeep Audio, one of India’s first pro audio web store selling studio software and equipment online commenced its YouTube Channel, ConverSAtions, in 2011 to share the journey of Indian Sound Engineers..... read more

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Power Amplifiers


L-Acoustics LA8

Proprietary algorithms are processed in a 32-bit floating point DSP engine at a 96 kHz sampling rate. A dedicated engineering approach combining IIR and FIR filters allows generating perfectly linearized phase curves and significantly improved impulse responses for an even more natural, transparent, and realistic sound experience. Two cascaded 24-bit A/D converters at the front-end yield a ground-breaking encoding dynamic of 130 dB.

The L-DRIVE protection system carries out a dual analysis of signal level in real-time and RMS. Under extreme conditions when component membranes reach the over-excursion zone or if the coil ensemble temperature reaches a critical point, L-DRIVE acts as a power regulator. As a result the amount of power delivered at any channel is adjusted to the dynamic and thermal capacity of each individual transducer. This optimizes the power resources while preserving the highest dynamic range.

With a complete preset library and the possibility of creating additional user presets, the engineer is offered fingertip access to all the usual L-ACOUSTICS loudspeaker system configurations.

The four amplifier channels driven by two inputs provide optimum system flexibility. The LA4 and LA8 offer two specific power ranges (4 x 1000 watts into 4 ohms, and 4 x 1800 watts into 4 or 2.7 ohms, respectively) yielding perfect power matching to each individual L-ACOUSTICS loudspeaker system.

The built-in technologies allow control of the very wide dynamic range found in live audio productions while the high-efficiency components offer superior reliability, all from a sleek ergonomic package with exceptional weight/size ratio.

The front panel user interface features extremely fast access to edit the 2 input and 4 output settings. The encoder wheel gives instant access to the user menus and the LCD screen offers real time visualization of the system parameters.

Command access includes mute, gain, preset selection, plus delay and polarity settings. Navigation through the menu pages is fast and intuitive. Beside the standard on-board preset library, the engineer can design and store his own settings (initialized from a standard preset template) in one of the 10 available user locations.

Main Features include:

• Cutting edge loudspeaker amplification, DSP, network
• High-grade 24 bit A/D converters, 130 dB dynamic range
• 96 kHz/32 bit floating point SHARC DSP
• 4 channel high efficiency amplifier section fed by 2 inputs
• 4 x 1800 W / 4 Ohms
• Advanced dual IIR/FIR filter algorithms
• Exclusive L-DRIVE system protection
• Complete onboard L-ACOUSTICS preset library
• LA NETWORK MANAGER 2 software for remote control & monitoring
• AES/EBU Standard on LA8 and LA-RAK

Crest Audio CC 4000

The CC Series amplifiers are built with tunnel-cooled heat sinks, variable-speed DC fans and extensive protection circuitry for superior efficiency into difficult loads and power conditions. The robust amps also boast of more power devices (16 per channel), in addition to a switched-rail class H output stage and triple-compound design to provide low distortion and good thermal stability.

With a linear power supply the three versatile CC Series amps deliver stable and high power output for running main systems, monitors and subwoofers.

Main Features include:

• 8 Ohm Stereo - 800 W
• 4 Ohm Stereo - 1350 W
• 2 Ohm Stereo - 2000 W
• 4 Ohm Bridged - 4000 W
• Toroidal power transformer
• Magnetic circuit breaker on/off switch
• Cooled by variable speed fan with back-to-front airflow
• Mode selector switch for stereo, parallel and bridged-mono operation
• Inputs: Balanced female XLR, 1/4” TRS combi jacks
• Outputs: Speakon® and five-way binding posts
• Recessed, stepped attenuators
• 16-gauge steel chassis, cast aluminum front panel
• Five-year warranty

Powersoft X8

Powersoft X8 innovates and evolves the concept of the amplification platform though the integration of a worldwide compatible power-box and a full feature DSP inside the power amplifier.

The complete digital audio signal management system based on ARM Cortex A-8 processor and TI C6000 DSP platform heralds new and innovative level of signal processing, providing non-boolean routing and mixing, multi-stage equalization with raised-cosine, IIR and FIR filters, delay up to 4 s in input processing and 200 ms for time alignment, gain and polarity adjustment, crossover, peak limiters, TruePower limiters and Active DampingControl.

The power supply permits worldwide AC acceptance and direct connection to any regional power line configuration, it is now suitable to Single Phase, Bi-Phase or Three Phase operation from 85 VAC up to 440 VAC without need of manual selection. True Three Phase load balancing is directly achievable by the unit without any complex load assignment in the power distribution system design.

Main Features include:


• 6th generation fixed frequency switchmode output stage for high grade sound accuracy
• Compact size and high power density
• Modular construction allowing for rear panel customization
• AES3 digital inputs
• Two redundant Dante streams


• Non-boolean channel routing
• Input signal backup policy aimed to improve reliability against signal fault
• Signal grouping for speaker routing
• Built in WiFi remote management


• Hardware monitor available for fast local diagnostic
• Load impedance measurement / display for each channel
• Output power measurements / display for each channel
• Mains voltage and current measurements / display

Digital Signal Processing

• TI C6000 DSP platform architecture
• AD/DA converter: dual 24bit @ 96 kHz Tandem® architecture, 127 dB dynamic range, per channel
• Input/output independent equalizers per channel providing Raised-cosine, custom FIR, parametric IIR: peaking, hi/lo-shelving, all-pass, band-pass, band-stop, hi/lo-pass
• Crossovers: linear phase (FIR), hybrid (FIR-IIR), Butterworth, Linkwitz-Riley, Bessel: 6 dB/oct to 48 dB/oct (IIR)
• Input delay up to 4 s and output delay up to 200 ms for time alignment per channel
• Active DampingControl for cable compensation
• Power limiter (TruePower, RMS voltage, RMS current) + Peak Limiter

Peavey CS4080HZ

Peavey CSSeries showcases workhorse reliability. Over the years, these amps have benefited from some of Peavey’s most popular audio innovations, including its DDT compression/anti-clipping protection. With its 2 RU design and power points up to 4080 watts, this latest evolution of the CS Series is leaner, louder and lighter.

Main features include:

• 2 temperature-dependant variable speed fans
• 2040 watts (rms) per channel at 4 ohms
• 1250 watts per channel at 8 ohms
• 4080 watts at 8 ohms bridged
• 5-year warranty
• 2-rack-space stereo power amp featuring DDT
• Weight Unpacked: 47.60 lb(21.591 kg)
• Weight Packed: 53.00 lb(24.04 kg)
• Width Packed: 21”(53.34 cm)
• Height Packed: 22.5”(57.15 cm)
• Depth Packed: 6”(15.24 cm)

Crown XLS 2500

The XLS Series of power amplifiers from Crown define the standard for live sound systems with efficient performance, technology, and affordability. Its advantageous flexibility includes multiple inputs so that the user can plug in anything and play anywhere, along with several system setup configurations. The integrated crossovers and switch-mode power supply produce superior sound, and Peakx limiters protect the speakers. Weighing less than 12 pounds, it is much easier to set up and move from show to show. XLS is reliable, versatile and efficient amp.

Generating chest-thumping lows and crystal clear highs, the four models in the series – the XLS1000, XLS1500, XLS2000 and XLS2500 are engineered to meet any demanding audio requirements, reliably and within budget.

Main features include:

• XLS High Performance, Lightweight Class D amp weighs less than 11 lbs.
• Integrated PureBand Crossover System for better performance and control
• Peakx Limiters provide maximum output while protecting the users’ speakers
• XLR, 1/4”, RCA inputs provide outstanding flexibility
• Efficient forced-air fans prevent excessive thermal buildup
• Electronically balanced XLR inputs; touch proof binding post and Speakon outputs
• Precision detented level controls, power switch, power LED, and six LEDs which indicate signal, clip and fault for each channel

Yamaha PX10

PX series models are driven by a newly developed Class-D amplifier engine that concentrates functions into a single custom LSI chip and uses PLL technology to control transfer characteristics in real time, achieving impressive sound quality and power. This new single-chip architecture offers higher output and improved performance in a more lightweight yet reliable design. A combination of cutting-edge technology and an exhaustive component selection process make PX Series amplifiers supremely efficient amplifiers with low noise, reliable protection features and good sound quality. The versatile PX series power amplifiers lineup combines intelligent processing with high output power to meet the requirements of a vast range of sound reinforcement environments.

Main Features include:

• 2x 1000W at 8Ω
• 2x 1200W at 4Ω
• Newly developed Class-D amplifier engine with a custom LSI
• Flexible onboard PEQ, crossover, filters, delay, and limiter functions
• Yamaha Speaker presets
• Utlities for safe and secure operation