VR Series 2-Channel Class D Professional Power Amplifiers

OMB VR Series 2-Channel Class D Professional Power Amplifiers are designed for PA systems, live sound, touring, theaters, venues and professional audio installations requiring reliable stereo amplification with flexible output power.

The series includes VR300, VR400, VR600, VR800 and VR1000 models, providing output from 300W × 2 to 1000W × 2 at 8Ω. Each model supports 4Ω stereo operation and 8Ω bridge mode, allowing system designers to select an amplifier according to loudspeaker impedance, power handling and required system headroom.

With high-efficiency Class D amplification, balanced XLR inputs, low distortion, fan cooling and comprehensive protection, the VR Series provides a practical amplification platform for professional full-range speakers, PA cabinets and other sound reinforcement systems.

Tell OMB your loudspeaker impedance, RMS power, required quantity and application.

Our team can help you select the appropriate VR300, VR400, VR600, VR800 or VR1000 amplifier and provide specifications, technical support and quotation information for your professional audio project.

● 2-channel Class D professional power amplifier design
● Five power options from 300W × 2 to 1000W × 2 at 8Ω
● Stable 4Ω stereo operation
● 8Ω bridge mode for higher mono output
● Balanced 3-pin XLR audio inputs
● Full-range 20Hz–20kHz frequency response
● THD below 0.05%
● Damping factor greater than 300
● Intelligent fan cooling
● Professional 19-inch 2U rack-mount chassis
● Short-circuit, overheating, overload and DC fault protection
● 115V / 230V versions available for different markets

Choosing a professional amplifier should not be based only on the highest wattage available.

The correct model should be selected according to the loudspeaker impedance, RMS power rating, required headroom and operating environment.

Match the Loudspeaker Impedance

The VR Series supports both 8Ω and 4Ω stereo loads.

Before selecting an amplifier, confirm the nominal impedance of each connected loudspeaker and ensure that the total load remains within the supported range.

For example, the VR1000 provides:

● 1000W × 2 at 8Ω
● 1500W × 2 at 4Ω
● 3000W × 1 at 8Ω in bridge mode

The correct configuration depends on the speaker system being driven.

Consider Loudspeaker Power Handling

Amplifier output should be matched with the continuous power handling of the loudspeaker.

An amplifier with insufficient output may be driven into clipping when additional SPL is required, while an oversized amplifier must be operated with appropriate gain structure and system protection.

Send OMB your loudspeaker RMS power and impedance if you need assistance selecting between VR300, VR400, VR600, VR800 and VR1000.

Class D Amplification for Professional Audio

Class D amplification provides high power efficiency within a compact chassis, making it well suited to professional rack systems.

For touring and installed sound systems, improved efficiency can help reduce unnecessary heat generation while maintaining high output capability.

This is especially valuable where several amplifiers are installed in the same rack and must operate for long periods.

The VR Series combines Class D amplification with active cooling to provide a compact 2U solution for professional audio systems.

Stereo and Bridge Operating Modes

A 2-channel power amplifier can be used in different configurations depending on the loudspeaker system.

Stereo Mode

In stereo operation, Channel A and Channel B independently drive separate loudspeakers.

Typical applications include:

● Left and right PA speakers
● Stereo full-range systems
● Two independent speaker cabinets
● Stage and event sound systems

Bridge Mode

Bridge mode combines both amplifier channels to provide a higher-power mono output.

This can be useful when one higher-power loudspeaker requires more output than a single channel can provide.

Bridge mode should only be used with the correct speaker impedance and wiring configuration.

Balanced XLR Inputs for Professional Signal Transmission

The VR Series uses balanced 3-pin XLR inputs with a 20kΩ input impedance.

Balanced connections are widely used in professional audio because they are suitable for longer cable runs and help reduce unwanted noise in complex PA systems.

The amplifiers can be integrated with:

● Professional audio mixers
● DSP speaker processors
● Digital signal processors
● Audio management systems
● Other professional balanced audio sources

Input sensitivity is rated at 1.2V, allowing straightforward integration with common professional audio equipment.

Low Distortion and Speaker Control

The VR Series provides less than 0.05% total harmonic distortion across the specified operating range.

A damping factor greater than 300 also helps the amplifier maintain control over connected loudspeaker drivers.

These characteristics are important in professional sound reinforcement systems where clean signal reproduction and controlled speaker response are required at higher operating levels.

Cooling and Protection for Professional Use

Professional amplifiers may operate continuously during concerts, conferences, performances and fixed installations.

The VR Series uses fan-assisted cooling to manage internal temperature during extended operation.

Protection functions include:

● Short-circuit protection
● Open-circuit protection
● Overheating protection
● RF protection
● Overload protection
● DC fault protection

These protection systems help reduce the risk of amplifier or loudspeaker damage under abnormal operating conditions.

Live Sound and Events

Suitable for driving professional PA loudspeakers used for concerts, performances, corporate events and mobile sound reinforcement.

Touring Sound Systems

The 2U rack-mount format allows multiple amplifiers to be integrated into professional touring racks.

Theaters and Auditoriums

Different VR Series power levels can be selected according to the loudspeaker zones and required system output.

Clubs and Entertainment Venues

The series can power professional full-range loudspeakers in music and entertainment environments requiring reliable continuous amplification.

Professional PA Installations

Balanced inputs, rack-mount design and multiple output power options make the series suitable for system integrators building professional sound reinforcement systems.

1. Crisp Fidelity & Total Protection: <0.05% distortion, crisp and clean, Fidelity that makes every note keen. Short-circuit, overheat—all threats repel; your amp stays safe, no need to dwell. 

2. Smart Cooling & Tight Damping: Variable fan adjusts the heat's pace, Stays cool for hours, steady in space. Damping >300, tight and true, speakers respond with clarity new. 

3. Global Ready & All-Scene Steady: 115V/230V, wherever you roam, Power fits your zone, no need to comb. Theaters, stadiums, outdoor shows - This amp shines where the big sound goes. 

4. Clean Input & Smooth Pairing: 20KΩ balanced input, strong and sure, Long-cable clarity, pure and mature. 1.2V sensitivity, smooth and neat; Pairs with preamps, no skip, no beat. 

5. Sturdy Build & Clean Power: Sturdy binding posts handle high-load demand, Outdoor, indoor—they stand the grand. LLC resonance cuts interference's noise; Clean power flows, no disruptive poise. 

6. Compact Size & Fast Response: 19-inch rack fit, sleek and small, Saves space in your rig, standing tall. 40V/μs slew rate, fast and precise; Transient sounds hit, sharp and nice. 

7. Full Spectrum & Flexible Scale: 20Hz-20kHz, ±3dB span, Full-spectrum sound, a perfect plan. Bridged mode boosts power, scale up or down; Adapt to your space, no frown. 

8. Mighty Power & Class D Might: VR1000 strikes with 1000W×2 (8Ω) glow, Bridged to 3000W—let the audio grow. Class D power fuels the fire bright: High efficiency, low drain, day and night.