The Whitaker Brothers PS 400 2 represents a focused upgrade in professional audio power and reliability. It delivers clean, stable output for demanding studio and live environments while maintaining a compact chassis.
Designed for engineers who need consistent performance, this second-generation model refines thermal management and input flexibility. The result is a tool that blends modern specs with proven circuit topology.
| Model | Power Output | Channels | Key Feature |
|---|---|---|---|
| Whitaker Brothers PS 400 1 | 400 W per channel | 2 | Legacy flagship reliability |
| Whitaker Brothers PS 400 2 | 400 W per channel | 2 | Enhanced heat dissipation, modern protections |
| Standard Class-D Reference | 500 W per channel | 2 | Higher efficiency, optional network control |
| Compact Touring Amp | 300 W per channel | 2 | Reduced weight, shared cooling design |
Signal Path and Input Options
The signal path of the Whitaker Brothers PS 400 2 is optimized for low noise and wide bandwidth. Balanced XLR and unbalanced TRS inputs allow flexible source integration without sacrificing headroom.
Internal shielding and star grounding minimize hum when stage boxes and consoles share complex ground planes. Precision potentiometers and tight tolerance resistors contribute to consistent tonal balance across channels.
Amplifier Class and Efficiency
Engineered around a Class-D architecture, the PS 400 2 converts power with high efficiency and minimal heat generation. Switching modules are rated for continuous 400 W per channel operation at 4 ohm loads while preserving dynamic headroom.
Reduced thermal stress translates to longer service intervals and lower mounting requirements. Active power factor correction keeps input current clean and supports operation from varied local mains voltages.
Control, Metering, and Protection
A centralized control section provides gain, mute, and standby functions with clear LED feedback. Integrated metering displays both channel and aggregate output levels, helping operators maintain optimal headroom during complex events.
Built-in protections include thermal shutdown, overcurrent limiting, and DC offset detection. These features safeguard speakers and personnel while minimizing nuisance trips during demanding touring schedules.
Reliability, Build, and Serviceability
The enclosure uses reinforced steel panels and vibration-damped corner pads to survive road wear without compromising performance. Sealed connectors and conformal coating on PCBs guard against humidity and airborne contaminants in demanding backline environments.
Field-repairable modules allow technicians to replace discrete power stages without pulling the full unit from the rack. Detailed service documentation and widely available spare parts simplify long-term ownership for touring companies and permanent installs.
Technical Specifications
Examining the core specifications helps match the amplifier to venue and system requirements. The table below highlights the key numbers that define real-world capability.
| Specification | Whitaker Brothers PS 400 2 | Nominal Output @ 4 Ω | Typical Use Case |
|---|---|---|---|
| Channel Power | 400 W | 400 W | Full-range PA per side |
| Input Sensitivity | 1.1 V / 1.5 V switchable | Low for line sources | Compatible with mixers and processors |
| Frequency Response | 20 Hz – 20 kHz (±0.5 dB) | Full audio band | Critical music and speech |
| Impedance Range | 2 Ω – 16 Ω stable | 4 Ω nominal | Variety of speaker loads |
| Protection Features | Thermal, overcurrent, DC | Safe in touring conditions | Minimize downtime |
Installation, Placement, and Setup
Strategic placement within racks and line arrays ensures consistent cooling and balanced load distribution across both channels. Maintain clear airflow at the rear and top vents to preserve rated output under continuous operation.
RCA and speakon output labeling simplifies patching, while front-panel indicators allow quick checks during live shows. Integrators often run impedance scans to confirm that the connected speakers stay within the stable range.
User Experience and Feedback
Field reports highlight clean transient response even at high SPL, with minimal crossover artifacts when stacked with subwoofers. Sound teams appreciate the intuitive gain structure, which reduces channel strip adjustments during changeovers.
Consistent alignment between channels makes stereo imaging predictable for critical applications such as broadcast and acoustic reinforcement. The overall consensus positions the PS 400 2 as a reliable workhorse for midsize venues and premium installed systems.
Key Takeaways and Recommendations
- Verify speaker impedance stays within the 2 Ω – 16 Ω stable range for each channel.
- Enable output limiting only when necessary; prefer ample headroom for dynamic content.
- Use balanced XLR runs to maximize noise rejection in long cable runs.
- Schedule routine airflow checks to keep thermal performance consistent on long tours.
- Document gain structure and protection settings when integrating into larger line arrays.
FAQ
Reader questions
How does the PS 400 2 perform with complex stage monitor setups?
It maintains low noise and stable voltage even with multiple monitor mixes, keeping stage wedges clear without pumping.
What protection features are active when running at high ambient temperatures?
Thermal shutdown and forced airflow derating work together to preserve components and limit sudden power loss.
Can the PS 400 2 be networked for remote control in large venues?
Yes, optional firmware and control modules provide remote configuration, metering, and fault logging via standard LAN.
What maintenance schedule is recommended for touring companies?
Quarterly visual inspections and annual professional calibration help sustain spec and catch fan or connector wear early.