Essential Blaze by Sonance PowerZone Connect 504 – 500W 4-Channel DSP Amplifier in a Half-Rack Chassis
The Blaze by Sonance PowerZone Connect 504 is a 500W DSP-enabled Class-D amplifier that squeezes four configurable output channels into an ultra-compact half-rack 1RU chassis. It is the most power-dense model in the half-rack PowerZone Connect 1U lineup, delivering 125W per channel in Lo-Z mode or 250W per channel in Hi-Z — giving installers serious output from a footprint that fits where full-rack units simply cannot.
Built on the same Pascal UMAC™ Class-D platform and PowerZone™ Control web app as every other model in the range, the PowerZone Connect 504 brings full-matrix DSP, hybrid Lo-Z/Hi-Z operation, and automatic power-sharing to four-zone commercial installations. For integrators across Africa working on restaurants, small retail spaces, meeting rooms, or distributed paging systems, this amplifier hits a sweet spot between channel count, output power, and physical size.
Design and Construction of the Blaze by Sonance PowerZone Connect 504
The standout feature of the PowerZone Connect 504 is its half-rack width chassis. At 44 × 220 × 319 mm (1.7″ × 8.7″ × 12.6″) and just 2.8 kg (6.2 lbs), it occupies half the faceplate of a standard 19″ rack unit. Two 504s can sit side by side in a single rack space, or you can pair one with a PowerZone Connect 122 or 252 for mixed channel configurations. Optional rack ears, extension plates, and full rack support kits are available separately.
Under the hood, the amplifier uses Pascal’s UMAC™ Class-D output stage — a full-bandwidth PWM modulator engineered for ultra-low distortion. The UREC™ universal mains switch-mode power supply features Power Factor Correction (PFC) and an integral standby converter, accepting 100–240V AC at 50–60 Hz for universal deployment without voltage adapters.
Protection circuits cover short circuit, DC fault, under-voltage, thermal runaway, and overload conditions. Standby draw is below 0.5W, meeting both ErP and Energy Star compliance standards. The unit is UL listed, and Blaze backs it with a five-year warranty.
Performance and Applications for the PowerZone Connect 504
In Lo-Z mode, each of the four output channels delivers 125W into 4Ω or 8Ω loads. That is considerably more headroom per channel than the 8-channel models — making the 504 a strong choice when you need fewer zones but more power per zone. Switch to Hi-Z and the unit reconfigures as two channels at 250W each, driving 70V or 100V distributed speaker lines across longer cable runs.
Automatic power-sharing technology lets the amplifier redistribute up to 2 × 250W across paired output channels proportionally, so zones with heavier speaker loading draw the power they need without manual gain adjustments. This is particularly useful in mixed-use venues where one zone may have significantly more ceiling speakers than another.
The built-in PowerZone™ Control web app provides the same full-matrix DSP found on the 8-channel models: multizone routing, input mixing, priority and ducking for paging, restriction, parametric EQ on inputs and outputs, high-pass filtering, speaker presets, delay, a sine generator for commissioning, and Wall-S1 controller configuration. Access it from any browser via the built-in Wi-Fi or the RJ45 network port.
Audio quality is consistent with the broader 1U family: signal-to-noise ratio exceeds 100 dB (A-weighted), THD+N sits below 0.05% across 20 Hz – 20 kHz, and frequency response holds within +0/−0.25 dB into an 8Ω load. Typical applications include small-to-medium restaurants and bars, boutique retail stores, hotel lobbies, fitness studios, education facilities, meeting rooms, and compact houses of worship.
Specifications – Blaze by Sonance PowerZone Connect 504
- Total System Power: 500W
- Output Channels: 4 (Lo-Z) / 2 (Hi-Z)
- Output Power (Lo-Z, 4Ω/8Ω): 4 × 125W
- Output Power (Hi-Z, 70V/100V): 2 × 250W
- Powershare (up to): 2 × 250W across all channels
- Amplifier Topology: Pascal UMAC™ Class-D, full-bandwidth PWM modulator
- Output Voltage: 45Vrms (single-ended) / 70V–100V (Hi-Z)
- Signal-to-Noise Ratio: > 100 dB (A-weighted, 20 Hz – 20 kHz, 8Ω load)
- THD+N (typical): < 0.05% (20 Hz – 20 kHz, 8Ω, 3 dB below rated power)
- Frequency Response: 20 Hz – 20 kHz (+0/−0.25 dB, 8Ω, 3 dB below rated power)
- Power Consumption: 150W
- Standby Consumption: < 0.5W (ErP & Energy Star compliant)
- Power Supply: UREC™ universal mains SMPS with PFC
- Operating Voltage: 100–240V AC, 50–60 Hz
- Operating Temperature: 0–40°C
Connectivity and Control
- Analogue Inputs: 4 × RCA (unbalanced)
- Digital Audio: 1 × stereo S/PDIF input/output
- Network: RJ45 Ethernet port + built-in Wi-Fi (for PowerZone™ Control web app)
- GPIO: Configurable general-purpose input/output (Euroblock connector)
- Outputs: 4 × Lo-Z (Euroblock) or 2 × Hi-Z
- Dante™ Option: Available as the PowerZone Connect 504D variant (sold separately)
- DSP Control: PowerZone™ Control web app (built-in) — full-matrix routing, multizone, input mixing, priority/ducking, restriction, parametric EQ, HPF, speaker presets, delay, sine generator, Wall-S1 configuration
Protection and Safety
- Protection Circuits: Short circuit, DC fault, under-voltage, thermal, overload
- Safety Certifications: UL listed audio equipment
- Energy Compliance: ErP 1275/2008/EC and Energy Star
- Warranty: 5 years
Physical Dimensions and Mounting
- Form Factor: Half-rack width, 1RU height
- Dimensions (H × W × D): 44 × 220 × 319 mm (1.7″ × 8.7″ × 12.6″)
- Weight: 2.8 kg (6.2 lbs)
- Mounting Options: Adhesive rubber feet included; optional rack ears, extension plates, and full rack support kits (available separately)
Conclusion
The Blaze by Sonance PowerZone Connect 504 is the workhorse of the half-rack PowerZone Connect lineup. With 500W of total system power across four channels, 125W per output in Lo-Z or 250W in Hi-Z, and the full PowerZone™ Control DSP suite built in, it delivers the same professional feature set as the full-rack 8-channel models in a chassis that is half the width and under 3 kg.
For installers and integrators across Africa, the PowerZone Connect 504 is ideal for four-zone venues where per-channel power matters more than channel count. Two units fit side by side in a single rack space for eight channels, or pair one with a PowerZone Connect 122 for a mixed two-plus-four-zone setup. The optional 504D variant adds Dante™ compatibility for AoIP-networked installations. Backed by universal mains input, comprehensive protection, and a five-year warranty, it is a dependable building block for scalable commercial audio systems.
VIEW MORE BLAZE BY SONANCE PRODUCTS HERE.
About Blaze by Sonance.
Blaze by Sonance (formerly Blaze Audio) was founded in Copenhagen, Denmark in 2020 as a brand of Pascal A/S, a global leader in professional amplifier electronics. Acquired by Sonance in May 2025, Blaze brings Danish precision engineering and a focused product lineup of high-performance amplifiers and sound reinforcement loudspeakers to the installed sound market.
