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SKU: C2216-162

Quest PB-4120D 4x120W Power Amp 70V 4-8 Ohms

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Description

Professional-grade power amplifier delivering 4x120W output at 70V or 4-8 ohms impedance. The Quest PB-4120D combines compact design with robust amplification, ideal for commercial audio installations, venues, and distributed speaker systems. Features reliable performance for background music, paging, and multi-zone audio applications. Built for durability and consistent sound reinforcement in demanding environments. Read more

Features

  • 4-Channel Independent Operation: Features four fully independent channels capable of driving mixed Hi-Z (70V/100V) and Low-Z (4Ω/8Ω) loads simultaneously.
  • High-Efficiency Class-D Topology: Runs at over 85% operational efficiency using an advanced switching power supply to minimize heat and current draw.
  • Flexible Power Delivery: Delivers 120W RMS per channel across 70V, 100V, or 4-ohm speaker configurations.
  • Per-Channel Diagnostics: Front-panel LED meters continuously monitor real-time signal presence, output levels, clip status, and protection modes.
  • Industrial Euroblock Connectivity: Equipped with balanced/unbalanced 3-pin Phoenix inputs and high-current screw-terminal outputs for clean commercial wiring.

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Professional-grade power amplifier delivering 4x120W output at 70V or 4-8 ohms impedance. The Quest PB-4120D combines compact design with robust amplification, ideal for commercial audio installations, venues, and distributed speaker systems. Features reliable performance for background music, paging, and multi-zone audio applications. Built for durability and consistent sound reinforcement in demanding environments. Read more

Features

  • 4-Channel Independent Operation: Features four fully independent channels capable of driving mixed Hi-Z (70V/100V) and Low-Z (4Ω/8Ω) loads simultaneously.
  • High-Efficiency Class-D Topology: Runs at over 85% operational efficiency using an advanced switching power supply to minimize heat and current draw.
  • Flexible Power Delivery: Delivers 120W RMS per channel across 70V, 100V, or 4-ohm speaker configurations.
  • Per-Channel Diagnostics: Front-panel LED meters continuously monitor real-time signal presence, output levels, clip status, and protection modes.
  • Industrial Euroblock Connectivity: Equipped with balanced/unbalanced 3-pin Phoenix inputs and high-current screw-terminal outputs for clean commercial wiring.

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About the Quest PB-4120D 4x120W Power Amp 70V 4-8 Ohms

The Quest Commercial PB-4120D is a high-performance 4-channel Class-D power amplifier engineered for distributed sound reinforcement in commercial, educational, and institutional environments. Generating up to 120 watts RMS per channel, this 2U rack-mount unit provides high power density and energy efficiency. Its versatile channel architecture allows installers to configure each output independently for either constant-voltage 70V/100V speaker lines or low-impedance 4-ohm/8-ohm loads, making it an ideal solution for complex multi-zone installations.

Built for maximum operational reliability, the PB-4120D features transformerless Class-D design backed by forced-air temperature-controlled cooling. Integrated protection circuitry safeguards the system against short circuits, thermal overload, and DC faults. With rear-panel attenuators, high-pass filter switches, and Phoenix terminal connections, the amplifier provides smooth setup and dependable, continuous performance in high-demand audio distribution systems.

Key Features

  • 4-Channel Independent Operation: Features four fully independent channels capable of driving mixed Hi-Z (70V/100V) and Low-Z (4Ω/8Ω) loads simultaneously.
  • High-Efficiency Class-D Topology: Runs at over 85% operational efficiency using an advanced switching power supply to minimize heat and current draw.
  • Flexible Power Delivery: Delivers 120W RMS per channel across 70V, 100V, or 4-ohm speaker configurations.
  • Per-Channel Diagnostics: Front-panel LED meters continuously monitor real-time signal presence, output levels, clip status, and protection modes.
  • Industrial Euroblock Connectivity: Equipped with balanced/unbalanced 3-pin Phoenix inputs and high-current screw-terminal outputs for clean commercial wiring.

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Quest PB-4120D 4x120W Power Amp 70V 4-8 Ohms Specs

Amplifier Class
Class-D Digital Power Amplifier
Output Channels
4 Independent Channels
Rated Output Power (70V / 100V)
120W RMS x 4 Channels
Rated Output Power (4 Ohms)
120W RMS x 4 Channels
Rated Output Power (8 Ohms)
60W RMS x 4 Channels
Frequency Response
50 Hz – 18 kHz
Total Harmonic Distortion + Noise (THD+N)
< 0.3% at 1 kHz
Signal-to-Noise Ratio (SNR)
> 90 dB
Crosstalk
> 70 dB
Input Sensitivity
1.0 Vrms
Input Impedance
10 kOhms (Balanced)
High-Pass Filter Switch
400 Hz
Audio Input Connectors
3-Pin Balanced Euroblock (Phoenix)
Audio Output Connectors
Screw-Terminal Barrier Strip / Euroblock
Protection Circuitry
Overcurrent, Short Circuit, Thermal Overload, DC Fault

Key Features

  • 4-Channel Independent Operation: Features four fully independent channels capable of driving mixed Hi-Z (70V/100V) and Low-Z (4Ω/8Ω) loads simultaneously.
  • High-Efficiency Class-D Topology: Runs at over 85% operational efficiency using an advanced switching power supply to minimize heat and current draw.
  • Flexible Power Delivery: Delivers 120W RMS per channel across 70V, 100V, or 4-ohm speaker configurations.
  • Per-Channel Diagnostics: Front-panel LED meters continuously monitor real-time signal presence, output levels, clip status, and protection modes.
  • Industrial Euroblock Connectivity: Equipped with balanced/unbalanced 3-pin Phoenix inputs and high-current screw-terminal outputs for clean commercial wiring.

Already own this item and want to sell it?

Click here to sell your item

FAQs about Quest PB-4120D 4x120W Power Amp 70V 4-8 Ohms

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