Quest Commercial PB-4120D: 4-Channel 4 x 120 W Class-D Power Amplifier

About the Quest Commercial PB-4120D: 4-Channel 4 x 120 W Class-D Power Amplifier

The Quest Commercial PB-4120 and 4300D are versatile and efficient Class-D, digital multi-Channel Power Amplifiers of advanced design, able to drive 70 / 100 V line loudspeaker systems directly as well as low impedance 4 / 8 ohms speaker loads.  The PB-4120D can deliver 120 W RMS per-Channel, and the PB-4300D can deliver 300 W RMS per-Channel.  The PB-series advanced technology, clear sound, lightweight and reliable performance makes it ideal for any distributed sound system installation.

Features:

• The Amplifiers deliver either 120 / 300 W of clean power per-Channel at 70 / 100 V and 4 ohms
• Class-D Amplifier operating at 85 % efficiency using switching power supplies. The PB-series Amplifiers generate virtually no heat, thanks to their low current draw.
• Built in 70 / 100 V output transformers through flat frequency response from 40 hz to 20 kHz provide constant voltage for distributed speaker systems.
• Independent input level controls for each-Channel allow precise adjustments.
• Clean, crisp sound, Impressive audio specifications such as < 0.3 % THD, dynamic range of 105 dB, crosstalk of > 70 dB, and frequency response of 50 hz - 18 kHz guarantee ultra clean sound quality.
• LED signal indicators for each-Channel continuously display Power output levels and allow you to correct for overloading (clipping) conditions.
• Forced air cooling via internal fan provides reliable performance without thermal and overheating problems.
• Input and output connections for each-Channel are made using euro block connectors to accommodate both balanced and unbalanced signals sources and which accept 12 gauges wire.
  
• CSA / UL approved.
• Class-D & switching Power supply: PB-4120D @ 120 V / 5.8 A; PB-4300D @ 120 V / 13.9 A
• The PB-series Amplifiers can be mounted in any standard 19" rack (taking just 2 rack spaces), making it easy to integrate into any fixed or traveling PA rig.
• Housed in a double rack space (2 RU) 19" rack mounting housing.
• 3 years warranty.

Specifications:

• Rated Power (1 kHz, 1 % THD + N ): 120 W x 4 (70 / 100 V); 60 W x 4 (8 Ω); 120 W x 4 (4 Ω) 
• Output impedance: 4 Ω, 100 V (83.3 Ω) / 70 V (40.8 Ω)
• Input sensitivity: 1 VRMS
• Input impedance: 10 kΩ balanced
• Frequency response: 50 hz - 18 kHz
• Total harmonic distortion + noise: < 0.3 %
• Signal to noise ratio: > 90 dB
• Common model rejection: 70 dB
• Crosstalk: > 70 dB
• High pass filter switch: 400 hz
• Protection: DC short circuit, overheating and load
• Cooling system: temperature controlled fan
• Amplifier technology: Class-D
• Power supply: 120 V AC, 50 / 60 hz
• Weight (net): 20.3 lbs (9.2 kg)
• Unit dimension (W x H x D): 19 x 14.8 x 3.5" (483 x 375 x 89 mm)