DSP-Plate Amplifiers

With Pascal Amp Modules And Dante Support

DSP-Plate Amplifiers

High-Quality Amplifier Solution.

The PPA series provides a high-quality DSP-powered amplifier solution for active loudspeakers. It features Pascal high-power modules, analog, digital and Dante inputs and is available in different configurations for various kinds of speakers. Signal processing is done in 32 bit floating point on an Analog Devices Sharc DSP and uses dual range ADC for high dynamic input range. Besides usual IIR X-Overs and EQs, also FIR filters are available for linear phase system response. An advanced limiter concept protects speakers and prevents amp and PSU overheating. Programming can be done via USB and the included touch display (see bottom of this page). A sophisticated user interface for programming and easy-to-use FIR filter creation is provided.

Please, note that we can only deal with commercial customers. Here you can download a leaflet. More Downloads on our download page.

Features

  • 32-bit floating-point signal processing using a Sharc-DSP
  • linear phase FIR and IIR-Crossovers, EQs
  • Advanced Limiter concept with
  • dual band look ahead Peak-Limiter in each output
  • dual band RMS limiter in each output
  • Overall power supply limiter
  • USB connection for programming via remote software
  • Touchscreen for controlling the unit
  • High dynamic range (128 dB(A) dual range converter input, 112 dB(A) output)
  • Analog, AES/EBU and Dante input
  • Pascal high-power amplifier modules and PSU
  • 11 models with active cooling
  • 7 models with passive cooling

System Design and User Operation

The units can be programmed with several system presets by the system developer.

End users are allowed to adjust room EQs, gains and delays in a user mode and store user presets without touching the system presets.

OEM customers can provide keyfiles to enable GUI features for end users. The touch panel shows level meters, limiter operation and allows switching presets and inputs.

OEM Solutions and Customization

For high volume customers, Four Audio supplies custom designs with reduced features tailored to the needs of the customer. E.g., standalone operation of DSP and amplifier without using the touch
display is possible.

Contact Four Audio for more information.

Signal Processing
Limiters Look-ahead peak limiter, RMS limiter, both dual band overall power supply limiter
EQs Bell / notch filter, allpass, shelving filter 6dB / 12 dB
X Overs Bessel, Butterworth, Linkwitz-Riley, Critical
FIR linear phase X-over and linear phase loudspeaker equalization
Others input delay, output delay, phase inversion, gain

Software

  • GUI Software with Developer and User modes to create developer and user presets
  • Interactive operation on channel parameters and EQing
  • Advanced easy-to-use FIR generation from speaker measurements with defined latency
Common Technical Data
Max input voltage 23 dBu
Analog input SNR 128 dB(A)
Output SNR 112 dB(A)
Mains input voltage 85 – 265 VAC
Protection All models provide over current, DC, temperature and high frequency protection. The 1600/2200 models additionally feature over-/undervoltage protection.

Overview of passively cooled PPA modules

  • Full metal housing, front plate with cooling ribbons
  • PC-IEC inlet with power switch and mains filter
  • Must be mounted upright
Output Power [W@4Ohms] Minimum Load SE [Ohms] Dimensions
Model Total Out 1 Out 2 Out 3 Out 4 Out 1 Out 2 Out 3 Out 4 [mm]
PPA 500-1 PC-IEC 500 500 – – – 2.7 – – – 135×318
PPA 500-2 PC-IEC 500 500 150* – – 2.7 8 – – 135×318
PPA 500-3 PC-IEC 500 500 150* 500 – 2.7 8 2 – 135×386
PPA 500-4 PC-IEC 500 500 150* 500 500 2.7 8 2 2 135×386
PPA 1000-2 PC-IEC 1000 500 500 – – 2 2 – – 135×331
PPA 1000-3 PC-IEC 1000 500 500 500 – 2 2 2 – 135×411
PPA 1000-4 PC-IEC 1000 500 500 500 500 2 2 2 2 135×411
PPA 1600-2 PC-IEC 1500 810 810 – – 2 2 – – 135×331
PPA 1600-4 PC-IEC 1500 810 810 810 810 2 2 2 2 135×436
* @8 Ohms

Overview of actively cooled PPA modules

  • Neutrik Powercon True 1 connector
  • Constantly slow spinning silent HQ fan
Output Power [W@4Ohms] Minimum Load SE [Ohms] Dimensions
Model Total Out 1 Out 2 Out 3 Out 4 Out 1 Out 2 Out 3 Out 4 [mm]
PPA 500-1 AC 500 500 – – – 2.7 – – – 135×324
PPA 500-2 AC 500 500 150* – – 2.7 8 – – 135×324
PPA 500-3 AC 500 500 150* 500 – 2.7 8 2 – 135×405
PPA 500-4 AC 500 500 150* 500 500 2.7 8 2 2 135×405
PPA 1000-2 AC 1000 500 500 – – 2 2 – – 135×380
PPA 1000-3 AC 1000 500 500 500 – 2 2 2 – 135×452
PPA 1000-4 AC 1000 500 500 500 500 2 2 2 2 135×452
PPA 1600-2 AC 1500 810 810 – – 2 2 – – 135×380
PPA 1600-4 AC 1500 810 810 810 810 2 2 2 2 135×477
PPA 2200-1 AC 2200 2000 – – – 4 – – – 205×470
PPA 2200-2 AC 2200 2000 800 – – 4 4 – – 205×510
PPA 2200-3 AC 2200 2000 800 800 – 4 4 4 – 205×550
* @8 Ohms

PPA Presentation Video

PPA Display with Touch Panel Introduction

Contact

Contact for all types of requests and offers.