ASHLY PEMA 4125.70 Network Power Amp 4 x 125W @ 70V Constant Voltage w/ 8x8 Protea DSP

Product Overview

The Ashly PEMA 4125.70 is a 4-channel, 125W-per-channel Protea-Equipped Media Amplifier configured for 70V constant-voltage distributed audio systems, integrating a 32-bit SHARC DSP engine, 8x8 Protea DSP processor, 8 built-in microphone preamps, and a Class-D amplifier in a single 2U rack-mount unit. As a complete one-box solution for smaller commercial AV installations, the PEMA 4125.70 replaces separate mixer, DSP, and amplifier components for up to 4 audio zones in conference rooms, training rooms, and multi-purpose commercial spaces. The unit supports both Dante and CobraNet option cards for AoIP integration and includes advanced DSP features including automatic feedback suppression, ambient noise compensation, and a real-time clock with event scheduling for fully automated daily operation. With 500W total output power and full Protea DSP functionality, the PEMA 4125.70 is an efficient and scalable commercial zone amplifier for 70V distributed audio systems.

Product Description

The PEMA 4125.70 delivers 4 channels of 125W each into 70V constant-voltage speaker systems, providing 500W total output for commercial spaces with moderate distributed speaker coverage requirements. The 8-in x 8-out matrix on the 32-bit SHARC processor routes any input to any output with full Protea DSP processing including FIR filter capability, EQ, dynamics, crossover, delay, and a built-in signal generator for test and noise masking applications. Eight balanced input channels are software-selectable for microphone or line level, with all eight channels including built-in microphone preamps. Channel 1 can be configured for transformer-isolated TEL-PBX level input for telephone paging integration. Eight pairs of summed-mono RCA connectors provide connections for consumer line-level sources. The real-time clock with event scheduler enables automated daily operation including scheduled preset changes, standby commands, and power management without manual intervention. Hot-plug DSP placement allows changes to the processing chain without interrupting live audio, and automatic DHCP network configuration reduces installation setup time. Lockable front panel controls and multi-level software security with password protection prevent unauthorized changes. The PEMA 4125.70 is built in the United States and supports both Dante and CobraNet option cards for network audio integration.

Key Features

• 4-Channel 70V Output — 125W per channel (500W RMS total) for constant-voltage distributed speaker systems.
• 32-Bit SHARC DSP — 96kHz or 48kHz operation with 24-bit A/D and D/A; FIR filter capable.
• 8-Input Matrix Processor — Full 8x8 matrix routing with per-channel Protea DSP processing.
• 8 Built-In Mic Preamps — Software-selectable mic/line on all channels.
• Real-Time Clock and Event Scheduler — Automated daily operation including preset changes and power management.
• Hot-Plug DSP — Insert or modify DSP processing chain without stopping live audio.
• Network Audio Options — Supports Dante and CobraNet option cards.
• Telephone/PBX Input — Channel 1 configurable for TEL-PBX level for phone paging.
• Class-D Efficiency — Over 80% energy efficient with switching power supply.
• Multi-Level Software Security — Password-protected access with lockable front panel controls.

Typical Applications

• Conference rooms and boardrooms with 4-zone 70V speaker coverage
• Training rooms and commercial meeting spaces
• Small houses of worship with distributed 70V audio
• Multi-purpose rooms requiring scheduled audio automation
• Government meeting rooms with paging requirements

Technical Specifications

Frequently Asked Questions

How does the PEMA 4125.70 differ from the PEMA 4125.70D?

The PEMA 4125.70 is the base model without a network audio option card installed. The PEMA 4125.70D includes a factory-installed OPDante card for immediate Dante network audio connectivity.

When is the PEMA 4125.70 a better choice than the PEMA 4250.70?

The PEMA 4125.70 provides 125W per channel (500W total), while the PEMA 4250.70 provides 250W per channel (1000W total). Choose the 4125.70 when the speaker system load per zone requires less power, which is typical in installations with smaller 70V speakers or fewer speakers per zone.

Does the PEMA 4125.70 include DSP?

Yes. A full 32-bit SHARC Protea DSP engine is integrated, providing FIR filtering, EQ, dynamics, crossover, delay, and matrix routing on all inputs and outputs.

Can the PEMA 4125.70 handle automated operation?

Yes. The real-time clock with event scheduler allows fully automated daily operation including scheduled preset changes, standby activation, and power cycling without manual intervention.

What is the telephone/PBX input used for?

Channel 1 can be configured for transformer-isolated TEL-PBX level input, which connects the amplifier directly to a phone system for paging announcements over the distributed speaker system.