ASHLY PEMA 4250.70 Power Amp 4x250W @ 70V Constant Voltage with 8x8 Protea DSP

Product Overview

The Ashly PEMA 4250.70 is a 4-channel, 250W-per-channel Protea-Equipped Media Amplifier configured for 70V constant-voltage distributed audio systems, with an integrated 8x8 Protea DSP audio processor, 8 built-in microphone preamps, and Class-D amplifier in a single 2U rack-mount unit. Designed as a complete network zone amplifier for commercial AV installation, the PEMA 4250.70 is suited for smaller-scale 70V distributed audio systems in conference rooms, training rooms, and multi-purpose commercial spaces where four amplifier zones are sufficient. The unit supports both Dante and CobraNet network audio option cards, providing flexibility for AoIP integration on either protocol. With 1000W total output power and full Protea DSP functionality including gain-sharing automatic microphone mixing, automatic feedback suppression, and event scheduling, the PEMA 4250.70 handles complete audio system requirements from a single device.

Product Description

The PEMA 4250.70 delivers 4 channels of 250W each into 70V constant-voltage speaker systems, providing 1000W total output for distributed audio across commercial facilities with up to four speaker zones. The 8-in x 8-out matrix mixer provides complete routing flexibility, allowing any of the eight inputs to be assigned to any output or combination of outputs, with the 32-bit SHARC DSP engine processing every signal with FIR filter capability, EQ, dynamics, crossover, delay, and metering. Eight built-in microphone preamps with 15V phantom power support direct microphone connections, and the gain-sharing automatic microphone mixer manages multiple open mic channels in conference and presentation environments. The automatic feedback suppressor reduces setup time and provides protection during live use, while ambient noise detection and automatic level adjustment maintain consistent perceived loudness throughout the day. A real-time clock with event scheduler supports fully automated daily operation without manual intervention, including scheduled preset changes and power management. The unit accepts both Dante and CobraNet network audio option cards, making it adaptable to either AoIP standard in use at the facility. Class-D amplifier topology with switching power supply delivers over 80% energy efficiency, and the standard 10/100 Ethernet interface provides remote control and monitoring through Ashly Protea NE software.

Key Features

• 4-Channel 70V Output — 250W per channel (1000W RMS total) for constant-voltage distributed speaker systems.
• 8x8 Matrix Mixer — Full matrix routing with 32-bit SHARC DSP on all inputs and outputs.
• FIR Filter Capable — Linear-phase FIR filtering for advanced loudspeaker alignment.
• 8 Built-In Mic Preamps — With 15V phantom power for direct condenser microphone connections.
• Automatic Mic Mixing — Gain-sharing automatic microphone mixer for multi-mic environments.
• Automatic Feedback Suppressor — Built-in suppression reduces setup time and prevents feedback events.
• Ambient Noise Compensation — Automatic output adjustment based on room ambient noise levels.
• Real-Time Clock and Scheduler — Automated daily operation including scheduled presets and power management.
• Network Audio Options — Supports Dante and CobraNet option cards for AoIP connectivity.
• 96kHz/48kHz Operation — 24-bit A/D and D/A conversion with selectable sample rates.
• Class-D Efficiency — Over 80% efficient with switching power supply.

Typical Applications

• Conference rooms and boardrooms with 70V distributed speakers
• Training rooms and commercial meeting spaces
• Multi-purpose rooms requiring scheduled audio automation
• Small houses of worship with distributed speaker systems
• Government meeting rooms and hearing chambers

Technical Specifications

Frequently Asked Questions

How does the PEMA 4250.70 differ from the PEMA 8250.70?

The PEMA 4250.70 provides 4 amplifier output channels, while the PEMA 8250.70 provides 8 channels. Both are 250W per channel 70V amplifiers with the same Protea DSP engine and 8-in x 8-out matrix. The 4250.70 is suited for installations requiring up to 4 audio zones.

Is a Dante or CobraNet card pre-installed in the PEMA 4250.70?

The base PEMA 4250.70 does not include a network audio option card. Dante and CobraNet option cards are available separately.

Does the PEMA 4250.70 require an external DSP processor?

No. The integrated 32-bit SHARC Protea DSP provides complete signal processing on all inputs and outputs, including FIR filtering, EQ, dynamics, crossover, and delay.

What is the total output power of the PEMA 4250.70?

The PEMA 4250.70 provides 1000W total RMS output: 4 channels at 250W each into 70V constant-voltage speaker loads.

Can the PEMA 4250.70 handle microphone paging?

Yes. Eight built-in microphone preamps with 15V phantom power, a gain-sharing automatic mic mixer, and an automatic feedback suppressor make the PEMA 4250.70 well suited for paging and announcement applications in commercial facilities.