Ashly PEMA 4250.25 4-Channel Amplifier with Protea DSP and CNM-2 CobraNet Option Card

PEMA sets a new industry benchmark for value-engineered zone sound systems. By seamlessly merging our powerful, open-architecture DSP functionality paired amplifier performance inside a two-rack space unit, PEMA lowers overall system cost, occupies less space, improves energy efficiency, and both speeds and simplifies system installation and programming.

Four and eight amplifier channel versions are available at both 125 and 250 Watts per channel. Full 96kHz performance is available on 32-bit SHARC processors for utterly transparent audio.

PEMA changes the way consultants and integrators approach sound system design. With only the addition of input sources and output speakers, PEMA delivers an elegant solution with less cabling, less rack space, and less installation time, using proven DSP and amplifier technology that will awe clients with its simplicity, sophistication, and reliability.

In addition to DSP algorithms such as ambient noise compensation, advanced automatic feedback suppression, automatic mixer, and a full complement of filters, EQs, delays, and the like, PEMA offers DSP control of the amplifier functionality as well: selection of bridge-mode operation, HPF settings for constant voltage system networks, stereo-linking of channel pairs, MIC/LINE/TEL-PAGE functions on channel 1, full control of ducking priorities, and full-range remote-gain control capability.

PEMA’s I/O count and formats are ideal for small to mid-sized installations. Each variant has eight balanced input channels that are software selectable for mic or line levels.

The first channel may also be set for a transformer isolated, TEL-PBX level. Additionally there are eight pairs of summed-mono RCA connectors optimized for consumer line level devices. Eight preamp auxiliary outputs allow integrators to route signals from the matrix mixer to anywhere the system requires.

As a member of the respected Protea DSP lineage, PEMA is remarkably easy to program and deploy. All set up is accomplished using standard 10/100 Ethernet protocol and our Protea ne Software on a PC platform.

Hot-plug DSP placement allows users to insert any function into any channel block, even when running live audio. Automatic DHCP network IP configuration reduces network set up time. Lockable front panel controls and multi-level software security with password access guarantee a tamper-proof audio system.

Protea Digital Signal Processing for PEMA
Protea is compatible with Microsoft Windows 8, 7 (Vista/XP) 32 & 64 bit systems. Audio professionals find our Protea DSP to be very intuitive and easy to navigate-and you will too.

Ashly PEMA 4250 Features
CobraNet network audio fully supported
8-in x 8-out sophisticated matrix mixing
8 built-in mic pre’s
Gain sharing automatic microphone mixing (Automixer)
Automatic feedback suppression
Ambient noise compensation
Dedicated telephone/PBX input
Dual RCA and balanced euroblock inputs
Post DSP AUX line level outputs
Stereo summed to mono
Event scheduling (RTC)
Adjustable HP/LP filters
Built-in pink/white noise & sine wave generator
Full suite of Ashly Protea DSP
Hot-plug DSP placement
96kHz or 48kHz sample rate
32-Bit SHARC DSP
24-Bit A/D-D/A audio resolution
15V phantom power for mic inputs
Full control using Ashly software over 10/100 baseT Ethernet
Easy and intuitive user interface
Automatic DHCP network IP configuration
Euroblock connectors for preset recall, DC remote level control and serial data control
External control via Ashly standard wall remotes, Ashly Ethernet wall remotes or Ashly Remote iPad App
Level control via variable DC control voltage
Stand-By mode activation via contact closure
Multi-level Security
Safety/Compliance: TUV, CE, FCC, RoHS

Ashly PEMA 4250 Specifications
Channels
Channels
4
Power
Power Output
250W
Line Current Draw
Standby Mode
190mA
Idle (no signal)
540mA
Typical
2.85A (1/8 Max Power, Pink Noise, All Channels Driven)
Maximum
3.00A (1/3 Max Power, Sine Wave, All Channels Driven)
Thermal Dissipation
Standby Mode
46.7 BTU/hr
Idle (no signal)
123 BTU/hr
Typical
341 BTU/hr (1/8 Max power, pink noise, All Channels Driven)
Maximum
378 BTU/hr(1/3 Max power, sine Wave, All Channels Driven)
Signal to Noise
Signal to Noise
>105dB (20Hz-20kHz, Unweighted)
General
Input Sensitivity
6.2dBu
Voltage Gain
26dB
Damping Factor
>250 (8 Ohm load, <1kHz) Distortion <0.5% (SMPTE, typical) <0.5% (THD-N, typical, 8 Ohm, 10dB below rated power, 20Hz-20kHz) Channel Separation -80dB (dB from full output, 1kHz) Frequency Response 20Hz-20kHz, +/-1dB Mic/Line Input Impedance 4.8k Ohms Mic/Line Maximum Input Level +21dBu Mic/Line Preamp Gain 0, +20dB, +40dB, +60dB Mic/Line Phantom Power +15V, switchable Channel 1-4, 5-8 Summed Mono 3.16k Ohm (Input Impedance) +11dBu (Maximum Input Level) Channel 1 TEL-PBX 3.9k Ohm (Input Impedance) +21dBu (Maximum Input Level) Preamp Output Maximum Level +8dBu AUX Output Maximum Level +20dBu Rear Panel Controls Ethernet 10/100, Channel 1 TEL-PBX Switch, Remote Standby, Preset Recall (4), Remote Level (8), Remote Data Connectors (each channel) Input: Euroblock Output: Euroblock LED Indicators Unit Status Power: Switch: On, Off (Blue) Standby: Standby, flashing (Yellow) Protect: On, Off (Red) Disable: On, Off (Yellow) COM: On, for Ethernet data or Device ID (Green) Each Channel Signal level: Clip/Mute (Red); -6dB (Yellow) and -18dB, -12dB (Green) Bridge: Per Channel Pair (Green) Temp: Per Channel (Yellow) Current: Per Channel: Proportional to output (Green) Connections Audio Connections 1 Euro connector balanced input, selectable for Mic, Line or TEL-PBX 7 Euro connector balanced inputs, software selectable for Mic or Line 8 pairs of unbalanced, summed mono RCA connectors optimized for consumer line level (-10dBu) devices 8 Euro connector Preamp/Aux outputs 4 or 8 Euro connector speaker outputs CobraNet Digital I/O options Power Requirement AC Mains 120VAC or 240VAC, +/-10% 50-60Hz Power Cable Connector 15A Edison, 3-Prong IEC Environmental Environmental 40 to 120 degree F (4 to 49 degree C) noncondensing DSP: Input Source Selection Input Source Selection Options Analog, Auto (Net, AES3, Analog) DSP: Brick Wall Limiter Threshold -20dBu to +20dBu Ratio infinity Attack 0.2ms/dB to 50 ms/dB Release 5ms/dB to 1000ms/dB DSP: Compressor Threshold -20dBu to +20dBu Ratio 1.2:1 to infinity Attack 0.2 to 50ms Release 5ms/dB to 1000ms/dB Detector Peak/Average Attenuation Bus 2 available Metering In, Out, Attenuation, Graphical DSP: Autoleveler Controls Target Level -40dBu to +20dBu Action Gentle, normal, aggressive, user-defined Maximum Gain 0dB to +22dB Metering Input Level, Gain, Attenuation Ratio 1.2:1 to 10:1 Threshold Below Target -30dB to 0dB Gain Increase/Decrease Rate 5ms/dB to 1000ms/dB Hold Time 0-6 sec DSP: Ambient Noise Compensation (Output) Max Gain -20dB to +20dB Min/Base Gain -40dB to -1dB Gain Change Rate 0.2s/dB to 20s/dB Link Group 16 available ANC Input Channel 1-4 or 1-8 Noise Threshold -40dBu to +20dBu Program/Ambient Gain Ratio 0.3:1 to 3:1 Metering Input level, Attenuation, Average noise DSP: Ducking Trigger Threshold -80dBu to +20 dBu Ducking Release 5ms/dB to 1000ms/dB Ducking Depth 0dB to -30dB, infinity Enable Ducking at Matrix Mixer Yes Metering Input DSP: Gate Threshold -80dBu to +20dBu Range off, 100dB to 0dB Attack 0.2ms/dB to 50 ms/dB Release 5ms/dB to 1000ms/dB Metering Key Signal, Gate LED, Graphical DSP: Advanced Gate Controls Key Engage Enable Yes Key Frequency 20Hz to 20kHz Key Bandwidth 0.016 to 3.995 Octave DSP: Gain Gain (with/without VCA) -50dB to +12dB, off, polarity invert Digital VCA Groups 4 available Remote RD8C Gain Enable per channel, 0dB to infinity WR-5 (neWR-5) Remote Gain 0 to -50dB, Mute DSP: EQ (31-Band) Filter Type Constant Q or Proportional Bandwidth 0.499oct to 0.25oct DSP: EQ (Parametric 2,4,6, or 10 Band) Frequency 20-20kHz Level -30dB to +15dB Q Value 0.016 to 3.995 Octave DSP: EQ (Hi/Low Shelf 6/12 dB/oct) Frequency 20Hz-20kHz Level -15dB to +15dB DSP: EQ (All Pass) Frequency 20Hz-20kHz DSP: EQ (Variable Q HP/LP) Frequency 20Hz-20kHz Q Value 3.047 to 0.267 DSP: EQ (Notch/Bandpass) Frequency 20Hz-20kHz Q Value 92.436 to 0.267 DSP: Feedback Suppressor (Input Only) Filters 12 In/Out per filter Yes Lock per filter and global lock Yes Filter Modes Float, Restricted, Manual Filter Type Notch, Parametric Filter Frequency Range 20Hz to 20kHz Notch Filter Infinity Parametric Filter +15dB to -30dB Filter Bandwidth 0.016 to 3.995 Octave Detector Sensitivity 5 levels Float Time 5 min to 24 hours DSP: Crossover (2 /3/4 Way Crossover) Bessel & Butterworth Filters 12/18/24/48 dB/oct Linkwitz-Riley Filter 12/24/48 dB/oct Frequency Off, 20Hz-20KHz DSP: Delay (@ 48kHz Sampling Rate) Speaker Delay 0-21ms Delay 0-682ms DSP: Delay (@ 96kHz Sampling Rate) Speaker Delay 0-10.6ms Delay 0-341ms DSP: Audio Metering Tool Range -60dBu to +20dBu Increments 1dB Peak Hold Indicator Yes DSP: Signal Generator Tool Signal Level Off, -50dBu to +20dBu Sine Wave Frequency 20Hz-12kHz DSP: Matrix Mixer Gain (0.5dB increments) Off, -50dB to +12dB Mute Per channel Auto-Mixer Enabled Per channel Global Auto-mixer Response 0.01sec to 2sec Enable Ducking at Mixer Yes Ducking LED Per channel if enabled Metering Level, auto-mixer level DSP: Processors Input A/D, Output D/A 24 bit DSP Processors 32-bit floating point Sample Rates 48kHz, 96kHz Propagation Delay @ 48kHz: 1.42ms Propagation Delay @ 96kHz: 0.71ms Physical Dimensions (W x H x D) 19 x 3.5 x 15.5" (483 x 89 x 394mm) Weight 18.5 lb (8.4kg)