Bosch PLENA matrix PLM-4P220 Power amplifier, 4x220W

• 4‑channel, Class D power amplifier
• 100V/70V/8Ω/4Ω outputs
• Complete loudspeaker processing DSP with input mixing; controlled by PC GUI and iOS app
• Amp Link to connect easily with PLM-8M8
• Environmentally friendly auto standby mode

The PLM‑4Px2x PLENA matrix Amplifiers are built to perform. Designed to be reliable, cost effective, multi channel amplifiers; they are suitable for almost any application that demands high quality audio and flexible control.
The built‑in DSP processor is packed with powerful features. The loudspeaker library will allow the easy tuning of Bosch/EV/Dynacord loudspeaker products. The power saving mode on the amplifier allows the amplifier to save over 80% of its running costs when areas are not being used. Equipped with “Amp Link”, combining both the PLM‑4Px2x amplifiers with the PLM‑8M8 8 Channel DSP Matrix Mixer couldn’t be easier. Some typical application include: Shopping centers, schools, restaurants, bars, nightclubs, cafes, gyms, recreational facilities, churches, warehouses, office buildings, regional airports, train stations, bus terminals, boardrooms, meeting rooms, conference facilities, small theme parks, museums, back of house performing arts centers and sports stadia.

Functions
Controls and indicators
The indicators on the front panel are; Signal/Clip, fault per channel and mains power. There are no controls on the front of the unit; this is to reduce the assistance from “overly helpful” venue staff. However, on the rear of the unit there is attenuation for the 4 output channels, dip switches for changing the input sensitivity, bridging the amplifier channels; and the mains power switch. All other controls and indicators are available via the PC GUI software.

DSP features
The DSP features are accessed via the PC GUI software.

• Input Mixer: Each of the 4 amplifier channels has an separate input mixer. Via the PC GUI it is possible to mix any of the 4 line inputs and have level control over the override input and noise generator. Effectively creating a very powerful stand‑alone mixer amplifier.
• Cross over: Provides HPF, LPF up to the 8th order for each channel.
• Output EQ: Every zone has a 8‑band fully functional parametric EQ. It also contains the dynamic bass
  enhancement feature.
• Delay: Output delay for 120ms per channel.
• DRC (Dynamic Range Compressor): Threshold, ratio, attack, release, and gain per channel.
• Output level: Ability to limit an amplifier channels output.
• Output Level mixer: Each amplifier output is separately controlled on the one screen making it easy to adjust and operate.
• Fault and thermal indication per amplifier channel.
• Channel mute and system mute.
• Manual standby.
• Control via PC GUI and/or iOS control app. Third party control software can be used to control the output level mixer and standby modes over ethernet.

Dynamic Bass Enhancement
An area that is tuned well and sounds good at normal levels can sound thin when the volume is turned down. The Dynamic Bass Enhancement automatically gives a more full sound even at low SPL. When the zone is restored to the normal level the bass enhancement decreases proportionally to the restore the preset
level and tuning.

Standby and auto standby mode
The standby mode reduces the environmental impacts and the running costs of owning power amplifiers, making it much more cost effective and environmentally friendly than other amplifiers. Standby can be engaged and disengaged manually via the PC GUI software, or with the addition of a Bosch motion detector it can become an “auto standby mode”. In zone(s) where activity has stopped the amplifier will automatically shift to a low power
consumption mode after a pre determined time. When the area does become active again the amplifier simply restores to being fully active in under a second by ramping the background music back in smoothly. The amplifier also comes equipped with a 12 VDC power output, to make installation of motion detectors
simple and easy.