FBT DLM 480 - 4-Input/8-Output Digital Loudspeaker Management Processor with RMS/Peak Limiter and LCD Display in Black Finish

The FBT DLM 480 is a highly capable DSP-based digital loudspeaker management processor, designed to offer flexible routing and comprehensive signal processing for live events and fixed installations. With 4 inputs and 8 outputs, the DLM 480 provides extensive customization options in a compact 1U unit. It seamlessly integrates multiple audio processing features into a single device, simplifying complex audio system setups. The processor offers matrix routing, allowing full assignability of inputs to any output, providing total control over audio distribution across multiple zones or speaker arrays. This powerful tool is equipped with advanced equalization, delay, and crossover capabilities, ideal for both professional installations and live performances.

Offering robust input and output equalization, the DLM 480 includes 31 IIR EQ options per input and up to 8 IIR EQ options per output. It also supports FIR filters, allowing users to choose from a wide variety of crossover types, including IIR from 6 to 48dB/oct, FIR, and Linear Phase filters with constant group delay. The processor's RMS and peak limiters ensure that your speakers are protected from potential damage due to excessive power. Additionally, the device features dynamic loudness filters, noise gates, and parametric EQs to tailor the sound to the exact specifications of the environment. With real-time system response measurement using a PC and sound card, the DLM 480 guarantees optimal performance and sound accuracy.

The DLM 480 is also equipped with intuitive front panel controls and an LCD display, allowing for quick adjustments and monitoring. It supports remote control through PC connectivity via USB, and larger systems can connect through Ethernet or RS 485 networks for centralized control of multiple processors. The unit's versatility is further enhanced by its ability to store up to 32 user presets, making it easy to recall configurations for different setups or system changes. Whether you are managing a multi-zone sound system, integrating different speaker types, or fine-tuning sound for a live event, the FBT DLM 480 provides all the tools necessary to deliver professional-quality audio.

Features

• 4 inputs and 8 outputs for flexible signal routing and system configuration
• Comprehensive DSP processing including IIR, FIR, and Linear Phase crossovers, EQ, delay, and noise gates
• RMS and peak limiters to protect speakers from excessive power
• Matrix routing with fully assignable input-output paths for precise audio control
• Supports up to 31 IIR EQ for inputs and 8 IIR EQ for outputs with customizable filter types
• FIR crossover filters with a wide range of slope options (up to 120dB per octave)
• Dynamic loudness filter and advanced noise gate for optimizing audio performance in varying environments
• Real-time frequency and phase response measurement via PC and sound card for accurate tuning
• 32 user presets to store configurations, plus backup options for more settings
• One-press mute buttons for quick muting of all inputs and outputs
• Front panel control with LCD display for intuitive setup and monitoring
• Networking options via Ethernet or RS 485 for large systems
• USB port for PC connection and easy system control
• Signal generator for white/pink noise to assist with system calibration
• Customizable user modes with password protection for secure access
• Dimensions: 19 x 9.1 x 1.75 inches, weight: 6.6 lbs for easy rack mounting
• Operating voltage range: 90 - 240V AC, 50-60Hz for global compatibility
• High signal-to-noise ratio of >116dB (A-weighted) for clear, high-quality audio
• Temperature-controlled cooling for consistent performance under demanding conditions
• THD < 0.003% for minimal distortion across a wide frequency range (20Hz-20kHz)

Specifications

General

• Input Impedance: 20K Ohm balanced
• Output Impedance: 100 Ohm
• Max. Input Level: +20dBu
• Max. Output Level: +18dBu
• Crosstalk: < -95dB
• Sample Rate: 48kHz
• Signal to Noise Ratio: > 116dB (A weighted)
• Noise Floor: < -95dB (A weighted)
• Common Mode Rejection Ratio: 60dB
• Frequency Response: 20Hz - 20kHz +0.3dB
• THD (+4dBu 1kHz): < 0.003%
• Mains Voltage Range: 90 - 240Vac / 50-60Hz
• Nominal Power Consumption: 30W

Connectors

• Audio Input: 4 x 3 pin female XLR
• Audio Output: 8 x 3 pin male XLR
• Ethernet: 1 x Shielded RJ45, Dynamic or Static IP
• RS485: 2 x RJ45
• USB: 1 x USB Type-B
• Mains: 3 pin IEC

Processing

• Signal Generator: White/Pink noise - Level range: -30dBu +10dBu
• Input & Output Gain: -18dB +12dB, step 0.1dB
• Noise Gate:
  • Threshold: -80dBu -45dBu
  • Attack time: 1ms 1000ms
  • Release time: 1ms 1000ms
• Dynamic Loudness Filter:
  • Gain Range: 0dB -10dB
  • Attack Speed: fast/medium/slow
• Parametric EQ:
  • Input channels up to 31 optional types of EQ
  • Output channels up to 8 optional types of EQ
• Optional Filter Types:
  • Bell classic and constant Q filter
  • 1st order high Shelf filter
  • 2nd order high Shelf filter
  • Variable Q high Shelf filter
  • 1st order low Shelf filter
  • 2nd order low Shelf filter
  • Variable Q low Shelf filter
  • 1st order low-pass filter
  • 2nd order low-pass filter
  • Variable Q low-pass filter
  • 1st order high-pass filter
  • 2nd order high-pass filter
  • Variable Q high-pass filter
  • Band pass filter
  • Notch filter
  • 1st order all-pass filter
  • 2nd order all-pass filter with variable Q value
• Center Frequency: Adjustable within the frequency range of 20Hz-20kHz with a step accuracy of 1Hz
• Q Value/Bandwidth: The Q value range of Bell filter is 0.4 - 128, the step is 0.01, the range of the Q value of the Chevron/highpass/lowpass filter is 0.1 - 5.1 and the step is 0.01, the value range of bandpass /notch filter Q is 4 - 104 and step is 1
• EQ Gain Range: -15dB +15dB
• IIR Crossover Filter:
  • Butterworth slope: 6/12/18/24/36/48dB per octave
  • Bessel slope: 12/24dB per octave
  • Linkwitz-Riley slope: 12/24/36/48dB per octave
• Linear Phase Filter: Linkwitz-Riley: 24/48dB per octave
• FIR Crossover Filter:
  • Type: high pass/low pass/band pass/external import
  • Taps Range: 256 - 512
  • Slope Range: 21 - 120dB per octave Time
  • Window Type: Rect/Sinc/Keiser/Hanning/Hamming/Blackman/Blackman-Harris/Blackman-Nuttal/Nuttal/Keiser-Bessel/Sine
• RMS Compressor:
  • Starting Threshold Range: -10dBu +20dBu
  • Compression Ratio Range: 2 32:1
  • Soft and Hard Knee: 0 - 100%
  • Attack Time: 0.1ms - 1000ms
  • Release Time: 10ms - 15000ms
  • Gain Compensation: Max 12dB
• Peak Limiter:
  • Threshold Range: -10dBu +20dBu
  • Attack Time: 1ms - 1000ms
  • Release Time: 10ms - 3000ms
• Delay: The adjustable delay time of each input channel + output channel is 452ms, step accuracy 0.0104ms
• FIR Filter: Each input channel and output channel can import FIR filter with 48kHz sampling rate and 512 taps

Physical

• Dimensions: 19 x 9.1 x 1.75 inches
• Weight: 6.6 lbs