DSP Processor
ADI ADSP-21571 dual-core SHARC+, Arm Cortex-A5 floating-point core, 64-bit floating-point optimized FIR/IIR algorithms
Product Overview
The Harmonai GLD-336 Digital Audio Processor is a high-performance digital DSP processor supporting multi-channel analog signal routing. Users can connect to a PC via USB or RJ45 Ethernet for real-time upper-level software control. The CPU uses the ADI ADSP-21571 digital audio processing chip — a dual-core SHARC+ DSP built on the Arm Cortex-A5 high-performance floating-point architecture, supporting optimized 64-bit floating-point FIR and IIR algorithms. The A/D section employs the AK5552 analog-to-digital converter, while D/A decoding uses the Cirrus Logic CS4398 chip, achieving a professional-grade 118dB signal-to-noise ratio (SNR) and >120dB dynamic range — fully meeting mainstream audio source playback requirements. The unit features a 4.58" ultra-HD LCD display with bilingual Chinese/English UI for intuitive human-machine interaction.
A/D Converter
AK5552, supports 32-bit/768kHz sampling rate, differential filtering input design, professional-grade 118dB SNR
D/A Converter
Cirrus Logic CS4398, supports 192kHz/24-bit, >120dB SNR, ultra-low THD+N
Input Channels
4ch analog XLR balanced
Output Channels
8ch analog XLR balanced
Input Channel Equalizer
5-band DEQ + 31-band GEQ + 15-band PEQ per channel
Output Channel Equalizer
15-band PEQ per channel, supports PEQ/High-shelf/Low-shelf/AP1/AP2 types
Input Limiter
Threshold: -35dB to +20dB; Attack: 2ms–500ms; Release: 8ms–2000ms; Ratio: 1:1 to 10:1
Output Limiter
Threshold: -50dB to +20dB; Attack: 2ms–500ms; Release: 8ms–2000ms; Ratio: 1:1 to ∞:1; Hard/Medium/Soft knee modes
Input Noise Gate
Threshold: -135dB to -39dB; Attack: 2ms–500ms; Hold: 2ms–500ms; Release: 8ms–2000ms
FIR Filter
512-tap, cutoff frequency 20Hz–20kHz, supports txt/csv file import, six window functions selectable
Input/Output Gain
-80dB to +12dB
Input/Output Delay
0 to 680ms
High-Pass/Low-Pass Filters
Butterworth/Bessel/Linkwitz-Riley slopes, selectable slopes: 12/18/24/30/36/42/48 dB/Oct
Custom Presets
32 user presets, 30 factory presets built-in
Display & Operation
4.58" ultra-HD LCD display, Chinese/English UI, RJ45 Ethernet (UDP protocol), USB connection
Frequency Response
20Hz–20kHz @ +4dBu: +0/−0.3dB
Total Harmonic Distortion (THD)
<0.003% (20Hz–20kHz @ +4dBu)
Signal-to-Noise Ratio (SNR)
113dB A-weighted
Residual Noise
< −90dBu
Dynamic Range
>122dB (20Hz–20kHz, 0dB)
Maximum Gain
48dB (input to output)
Maximum Delay
1360ms (input to output)
Channel Separation
>80dB @ 1kHz
Common-Mode Rejection Ratio (CMRR)
>100dB @ +20dBu, 60Hz
Input Impedance
Balanced: 20kΩ / Unbalanced: 10kΩ
Output Impedance
Balanced: 100Ω / Unbalanced: 50Ω
Typical Applications
The Harmonai GLD-336 digital audio processor is ideal for professional sound systems, live sound reinforcement, conference systems, KTV venues, bar entertainment, and multi-function halls. With 30 built-in factory presets for rapid deployment across diverse scenarios — plus PC software signal generator functionality for convenient on-site speaker tuning and calibration — it’s the preferred choice for audio engineers and system integrators.
Explore the full Harmonai professional audio product line — contact us today for detailed solutions and quotations.
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