DP28+ 2-Input 8-Output Professional DSP Loudspeaker Management Processor
Product Overview
The Haozhiseng Audio DP28+ is a professional 2-input, 8-output digital loudspeaker management processor designed for live sound, touring systems, rental applications, houses of worship, entertainment venues and fixed audio installations.
Equipped with 96 kHz sampling, 24-bit A/D and D/A converters, and a 32-bit DSP processor, the DP28+ provides accurate signal processing, low distortion and excellent channel separation.
Each input and output channel offers comprehensive processing functions, including parametric EQ, gain, delay, polarity, compressor and mute control. Eight independently configurable outputs also provide flexible signal routing, crossover filters and limiters for precise multi-way loudspeaker system management.
System configuration and monitoring are available through USB, RS-485 and TCP/IP connections.
Key Features
- 2 balanced XLR inputs
- 8 balanced XLR outputs
- 96 kHz sampling rate
- 24-bit A/D and D/A converters
- 32-bit DSP processing
- Six-band parametric EQ
- PEQ, low-shelf, high-shelf and all-pass filters
- Independent input and output gain
- Delay adjustment from 0 to 1,000 ms
- Adjustable crossover, compressor and limiter
- Flexible input-to-output routing
- Independent polarity and mute control
- Front-panel USB connection
- Rear-panel RS-485 and TCP/IP control
- 2 × 24-character blue-backlit LCD
- Five-segment LED input and output level indicators
- Universal AC 90–240 V power supply
- Compact 1U rack-mount design
Input Processing
Each input channel provides:
- Independent mute control
- Adjustable gain
- Delay from 0 to 1,000 ms
- Normal or reversed polarity
- Six-band parametric EQ
- PEQ, low-shelf and high-shelf filters
- First-order and second-order all-pass filters
- Two dynamic EQ filters
- Compressor
- Automatic gain control
Output Processing
Each output channel provides:
- Independent mute control
- Flexible input routing and mixing
- Adjustable gain
- Delay from 0 to 1,000 ms
- Normal or reversed polarity
- Six-band parametric EQ
- High-pass and low-pass crossover filters
- Linkwitz-Riley, Bessel and Butterworth filters
- Adjustable limiter
- Compressor
Crossover Filter Options
- Bessel and Butterworth slopes: 12, 18, 24, 30, 36, 42 or 48 dB/octave
- Linkwitz-Riley slopes: 12, 24, 36 or 48 dB/octave
- Adjustable frequency range: 19.7 Hz–20 kHz
Technical Specifications
| Item | Specification |
|---|---|
| Model | DP28+ |
| Product Type | Professional DSP Loudspeaker Management Processor |
| Input Channels | 2 |
| Input Connectors | 2 × Balanced Female XLR |
| Output Channels | 8 |
| Output Connectors | 8 × Balanced Male XLR |
| Input Impedance | 23 kΩ balanced |
| Output Impedance | 150 Ω balanced |
| PC Control Interfaces | Front USB, rear RS-485 and TCP/IP |
| RS-485 Connector | Phoenix terminal |
| TCP/IP Connector | RJ45 |
| Sampling Rate | 96 kHz |
| DSP Processor | 32-bit |
| A/D and D/A Converters | 24-bit |
| Frequency Response | 19.7 Hz–20 kHz, ±0.49 dB |
| Common-Mode Rejection Ratio | >40 dB at 0 dBu, 1 kHz |
| Maximum Input Level | +17.3 dBu at 1 kHz |
| Signal-to-Noise Ratio | >106 dB at +17.3 dBu, 1 kHz |
| Total Harmonic Distortion | <0.007% at 0 dBu, 1 kHz |
| Channel Separation | >100 dB at 0 dBu, 1 kHz |
| Input Gain Range | −80 to +12 dBu, 0.1 dB steps |
| Output Gain Range | −80 to +12 dBu, 0.1 dB steps |
| Input/Output Delay | 0–1,000 ms |
| EQ Gain Range | −20 to +20 dB |
| EQ Frequency Range | 19.7 Hz–20 kHz |
| EQ Bandwidth | 0.05–3 octaves |
| Display | 2 × 24-character blue-backlit LCD |
| Level Indicators | Five-segment LED input/output meters |
| Power Supply | AC 90–240 V, 50/60 Hz |
| Power Consumption | ≤25 W |
| Product Dimensions | 482 × 190 × 44 mm |
| Net Weight | 3.6 kg |
| Single-Unit Carton | 562 × 296 × 98 mm / 0.0163 m³ |
| Six-Unit Carton | 583 × 315 × 615 mm / 0.1129 m³ |
| Single-Unit Gross Weight | 4.5 kg |
| Six-Unit Gross Weight | 28.5 kg |
| Packing Quantity | 1 piece or 6 pieces per carton |
Applications
- Professional PA systems
- Live performances and concerts
- Touring sound systems
- Rental audio systems
- Multi-way loudspeaker systems
- Clubs and entertainment venues
- Houses of worship
- Conference halls and theatres
- Multi-zone sound systems
- Fixed audio installations
Why Choose the DP28+?
The DP28+ combines professional 96 kHz DSP processing, flexible 2-input/8-output routing and comprehensive loudspeaker management functions in a compact 1U rack-mount unit.
Its USB, RS-485 and TCP/IP control options make system configuration convenient, while its independent output processing provides the flexibility required for complex professional PA and multi-way loudspeaker systems.
