Gisen Audio DSP Series

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Overview

Function Description
Important Technical Specifications
Usage Features
Maintenance Features

This document describes the DSP series amplifier, a high-performance audio device designed for professional use.

Function Description

The DSP series amplifier utilizes a high-performance 32-bit floating-point DSP chip from TI, operating at a dominant frequency of 200MHz with a sampling frequency of 96KHz and 24-bit A/D and D/A converters. It features a 4-inch touch screen for easy operation and can be connected to a computer via USB or RS485 connectors. The RS485 connection allows for operation over distances up to 1500 meters and supports multiple amplifiers simultaneously. Each output channel is equipped with an 8-band EQ, X-over, delay, limiter, gain, and polarity adjustments, enabling precise control over the output signal. The amplifier employs high-efficiency, high-power, and high-density Class D amplification, complemented by comprehensive protection features against over current, overheat, and high-frequency issues to ensure safe operation.

Important Technical Specifications

Output Power (FTC: 20Hz-20KHz@0.03% THD):

DSP2.6 / DSP4.6:
- 8Ω per channel: 600W
- 4Ω per channel: 1200W
DSP2.9 / DSP4.9:
- 8Ω per channel: 900W
- 4Ω per channel: 1800W
DSP2.12 / DSP4.12:
- 8Ω per channel: 1250W
- 4Ω per channel: 2500W
DSP2.15 / DSP4.15:
- 8Ω per channel: 1500W
- 4Ω per channel: 3000W
DSP2.18 / DSP4.18:
- 8Ω per channel: 1800W
- 4Ω per channel: 3600W
DSP2.21 / DSP4.21:
- 8Ω per channel: 2100W
- 4Ω per channel: 4200W

THD: <0.03% Frequency Response: 20 Hz - 20 kHz, ±0.15 dB (-3 dB points: 5 Hz and 50 kHz) Damping Factor: > 400 @ 8Ω Hum & Noise: 102dB Input Sensitivity: 0.775V, 1V, 1.4V Input Impedance: 10 kΩ unbalanced, 20 kΩ balanced Connectors:

Input: 2 channels of XLR F & XLR M (for 2-channel models); 4 channels of XLR F (for 4-channel models)
Output: Speakon Cooling: Front-to-rear airflow, temperature-controlled fans Protections: Short circuit, open circuit, overheat, radio-frequency, ultrahigh or ultralow frequency protection Power Requirement: AC 220 V (±10%) 50-60 Hz Dimensions (mm): 88x483x425 Net Weight:
2CH: 11±0.2KG
4CH: 12±0.2KG Gross Weight:
2CH: 15±0.5KG
4CH: 16.5±0.5KG

Usage Features

Front Panel Controls:

Screen: Displays operational information.
Signal/Limiter Indicators: Green for signal, red for limiter.
MUTE/PROTECT Light: Indicates mute or protection status.
Power Light: Indicates power status.
USB Connector: For PC connection.
Control Knob: For navigation and adjustments.
Power Switch: To turn the unit on/off.

Rear Panel Connectors:

AC Power Cord: For power input.
Speakon Output Connectors: For speaker connections.
XLR Input Connectors: For audio input.
RS485 Internet Connector: For multi-amp networking.
XLR Linear Output Connector: For line-level audio output.

Touch-Screen Operation:

Main Page: Provides an overview of channel status (A, B, C, D) with quick access to X-over, Gain&Del, and Limit settings.
Save/Load Settings: Allows users to save up to 20 user-defined settings and load them as needed.
Settings Menu:
- Language: Choose between English and Chinese.
- Panel Lock: Offers "First Lock" (limits control to "Normal" page) and "Second Lock" (disables all controls) with password protection. A password reset requires factory service.
- Work Mode:
  - Stereo Mode: Each channel uses its own input signal.
  - Parallel Mode: All channels use channel A input signal.
  - Customize Mode: Allows each channel's output to use any channel's input signal.
- Screen Timeout: Configurable options for screen inactivity.
- RS485 Address: Set unique addresses for multiple amplifiers in a network (0-250).
- Data Recover: Restore factory settings.
Channel Link: Copy settings from a source channel to other channels.
EQ Operation: Adjust 8-band EQ parameters (Freq, Q, Gain, Type) for each channel.
Gain, Delay Operation: Adjust gain and delay for each channel.
Limiter Operation: Set threshold, attack, and release parameters for the limiter. The threshold values correspond to different power outputs (refer to the provided table).
Normal Menu: Adjust gain, mute, level, and temperature for each channel.

PC Software Operation:

System Requirement: Compatible with 32-bit or 64-bit Windows systems.
Connection: Connect via USB or RS485. The software supports up to 9 COM ports.
USB Connection:
1. Open the software and click the USB connection icon.
2. Select the COM port.
3. The software will display "PC Connecting..." upon successful connection.
RS485 Connection:
1. Use a USB-RS485 converter to connect the PC to the RS485 network.
2. Connect multiple amplifiers in series using network cables (A to 4, B to 5).
3. Set a unique RS485 address for each amplifier via the touch screen.
4. In the PC software, click the RS485 connection icon, choose the amplifier ID, and select the COM port.
Software Features:
- Export/Import Settings: Save current settings to a file and load previously saved settings.
- Save Settings: Save configurations to the amplifier's memory (up to 20 user settings).
- Load Settings: Load saved configurations from the amplifier's memory.
- Language Setting: Change software language (separate from panel language).
- Channel Copy: Copy settings from a source channel to a target channel.
- Channel Link: Link channels for synchronized control.
- Channel Sensitivity: Adjust input sensitivity (0.775V, 1.000V, 1.400V).
- Work Mode: Configure stereo, parallel, or customized input routing.
- Panel Lock: Control panel lock settings (Unlock, First Lock, Second Lock).

Maintenance Features

Safety Precautions:

Lightning Flash Symbol: Indicates dangerous voltage; avoid contact with uninsulated parts.
Exclamation Point Symbol: Refers to important operating and maintenance instructions in the manual.
Output Terminal Warning: Do not touch output terminals when the amplifier is powered on. Make all connections with the amplifier turned off.
Cover Removal: Do not remove the cover; no user-serviceable parts inside. Refer servicing to qualified personnel.
Moisture Warning: Do not expose the equipment to rain or moisture. Avoid placing water containers on the amplifier.
Hot-Plugging: Do not hot-plug input signals; only plug in or out when the power is off.
Load Impedance: Do not use the DSP amplifier under 3 ohms load.

LED Indicators:

POWER (green): On during normal operation, with a 7-9 second delay after power-on.
MUTE (red): On during mute or protection. Flashes faster during high temperature, fans run faster.
SIG (green): Indicates signal presence.
VPL (green/red): Flashes when the amplifier is at its highest output, indicating VPL is active to prevent overload. On during overheat protection.

Overheat Protection:

25-50°C: Fans run at low speed.
50-60°C: Fans increase speed from low to high.
75°C: Protection LEDs start to flash.
85°C: Protection splash quickly, CLIP LED illuminates, output controlled at 15 dB.
90°C: Overheat protection, protection LEDs flash at high speed, CLIP LED is fully bright, indicating extreme low load, no ventilation, or fan malfunction.

Password Management:

Be careful with panel lock passwords. If forgotten, the amplifier must be sent back to the factory for data flashing.

Serial Number:

Record the serial number, date of purchase, and purchased-from information from the rear panel for records and warranty purposes.