Chapter 1 Introduction
DSP 4.8 is a 4in8out FIR DSP speaker processor, integrated with high performance DSP process, Dynamic EQ, FIR automatic linear phase and other powerful function. This speaker processor supports a variety of input signal: Analog\AES3\Dante network audio. Standard FIR designer in DSP 4.8 provide automatic linear magnitude and phase function, user can take an easy way to set their speakers parameters.
With RJ45\USB and RS232 connectors, PC software DSP 4.8 provides user a easy way to control multiple devices. RS232 connectors support device being controlled from third-party system.
Applications
- Party room
- Live show
- Outdoor activities
- Sports stadium
Features
- 4 analog inputs and 8 analog outputs.
- Each input support to switch AES3 signal.
- 4 channels Dante network audio optional.
- High performance DSP process, 96k24bit sampling rate.
- Input with 15 bands PEQ, output with 10 bands PEQ.
- Support HPF and LPF with Butterworth\Bessel\Linkwitz-Riley. Support LSLV and HSLV. Support ALL-PASS, Band pass, Band stop filters, Phase, Notch filter, 3 kinds of High pass and Low pass.
- Input with 3 bands Dynamic EQ.
- Input with 4 x 512Taps 48k FIR linear phase setting.
- Output with 4 x 512Taps 48k FIR linear phase setting.
- Standard FIR automatic linear phase function designer.
- Support presets archiving and locking, hide setting parameters.
- Control connections: USB or TCP/IP. Configured with RS232 central control connection.
- Nice GUI windows7/8/10/11 software .
- Colourful LED indicator for input and output signal.
- High analytical power, wide dynamic audio performance, suitable for stage, bar and other high-end sound systems.
Chapter 2 Technical parameters
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DSP 4.8
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1. DSP Process
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Process:
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ADI SHARC 21489 450MHz
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System delay:
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2.1ms
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AD/DA:
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24-bit 96KHz
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2. Analog Audio Inputs and Outputs
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Input:
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4 channels balanced.
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Input interface:
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XLR(Neutrik®)
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Input impedance:
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20KΩ
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Max input level:
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20dBu/Line
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Dante in/out
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4*4 channels optional
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Output:
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8 channels balanced. Line level
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Output interface:
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XLR(Neutrik®)
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Output impedance:
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50Ω
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3. Audio Performance Specifications
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Frequency response:
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20Hz-20kHz(+-0.5dB)/Line
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THD+N:
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-93dB(@0dBu,1kHz,A-wt)/Line
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Ground noise:
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20Hz-20kHz, A-wt, -93dBu
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SNR:
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113dB(@16dBu,1kHz,A-wt)/Line
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4. Connect Ports and Indicators
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USB:
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Type A-B, free driver
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RS232:
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Serial port communication
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TCP/IP interface:
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RJ-45
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Indicator light:
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Clip, level, edit, mute
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5. Electrical and Physical
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Supply:
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AC100V～240V 50/60 Hz
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Products Dimensions
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483mmx265mmx44.5mm
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Packaged Dimensions
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537mmx343mmx77mm
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Net Weight
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3.8kg
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Packaged Weight
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4.2kg
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Operating temperature:
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-20℃～80℃
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Chapter 3 Functions structure and panel operation
Dimension (mm)
Operating front panel
①Press MENU, it will show menu list, using NEXT or BACK to select functions: GLOBAL MEMORY, INPUT SECTION, MATRIX, SYSTEM, press QUIT to exit.
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Functions in panel
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Menu list
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Remark
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1.GLOBAL MEMORY
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RECALL a Memory
STORY a Memory
DELETE a Memory
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2.INPUT SECTION
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A ANALOG (DANTE)
B ANALOG (DANTE)
C ANALOG (DANTE)
D ANALOG (DANTE)
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When Dante version would be available.
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3.MATRIX
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Routing Out.1=Input A*....
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Long press such output channel button under LED to change.
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4.SYSTEM
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1 IP SET
2 RENAME
3 DSP VERSION
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②Press BYPASS, it will quickly show RECALL a Memory function, using NEXT or BACK to select presets and then press ENTER to enable one of presets.
Operation of buttons on front panel - Input & Output Channels
①When user need to quickly mute input or output channel, shortly press button under the LED of such channel, the light will turn red.
②When user need to set parameter of input or output channel, long press button under the LED of such channel, the light will turn blue.
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Functions - Input channels
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Buttons for setting
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Attention setting
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IPX Input X Gain
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GAIN
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IPX Input X Polar
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GAIN (+ -)
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IPX Input X PEQ:1...15
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FREQ, Q, GAIN, ENTER
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BYPASS (PEQ -)
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IPX Input X HPF
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FREQ, Q
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BYPASS (- HPF)
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IPX Input X LPF
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FREQ, Q
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BYPASS (- LPF)
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IPX Input X Delay
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GAIN
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BYPASS (BYPASS -)
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IPX Input X Noise Gate
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FREQ
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BYPASS (OFF ON)
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IPX Input X Noise Gate
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Q, GAIN
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BYPASS (OFF ON)
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IPX Input X DEQ:1...3
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FREQ, GAIN
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BYPASS (PEQ BPS)
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IPX Input X DEQ:1...3
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Q, GAIN
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BYPASS (PEQ BPS)
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IPX Input X DEQ:1...3
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Q, GAIN
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BYPASS (PEQ BPS)
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IPX Input X DEQ:1...3
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Q, GAIN
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BYPASS (PEQ BPS)
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IPX Input X Fir
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BYPASS
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Functions - Output channels
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Buttons for setting
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Attention setting
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OPX Output X Gain
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GAIN
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OPX Output X Polar
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GAIN
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OPX Output X PEQ:1...15
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FREQ, Q, GAIN, ENTER
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BYPASS (PEQ -)
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OPX Output X HPF
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FREQ, Q
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BYPASS (- HPF)
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OPX Output X LPF
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FREQ, Q
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BYPASS (- LPF)
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OPX Output X Delay
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GAIN
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BYPASS (BYPASS -)
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OPX Output X Compress
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FREQ, Q, GAIN
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BYPASS (OFF ON)
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OPX Output X Compress
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Q, GAIN
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BYPASS (OFF ON)
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OPX Output X Limiter
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Q, GAIN
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BYPASS (OFF ON)
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OPX Output X Limiter
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GAIN
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BYPASS (OFF ON)
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OPX Output X Fir
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BYPASS
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Remark: X” means the No. of such channel user has selected. If find no effect after setting parameter, please check whether select BYPASS or not.
③When user need to link channels and then set their parameter, long press button under the LED of each channel, the light will turn blue. LCD will display “IPX+” or “OPX+”, means the second channel or other channels will be set same with first channel.
When user need to quickly mute channels in link setting, shortly press button under the LED of one of channels, all the lights will turn pink.
Chapter 4 Operation of control software - DSP 4.8.exe
DSP 4.8 provides user with a fast interaction to control one or more devices through multiple methods: TCP/IP, USB, common serial port (RS232). Easily set DSP functions of device and check central control codes.The configuration parameter can be stored in presets, convenient for various applications.
4.1 Operating condition
DSP 4.8.exe is suitable for Win7/8/10/11 x86/x64 PC system with Microsoft .NET Framework 4.0. When connecting device in USB method, the device will automatically ejects the storage disk, user can unzip software in Windows, no need to setup.
Double click DSP 4.8.exe, the main interface will pop up.
4.2 Connections setting
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If connect device by using network cable, click Setting in Device List, choose TCP in Connection windows.
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If connect device by using USB A-B, click Setting in Device List, choose USB in Connection windows.
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If connect device by using network cable, click Setting in Device List, choose COM in Connection windows. Please check port and baud rate carefully for 232 or 485 before setting.
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The software will scan device the method set in last time, to check if device is connected. If successfully connected, devices will be shown in device list.
User can mute device, refresh connecting, or delete device in this window. Single click device, to load function interface.
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When using TCP control, there is a situation that only one point is displayed after scanning, but can not connect device. In this case, user need to change the IP address of the device to the same network segment as the PC computer.
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Right-click the device enclosure, a Net Setting window will show.
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Set IP address of device refer to IP showed in the bottom of the software. Set the first three paragraphs same with the PC IP.
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Successfully scanned and connected.
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User can link multiple same devices in group by clicking Link button, and then set group device, group name and main device, link mode and parameter according to needs.
4.3 DSP functions setting
Double-click HOME icon to open all functional interfaces, or double-click a function icon separately to open the corresponding interface. When multiple function windows opened, users can drag the window to switch function Settings.
4.3.1 DSP functions setting - INPUT
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- Set Phase of input;
- Set Mute of input;
- Select Analog\AES3\Dante input signal;
- When choosing test signal, user can select Sine/Pink Noise/White Noise for each input channel.
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4.3.2 DSP functions setting - NOISE GATE
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- Attack: 1 to 2895ms;
- Release: 1 to 2895ms;
- Threshold: -90 to 0dBu;
- Click
 to enable this function.
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4.3.3 DSP functions setting - PEQ-X (input and output)
High pass filter
enter value of frequency and select type, press 
to enable this function:
Butterworth 6/12/18/24/36/48, Bessel 12/24/36/48, Linkwitz-Riley 12/24/36/48.
Low pass filter
enter value of frequency and select type, press 
to enable this function:
Butterworth 6/12/18/24/36/48, Bessel 12/24/36/48, Linkwitz-Riley 12/24/36/48.
PEQ 15 bands for input channel
Type: PEQ/LSLV/HSLV/ALLPASS-1/ALLPASS-2/3 kinds of high/low pass,Phase, Band pass,Band stop,Notch filter;
Freq(Hz) Q Gain(dB): input value or use mouse pulley to set value;
Users can also drag the frequency dot on the curve to adjust.
PEQ 10 bands for output channel
Type: PEQ/LSLV/HSLV/ALLPASS-1/ALLPASS-2/3 kinds of high/low pass,Phase, Band pass,Band stop,Notch filter;
Freq(Hz) Q Gain(dB): input value or use mouse pulley to set value;
Users can also drag the frequency dot on the curve to adjust.
Phase curve: display the phase curve of the current channel.
View: show or hide all balance control points.
Bypass: turn on or off all equalizer EQ of the current channel at the same time
Preset: save all the setting parameter of the equalizer of the current channel to the computer, and recall the channel equalizer parameter of the computer, which can be called across channels and devices.
Copy: copy the current channel equalizer parameter value, which can be pasted to other similar channels (such as input channel parameter can only be copied to other input channels).
Paste: used in combination with the copy button to paste the last copied equalizer parameter value to the current channel.
Reset: reset the equalizer parameter to the default parameter values.
As shown in the figure above, the left side 
is the interface switching button for each channel. Click to switch the EQ channel, and the color is the currently selected channel. 
is the curve color of the EQ channel. 
For each channel's EQ curve display switch, check it to enable it to display the curves of other channels in the current channel interface.
4.3.4 DSP functions setting - DYNAMIC EQ
- Mode: Boost Above\Boost Below\Cut Above\Cut Below
- Threshold: -90 to 24.0dBu
- Q: 0.27 to 15
- Ratio: 1.0 to 100.0
- Max Gain: 0.0 to 12.0
- Attack: 1 to 2895ms
- Frequency: 20 to 22000Hz
- Release: 1 to 2895ms
- Type: BYPASS\PEQ
- Bypass button to switch
4.3.5 DSP functions setting - DELAY (input and output)
4.3.6 DSP functions setting - MATRIX MIX
In the above figure, input channels (on top side) corresponds to output channels(on left side). The value box with a value is mixing key of channels. When the mixing key is green (double-click the value box to switch the state), the input channel and output channel signal realizes the mixing function.
The right part of the above figure contains the gain, reset button, and clear button of the matrix mix. Click the value box on the left, and then drag the sliding block of the matrix mix gain or enter a value in the value box to adjust the matrix block Click the reset button to reset the matrix mixing function to the initial one-to-one state; click the clear button to clear all the matrix mixing functions, and there is no correspondence between the input and output of the device.
4.3.7 DSP functions setting - COMPRESSOR
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- Soft knee: 0 to 30;
- Threshold: -90.0 to 24.0 dB;
- Attack: 1 to 2895 ms;
- Ratio: 1.0 to 100.0;
- Release: 1 to 2895 ms;
- Click
 to enable this function;
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4.3.8 DSP functions setting - LIMITER
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- Threshold: 0.0 to 24.0dBu;
- Release: 1 to 2895 ms;
- Click
 to enable this function;
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4.3.9 DSP functions setting - OUTPUT
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- Set phase of signal;
- Set mute of output channel;
- Set gain of output channel.
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4.4 Monitoring and setting of channels
User can monitor gains level of input and output channels.
4.4.1 Channel gain level
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There are 4 kinds of input signal in some products: ANALOG, DANTE network audio, AES digital audio, testing signal. It will show a label for user.
Input value, drag gain fader or use mouse pulley to set value of gain.
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4.4.2 Quick buttons of DSP in channels
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M Mute
+ Phase
N Noise Gate
E PEQ
D Delay
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M Mute
E PEQ
D Delay
C Compressor
L Limiter
+ Phase
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4.4.3 Group and channels link
User can quickly set channels in groups for opening or closing mute, phase, noise gate, PEQ and delay function.
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M Mute
+ Phase
N Noise Gate
E PEQ
D Delay
Channels link for input
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M Mute
E PEQ
D Delay
C Compressor
L Limiter
+ Phase
Channels link for output
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When click link button, Channels Link window would show as below:
Select the corresponding channels to link, they will be in group for user to set parameter.
4.5 Menu - File
New project: the project is restored to the initial open state.
Demo Device: user can view all the functions of the device without affecting the specific device connected.
Open: open an existing device management project from the computer disk.
Save: save the current equipment management project in the computer disk.
Save as: save the current equipment management project to the computer disk.
4.6 Menu - Device (including Device lock)
Devices: view or modify the software version information, device name and device IP address of the upper and lower computer of the device. Set password of device.
Channel name: set the name of each input and output channel, with memory function.
Channel copy: copy device input and output channel parameter, can realize cross-device copy parameter (Note: the same type of device is required).
Central control: provides user a quickly way to inquiry code of Center Control setting. More details, please refer to another user manual
, it provides whole guide and codes for user to match every specific system.
Device locking User can set his own password of this device to protect audio project after setting parameters. After unlock the device in software, user can clear password or reset the password.
The password can be in four-digit format (0,1,2...9), so that user can use the control software or the front panel of device to unlock the password. If the device is locked, there is a icon showed in software and LCD display, as per Figure 7.18.1
Figure 7.18.1
Input the password in software to unlock the device
Input the password in LCD display to unlock the device
When device is locking, user can press mute button of each channels in front panel. Press either of BACK, NEXT, MENU, ENTER, BYPASS, QUIT button, LCD will show interface to input password, press GAIN button to select digit, and press BACK or NEXT to select digit position. Then select “OK” and press ENTER to unlock device.
If wrong input, software will remind user there is only 5 times to input right password. More than 5 times, device can’t be unlock any more, user have to return this device back to dealer or factory. The dealer or factory will reset the device and clear all parameter settings.
Successfully input password and enter main interface
4.7 Menu - Connection
Port: set the connection mode, port number and baud rate, confirm the connection mode and then select the corresponding port.
Connect: connect and download the device parameter.
Disconnect: disconnect the connected device.
Connect all: connect and download the device parameter of all devices in the device list.
Disconnect all: disconnect all connected devices in the device list.
4.8 Menu - Preset
Save: select the saved gear, save all the parameter of the current automatic gear of the machine to the device preset (2~30 Preset bit).
Recall: call the device preset to the current automatic gear position.
Delete: delete the existing preset, the default file cannot be deleted, over written or saved.
Clear: delete all presets in the device.
Boot: select a certain preset, after setting it as the boot file, each time the device is powered on, it will automatically call the save the parameter; the last set parameter need to be automatically saved, please set the automatic file to the boot file.
Import preset: import a single preset file on the computer.
Export the preset: export all the parameter of the current state to the computer, and generate a single preset file.
Import preset package: import the preset package file containing multiple presets on the computer.
Export preset package: pack multiple presets in the machine’s preset into one preset package and export it to the computer.
4.9 Menu - System
Language: multi-language switching, supports simplified, traditional, and ENGLISH.
About: current control software and device firmware version information.
Upgrade: use can upgrade the firmware by using this function, a upgrade .bin file should be needed from seller or speaker factory. In general, no need to upgrade the firmware in device. Only there is a bug or new function in software, upgrade function will be used.
4.10 FIR filter and function
4.10.1 FIR filter and applications
When user uses PEQ to adjust audio signal and set a linear magnitude, he can find the phase of signal changed, due to IIR filter. However, DSP products provide user a useful tool FIR filter to adjust audio signal with a linear phase.
Some calculation:
Frequency resolution = Sampling/Taps
Available min. frequency ≈ Frequency resolution*3
Means when use adjust audio signal with 48kHz, 1024 taps, FIR filters will take effect in frequency above 141Hz of audio signal. The taps value more high, the FIR filter curve more steep.
FIR filter processing audio signal will produce a certain delay:
Delay = (1/Sampling Hz)*Taps/2
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Taps
Sampling
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48kHz
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96kHz
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256
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2.67ms, LF 563Hz
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1.33ms, LF 1125Hz
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512
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5.33ms, LF 279Hz
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2.67ms, LF 558Hz
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768
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7.99ms, LF 188Hz
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4.00ms, LF 375Hz
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1024
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10.67ms, LF 141Hz
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5.33ms, LF 281Hz
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2048
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21.33ms, LF 70Hz
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10.67ms, LF 141Hz
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Applications:
- Linear of the phase curve of the speaker;
- Match the phase and magnitude of different speaker models within the same product line, as well as different speaker models in the installation project to make it easier to debug speaker groups and arrays;
- Dealing with linear array systems (for audience area coverage optimization);
- Frequency division optimization to improve the consistency of frequency response of multi-division speakers over their coverage Angle range.
Devices required:
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Measurement Microphone
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×1
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Audio Interface
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×1
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Windows PC
(installed software including Smaart, rePhase or FIR Designer, DSP 4.8)
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×1
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FIR audio processor or DSP network power amplifier
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×1
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Speaker
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×1
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Connection schematic diagram:
4.10.2 Using FIR DESIGNER in DSP 4.8 to adjust FIR magnitude and phase
Beside using third party software, DSP 4.8 provides user a more convenient way to adjust FIR magnitude and phase of each channels.
There are two ways to open FIR DESIGNER interface:
① Click “FIR” - “Designer” button to enter FIR automatic linear magnitude and phase function interface.
② Or click “FIR DESIGNER” in main interface to enter FIR automatic linear magnitude and phase function interface, which can quickly help user return to the page he set last time.
Let’s begin to set:
4.10.2.a FIR DESIGNER - Import
- Load: load speaker measurement file from Smaart, usually it’s a .txt file.
- Import Clipboard: load ASCII data directly from Smaart.
- Clear: clear measurement data.
- Normalise magnitude to max or Magnitude offset (dB): this can help user to adjust a certain dB of magnitude, in order to adjust magnitude curve as little as possible.
4.10.2.b FIR DESIGNER - FIR-EQ
There are High pass filter and low pass filter for setting frequency divider, and 15 bands of PEQ \ LSLV \ HSLV to adjust magnitude. Try to set a linear magnitude of target speaker.
Mark: changing FIR magnitude doesn’t effect its phase.
4.10.2.c FIR DESIGNER - Magnitude Correction and Phase Correction
Of course, if there are too many speakers to be adjust, user has to spend a long time manually adjusting their magnitude. In this case, Magnitude Correction will be more useful. Just enable ON button for frequency.
After adjusting magnitude, set linear phase of speaker.
4.10.2.d FIR DESIGNER - Generate
Select Taps (such as 512) of this adjustment, and store it in a FIR channel. User can also name this FIR adjustment and export it to a .KF file. After finish all setting, return back to FIR interface. Cancel BYPASS button to make it work.
