Stereo Audio Matrix Switcher 8x8, with EQ/Mixer
PTN Electronics Limited www.PTN-electronics.com
MPA88
PTN Stereo Audio Matrix Switcher 8x8, with EQ/Mixer
USER MANUAL
Version: MPA882013V1.1
Stereo Audio Matrix Switcher 8x8, with EQ/Mixer
PTN Electronics Limited www.PTN-electronics.com
NOTICE: Please read this user manual carefully before using this product.
Update History
Version
Date
Update Content
1.0
2011.07.07
First version.
1.1
2013.05.24
Modified the system diagram.
This manual is for operation instruction only, not for any maintenance usage. The
functions described in this version are updated till May 2013. Any changes of
functions and parameters since then will be informed separately. Please refer to
the dealers for the latest details.
This manual is copyright PTN Electronics Limited. All rights reserved. No part of
this publication may be copied or reproduced without the prior written consent of
PTN Electronics Limited.
All product function is valid till 2013-05-24.
Stereo Audio Matrix Switcher 8x8, with EQ/Mixer
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Table of Contents
1. Introduction .............................................................................................................. 2
1.1. Introduction to MPA88 ..................................................................................... 2
1.2. Package Contents ........................................................................................... 2
2. Features ................................................................................................................... 2
3. Specification ............................................................................................................. 3
4. Interface Connection Introduction ............................................................................ 4
4.1. Interface Introduction ....................................................................................... 4
4.2. Audio Signal Connection ................................................................................. 4
5. Operation of the Control Panel ................................................................................. 5
5.1. Operation of the Control Panel ........................................................................ 5
5.1.1. Audio switching .................................................................................... 5
5.1.2. Audio Preset: ........................................................................................ 5
6. System Diagram ....................................................................................................... 6
7. Communication Protocol and Command Codes ...................................................... 6
8. Panel Drawing ................................................................................................ .......... 9
9. Troubleshooting & Maintenance ............................................................................. 10
10. Safety Operation Guide ...........................................................................................11
11. After-sales Service ................................................................................................. 12
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1. Introduction
1.1. Introduction to MPA88
MPA88 is a high-performance matrix switcher for stereo audio, and built in the EQ for
every channel of input and output, and built in the audio mixer in the output channel 1.
It the great audio processor, which can work in the high-end conference rooms,
multimedia rooms etc.
It supports the cross-point switching, and each input channel is bass/treble
independently preset, and each output volume is independently preset.
1.2. Package Contents
1 x MPA88
1 x Power Cord
16 x Captive screw connectors
4 x Plastic cushions
1 x RS232 cable
1 x User Manual
Notes: Please confirm if the product and the accessories are all included, if not,
please contact with the dealers.
2. Features
Each input volume is built in the EQ function, working independently. The
bass/Treble is 15 degree preset-able. The volume is 61 degree preset-table.
Each output volume is independently preset-able, 61 degrees.
Output 1 is built in the audio mixer, which can programmable mix any input channel,
by RS232 or PTN software.
Compatible with stereo audio, balance/unbalance connection is available.
Cross-point switching & fast switching speed.
9 global preset function to save the switching/setting status, and recall it anytime.
Programmable grouping function. The user can group several input/output
channels, and control at the same time.
Controllable via RS232, with smart feedback.
Extensibility: It can be controlled by PTN panel (WP8), optional function.
Built-in Gain Compensation and Synchronization Signal Proofread technology.
Antistatic case design to provide good protection for long-term and stable
performance.
Rack-mountable metal enclosure, suitable for 19inch rack standard.
Internal international power supply (100Volt~240Volt AC, 50/60Hz) for worldwide
compatibility.
LED indicator, for power and working status.
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3. Specification
Audio Input
Audio Output
Input
8 stereo,
balanced/unbalanced
Output
8 stereo,
balanced/unbalanced
Input
Connector
Captive screw
connectors, 5 pole
Output
Connector
Captive screw
connectors, 5 pole
Input
Impedance
>10KΩ
Output
Impedance
50Ω
Audio General
Bandwidth
350MHz(-3dB), fully
load
Switching
Speed
200ns(Max)
Mixer
Processor
Built in DSP effects
Mixer Max.
Output Gain
21 dB
Input Volume
61 degrees
controllable/preset
Output Volume
61 degrees
controllable/preset
13 degrees Bass/Treble
controllable/preset
Frequency
Response
20Hz ~ 20KHz,
±0.5dB
CMRR
>90dB@20Hz~20KHz
Stereo
Channel
Separation
>80dB@1KHz
THD + Noise
1%@1 kHz,
0.3%@20KHz at
nominal level
Audio Bits per
Sample
18 bits per channel, 2 channels (L, R)
Control Parts
Control/
Remote
buttons; RS-232
(9-pin female D
connector)
Pin
Configurations
2 = TX, 3 = RX, 5 =
GND
Options
TCP/IP control by PTNET
General
Max DC
Compensation
1.5V
Power
Consumption
15W
Temperature
-20℃ ~ +70℃
Humidity
10% ~ 90%
Power Supply
100VAC ~ 240VAC,
50/60Hz
Product
Weight
2.15Kg
Case
Dimension
W483 x H44 xD235mm (1U high, full rack wide)
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4. Interface Connection Introduction
4.1. Interface Introduction
Figure 4-1 The Rear Panel of MPA88
No.
Name
Description
①
AUDIO INPUTS
8 in total, 5-pole captive screw connector.
②
AUDIO OUTPUTS
8 in total, 5-pole captive screw connector (The
mixer output is the output1).
③
RS232
The serial port, 9-pin female connector.
④
AC100V~240V
Alternating current for power supply.
4.2. Audio Signal Connection
The ports AUDIO INPUTS can be connected with any audio source devices, such as
DVD player. And the ports AUDIO OUTPUTS can be connected with amplifiers.
Audio connection is little complicated than video. It has two kinds of connection:
balanced and unbalanced.
The balanced connection transmits a pair of balanced signals with two signal cords.
Because interferences will have the same intensity and the opposite phases on the
two signal cords, it will be counteracted in the end. For the low frequency extent of the
audio signal, it would be easily interfered under long distance transmission. Therefore,
as an anti-interference connection, it is mostly used in audio connection of special
device.
The unbalanced connection transmits signals only with a signal cord. Without
counteraction, it can be interfered more easily. Accordingly, it is adopted for household
appliance or some cases with low technical demand.
Take the audio signal line for example: 1.Unbalanced: pin “G” connect to SLEEVE, pin
“+” connect to TIP, pin “–” connect to pin “G”; 2.Balanced: pin “G” connect to SLEEVE,
pin “–” connect to RING, pin “+” connect to TIP. As shown in the following figure:
Unbalanced Input
Tip
Tip
Sleeve
Balanced Input
Tip
Ring
Tip
Ring
Unbalanced Output
Tip
Tip
Sleeve
Sleeves
Sleeves
Balanced Output
Tip
Ring
Tip
Ring
Sleeves
5 bit 3.8mm Audio Balanced/unbalanced Connection
① ② ③ ④
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Which connection to select is up to the interface of the device. When available, the
balanced connection is the first choice. Before connection, please read the command
or relevant demand in the user manual carefully. In some cases, maybe there is
balanced in source signal end but unbalanced in the destination end. If in a
nonstandard case, it is done to connect balanced for the balanced end and
unbalanced for unbalanced end. But if in a standard one, the converter must be used
to switch the signals as the same, balanced or unbalanced.
5. Operation of the Control Panel
5.1. Operation of the Control Panel
The front panel buttons provides the control of audio signal switching & preset.
No.
Buttons
Function Description
①
INPUTS
Input buttons, ranging from "1" to "8".
②
Preset
To remember the switcher status and save inside the
MPA88, and recall it for action.
③
OUTPUTS
Output buttons, ranging from "1" to "8".
5.2. Audio switching
We can switch the MAP matrix switcher by front panel number “1,2,3,4,5,6,7,8”.
The operation order is: input -> output
Example1. switching the audio input 3 to output 8. We need to press input “3” in the
front panel, and press output “8”.
Example2. switching the audio input 5 to output 1,3,4,5. We need to press input “5” in
the front panel, and press output “1”, “3”,”4”,”5”.
After the pressing, the matrix switcher will carry out the operation and the LED will
flash for three times.
5.3. Audio Preset
MPA88 provides 9 global presets (from F1 to F9) to remember the switcher status and
save inside the MPA88, and recall it for action. The RS232 command “Save” is for
remembering the presets (9 in total). The button “preset” can recall the preset, by
pressing “number” button and “preset” button.
For example, to recall the preset F3, you need to press “3” on the front panel, and then
press “preset” on the front panel.
① ② ③
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6. System Diagram
7. Communication Protocol and Command Codes
Communication Protocol: RS232 Communication Protocol
Baud rate: 9600 Data bit: 8 Stop bit: 1 Parity bit: none
RS232
commands
Function Description
/*Type;
Check the system information and ID information.
/%Lock;
Lock the keyboard of the control panel on the matrix.
/%Unlock;
Unlock the keyboard of the control panel on the matrix.
/^Version;
Inquire the version of firmware.
/:Message
Off;
Switch off the feedback command from the com port. It will only show
“switcher OK”.
/:Message
On;
Switch on the feedback command from the com port.
Demo.
Switch to the “demo” mode, 1->1, 2->2, 3->3 … and so on, every 2
seconds, and cycled switching.
Save[Z].
Save the present operation to the preset command [Z]. [Z] ranges
from 0 to 9. (check example 19)
[x1] B[x2].
Transfer the audio signals from the input channel [x1] to the output
channel [x2].
[x1]
Transfer the audio signals from the input channel [x1] to the output
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B[x2],[x3],[x
4].
channels [x2], [x3] and [x4].
RS232
commands
Variable
Code
Function Description
Recall[Z].
Recall the preset command [Z]. (check example 20)
Clear[Z].
Clear the preset command [Z]. (check example 21)
Undo.
To cancel the previous operation.
Audioinit.
Initialize the Volume/Bass/Treble, recover to the factory
default level.
VOICE.
Checking the level of Volume/Bass/Treble of all the
channels
[y]API[xx].
y=9
preset the volume of all the 8 inputs. (check example 1)
y=y1,y2
…y7
preset the volume of input y1,y2..y7 at the same time.
(check example 2,5)
[xx] is
from "00"
to "60"
preset the volume of input [Y], 61 degrees. (check
example 4,5)
[xx] =
[UP]
Turning up the volume of input [Y]. (check example 1,2)
[xx] =
[DO]
Turning down the volume of input [Y]. (check example 3)
[z]APO[y]
[xx].
[z]=9
Preset the volume of all the 8 outputs. (check example 6)
[z]=z1,z2
…zn
preset the volume/bass/treble of input y1,y2..yn at the
same time. (check example 7)
[Y] = [H]
[xx] is ranging from
"00" to "12"
Preset the treble of output [Z].
(check example 16)
[xx] = [UP]
Turning up the treble of output [Z].
(check example 12)
[xx] = [DO]
Turning down the treble of output
[Z]. (check example 14)
[Y] = [L]
[xx] is ranging from
"00" to "12"
Preset the bass of output [Z].
(check example 15)
[xx] = [UP]
Turning up the bass of output [Z].
(check example 11)
[xx] = [DO]
Turning down the bass of output
[Z]. (check example 13)
[Y] = [A]
[xx] is ranging from
"00" to "60"
Preset the volume of output [Z].
(check example 7,8)
[xx] = [UP]
Turning up the volume of output
[Z]. (check example 7,9)
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[xx] = [DO]
Turning down the volume of output
[Z]. (check example 10)
[x1]AND[x2
],[x3]…[x8].
Input audio mixed to output 1. Maximum 8 channels mixed.(check
example 17,18)
Notice:
1: The letter inside bracket [ ] is the variable code, which is the changeable.
2: The bracket [ ] is not included to the RS232 commands.
3: The mixer output is the output 1.
Example1. Turn down the volume of all the 8 inputs at the same time. We should
send the RS232 command: [9APIUP.]
Example2. Turning up the volume of input 1,2,3,5,6 at the same time. We should
send the RS232 command: [1,2,3,5,6APIUP.]
Example3. Turning down the volume of input 6,7 at the same time. We should send
the RS232 command: [6,7APIDO.]
Example4. Set the volume of input 5 to be the level "37". We should send the
RS232 command: [5API37.]
Example5. Set the volume of input 3,4,5 to be the level "37" at the same time. We
should send the RS232 command: [3,4,5API37.]
Example6. Turn up the volume of all the 8 outputs at the same time. We should
send the RS232 command: [9APOAUP.]
Example7. Set the volume of output 3,4,5 to be the level "37" at the same time. We
should send the RS232 command: [3,4,5APOA37.]
Example8. Set the volume of output 7 to be the level "31". We should send the
RS232 command: [7APOA31.]
Example9. Turn up the volume of output 5. We should send the RS232 command:
[5APOAUP.]
Example10. Turn down the volume of output 5. We should send the RS232
command: [5APOADO.]
Example11. Turn up the bass of output 5. We should send the RS232 command:
[5APOLUP.]
Example12. Turn up the treble of output 5. We should send the RS232 command:
[5APOHUP.]
Example13. Turn down the bass of output 5. We should send the RS232 command:
[5APOLDO.]
Example14. Turn down the treble of output 5. We should send the RS232 command:
[5APOHDO.]
Example15. Set the bass of output 3,4,5 to be the level "37" at the same time. We
should send the RS232 command: [3,4,5APOL37.]
Example16. Set the treble of output 5 to be the level "37”. We should send the
RS232 command: [5APOH37.]
Example17. Mix the input 1,2,3,4,5,6,7,8 to the "mixer" output. We should send the
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RS232 command: [1AND2,3,4,5,6,7,8.]
Example18. Mix the input 5,6 to the "mixer" output. We should send the RS232
command: [5AND6.]
Example19. Save the preset operation to preset command 3. We should send the
RS232 command: [Save3.]
Example20. Recall the preset operation to preset command 3. We should send the
RS232 command: [Recall3.]
Example21. Remove the preset operation to preset command 3. We should send the
RS232 command: [Clear3.]
8. Panel Drawing
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9. Troubleshooting & Maintenance
1) When there is no output audio:
Check if there is any signal at the input.
Check if there is any signal at the output.
We can check these by using an oscilloscope or a multimeter. If there is no
signal input/output, maybe the input/output cables broken or the connectors
loosen, please change for another cable.
Check if the output port number is the same with the controlled one.
If not the problem mentioned above, probably there is something broken inside
the unit, please send it to the dealer for repairing.
2) If the POWER indicator doesn’t work or no respond to any operation, please make
sure the power cord connection is good.
3) If the static becomes stronger when connecting the audio connectors, it probably
due to bad grounding, please check the grounding and make sure it connected
well, otherwise it would damage the converter.
4) If the MPA88 matrix cannot be controlled by the keys on the front panel, RS232
port, the unit may has already been broken. Please send it to the dealer for
repairing.
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10. Safety Operation Guide
In order to guarantee the reliable operation of the equipments and safety of the staff,
please abide by the following proceeding in installation, using and maintenance:
1) The system must be earthed properly. Please do not use two blades plugs and
ensure the alternating power supply ranged from 100v to 240v and from 50Hz to
60Hz.
2) Do not put the switcher in a place of too hot or too cold.
3) As the power generating heat when running, the working environment should be
maintained fine ventilation, in case of damage caused by overheat.
4) Please cut off the general power switch in humid weather or left unused for long
time.
5) Before following operation, ensure that the alternating current wire is pull out of the
power supply:
Take off or reship any components of the equipment.
Take off or rejoin any pin or other link of the equipment.
6) As to non-professional or without permission, please DO NOT try to open the
casing of the equipment, DO NOT repair it on your own, in case of accident or
increasing the damage of the equipment.
7) DO NOT splash any chemistry substance or liquid in the equipment or around.
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11. After-sales Service
1) If there appear some problems when running MPA88, please check and deal with
the problems reference to this user manual. Any transport costs are borne by the
users during the warranty.
2) You can email to our after-sales department or make a call, please tell us the
following information about your cases.
Product version and name.
Detailed failure situations.
The formation of the cases.
3) We offer products for all three-year warranty, which starts from the first day you buy
this product (The purchase invoice shall prevail).
4) Any problem is same with one of the following cases listed, we will not offer
warranty service but offer for charge.
Beyond the warranty.
Damage due to incorrectly usage, keeping or repairing.
Damage due to device assembly operations by the maintenance company
non-assigned.
No certificate or invoice as the proof of warranty.
The product model showed on the warranty card does not match with the model
of the product for repairing or had been altered.
Damage caused by force majeure.
Remarks: For any questions or problems, please try to get help from your local
distributor, or email PTN at: support@PTN-electronics.com.
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