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20
en | Operation
7
7.1
PM 502
Operation
Mono input
GAIN control
Rotary control for adjusting a MIC/LINE input’s sensitivity. These controls let you optimally adjust the incoming signals to the mixer’s internal operation level. Slight adjustments can offer the benefits of an improved S/N-ratio and provides you with the full bandwidth of the
PM 502’s outstanding sound capabilities. The following gain setting instruction is to be used as a guide to help achieve a good signal input level:
1.
Set the MASTER volume controls to their minimum values (counterclockwise).
2.
Set the GAIN control and the corresponding channel VOLUME control to their center position.
3.
Connect the sound source (microphone, instrument, etc.) to the desired MIC/LINE input.
4.
Start the sound source at the highest volume level to be expected – respectively sing or speak as loudly as possible directly (close up) into the microphone.
5.
While playing the sound source or singing into the microphone, adjust the input level using the GAIN control, so that during the loudest part, the PK LED does not light up. This is the basic channel setting, leaving you with at least 6 dB of headroom, i.e. you have at least a range of 6 dB before signal clipping occurs.
If you intend to make further adjustments to the channel’s EQ setting, you should perform steps 4 and 5 again, as changes in the sound shaping section also have an influence on the channel’s overall level.
HI/MID/LO controls
The mixer’s EQ section allows for a broad difference in the shaping of the incoming audio signal within three frequency bands. Turning one of the EQ level controls to the right enhances/amplifies the corresponding frequency range while turning it to the left lowers/ attenuates the signal of that specific frequency band. Before you begin to alter the sound, all
EQ controls should be set to their neutral position, i.e. their marker points straight up (locked in place). Try not to set the EQ controls to extreme positions. Usually, minor changes are sufficient to produce the best results in the overall sound. You should use the natural reproduction as a starting point and rely on your musically trained ear. The moderate use of the MID control is the best remedy to avoid acoustical feedback. You should try to avoid using this frequency range to an extreme level. Lowering the level in this band will provide you with higher output and help reduce feedback. Adjust the LO control to your taste, to add more
“punch” to the sound of a kick drum or “body” to the vocals. Use the HI control in the same way to provide cymbals and vocals with more treble for a more transparent sound.
FX control
The FX controls is used to set the amount of effect you require on that channel input to be routed to the integrated FX effects unit. The signal path is split post VOLUME control so that the volume setting also influences the amount of the signal that is fed to the FX unit. Using the
FX controls lets you easily assign an effect for groups of musical instruments or vocals. To determine the desired level of the effect, you should start with the controls set at their center and make individual adjustments from there on.
Please monitor the PK LED in the FX channels. The indicator should only light up briefly at the occurrence of high signal peaks. If the indicator is constantly lit, you should lower the send levels of those channels where the program peaks occur. For further information, please read the paragraphs about the FX unit.
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PM 502 Operation | en
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AUX control
The AUX control is primarily meant for establishing an independent mix, e.g. for monitor or a second room/zone. The signal routing is always pre VOLUME control.
PK indicator
The peak indicator plays a key role when setting input levels. The PK (peak) LED on the
PM 502 provides a visual indication of the risk of distortion before you hear it through the connected speaker systems. The peak indicator checks the signal level pre and post of the channel’s VOLUME control and indicates the maximum of both levels. If the PK LED blinks frequently or lights continuously, the corresponding channel is likely to start clipping and you will need to reduce the volume slightly. The peak LED are triggered at a level of -6 dB below the point of distortion.
If lowering the channel VOLUME is not sufficient to reduce signal peaks, carefully turn the
GAIN control down.
Keeping an eye on the indicator during a performance is also a good idea, because some changes in the bands dynamics or even a change in keyboard settings can easily lead to channel clipping, resulting in the degradation of the overall sound.
VOLUME control
The VOLUME control sets the volume of the corresponding channels, resulting in a balanced mix. The control should be positioned initially at “5”, leaving you with enough flexibility to balance the mix. The overall volume is adjusted through the use of the master controls. Even though the channel controls offer an additional level of +15 dB, we would like to advise you to exceed the “8” mark only in very few exceptional cases. If the PM 502’s summing bus gets
“overloaded” with too many “high level” input channels, despite its special gain structure, the summing amplifier could be driven into clipping.
The best signal to noise ratio can be achieved if channel volume and master volume controls are set in the same range.
Bosch Sicherheitssysteme GmbH User manual 15-May-14 | 02 | F01U297804
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en | Operation
7.2
PM 502
Stereo input
GAIN switch
Use the GAIN switch for switching between high (HI) or low (LO) input signal amplification.
The default setting is LO (-5 dB), which is suitable for all high level input sources like keyboards or CD players. HI gain should be engaged when connecting low signal level instruments like bass or guitar.
HI/MID/LO control
The mixer’s EQ section allows for a broad difference in the shaping of the incoming audio signal within three frequency bands. Turning one of the EQ level controls to the right enhances/amplifies the corresponding frequency range while turning it to the left lowers/ attenuates the signal of that specific frequency band. Before you begin to alter the sound, all
EQ controls should be set to their neutral position, i.e. their marker points straight up (locked in place). Try not to set the EQ controls to extreme positions. Usually, minor changes are sufficient to produce the best results in the overall sound. You should use the natural reproduction as a starting point and rely on your musically trained ear. The moderate use of the MID control is the best remedy to avoid acoustical feedback. You should try to avoid using this frequency range to an extreme level. Lowering the level in this band will provide you with higher output and help reduce feedback. Adjust the LO control to your taste, to add more
“punch” to the sound of a kick drum or “body” to the vocals. Use the HI control in the same way to provide cymbals and vocals with more treble for a more transparent sound.
FX control
The FX controls is used to set the amount of effect you require on that channel input to be routed to the integrated FX effects unit. The signal path is split post VOLUME control so that the volume setting also influences the amount of the signal that is fed to the FX unit. Using the
FX controls lets you easily assign an effect for groups of musical instruments or vocals. To determine the desired level of the effect, you should start with the controls set at their center and make individual adjustments from there on.
Please monitor the PK LED in the FX channels. The indicator should only light up briefly at the occurrence of high signal peaks. If the indicator is constantly lit, you should lower the send levels of those channels where the program peaks occur. For further information, please read the paragraphs about the FX unit.
AUX control
The AUX control is primarily meant for establishing an independent mix, e.g. for monitor or a second room/zone. The signal routing is always pre VOLUME control.
PK indicator
The peak indicator plays a key role when setting input levels. The PK (peak) LED on the
PM 502 provides a visual indication of the risk of distortion before you hear it through the connected speaker systems. The peak indicator checks the signal level pre and post of the channel’s VOLUME control and indicates the maximum of both levels. If the PK LED blinks frequently or lights continuously, the corresponding channel is likely to start clipping and you will need to reduce the volume slightly. The peak LED are triggered at a level of -6 dB below the point of distortion.
If lowering the channel VOLUME is not sufficient to reduce signal peaks, carefully turn the
GAIN control down.
Keeping an eye on the indicator during a performance is also a good idea, because some changes in the bands dynamics or even a change in keyboard settings can easily lead to channel clipping, resulting in the degradation of the overall sound.
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PM 502
7.3
Operation | en
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VOLUME control
The VOLUME control sets the volume of the corresponding channels, resulting in a balanced mix. The control should be positioned initially at “5”, leaving you with enough flexibility to balance the mix. The overall volume is adjusted through the use of the master controls. Even though the channel controls offer an additional level of +15 dB, we would like to advise you to exceed the “8” mark only in very few exceptional cases. If the PM 502’s summing bus gets
“overloaded” with too many “high level” input channels, despite its special gain structure, the summing amplifier could be driven into clipping.
The best signal to noise ratio can be achieved if channel volume and master volume controls are set in the same range.
FX
FX ON switch (with indicator)
This switch turns the internal FX unit on and the green LED turns on. Please keep in mind that you can also use an external footswitch for turning the FX unit on or off. In this case, the LED also shows the actual operational status of the FX unit. If you want to use a footswitch, the FX
ON switch has to be engaged first. The FX unit is activated and you can use the footswitch to switch the selected effect program on or off.
FX to AUX control
This control allows you to add the FX output signal (pre volume control) to the AUX channel.
PK indicator
This indicates to the user that the internal FX unit is on the verge of clipping, e.g. at a level of
-6 dB below the risk of overdrive. To achieve an adequate signal to noise ratio, please adjust the FX units’ input level as follows:
1.
Establish a “dry” mix – without effect settings – refer to the previous instructions.
2.
Position the FX VOLUME control at the “5” mark.
3.
Turn the FX/PARAMETER rotary control to select the desired FX program preset.
4.
Press the FX ON switch.
5.
Play the sound source connected to the desired input channel and adjust the desired amount of the FX signal, using the FX controls of this input channel. Repeat this step for all input channels that you want to include in your effect mix.
6.
Monitor the PK LED so that it only lights up from time to time during signal peaks. When clipping occurs, reduce the channels FX control level.
7.
Use the FX to AUX control to add the effect mix to the AUX mix.
8.
Use the FX VOLUME control to add the desired amount of the FX signal to the master mix.
Pay attention to the PK indicators when operating your PM 502 to be able to respond quickly when the signal levels exceed the normal range and start clipping.
VOLUME control
This control is used to determine the amount of effect added to the master mix. If you find that you have to set these controls above the “8” mark, please check if the FX unit’s input signals are adjusted properly.
Bosch Sicherheitssysteme GmbH User manual 15-May-14 | 02 | F01U297804
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en | Operation
7.4
7.5
7.6
PM 502
AUX
Indicators
It is acceptable for the LIM indicator to flicker from time to time because the built in clip limiter prevents distortion. If it is lit continuously, you are at risk of the degradation of your speaker output. In that case, the volume level has to be reduced. The limiter threshold can be
edited in the OUTPUT SETTINGS menu, please refer to section Menu, page 26.
Below the LIM indicator, the PM 502 offers a 3-segment LED chain for visual monitoring of the output level of the signal. The meter’s 0 dB mark is referenced to a 0 dBu output signal at the mixer output.
VOLUME control
The VOLUME control sets the volume of the summed audio signal at the AUX OUT output. The signal present at this output can be selected in the AUX routing menu, please refer to section
MASTER
Indicators
It is acceptable for the LIM indicator to flicker from time to time because the built in clip limiter prevents distortion. If it is lit continuously, you are at risk of the degradation of your speaker output. In that case, the volume level has to be reduced. The limiter threshold can be
edited in the OUTPUT SETTINGS menu, please refer to section Menu, page 26.
Below the LIM indicator, the PM 502 offers a 3-segment LED chain for visual monitoring of the output level of the signal. The meter’s 0 dB mark is referenced to a 0 dBu output signal at the mixer output.
VOLUME control
Level controls to adjust the output signals of the left and right master outputs (MASTER A or
MASTER B). If post mode is selected for MASTER B (see section Menu, page 26) set the
MASTER B level control to its middle position for identical levels on MASTER A or B outputs.
Microphone processing
During operation the audio signal processing can be adjusted by using the switches
COMPRESSOR, TALK OVER or MUTE, this settings always affect the input signals of all MIC/
LINE channels. The current status is indicated by the corresponding LED next to each button.
Advanced microphone processing settings are available in the menu, please refer to section
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PM 502
7.7
Operation | en
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Notice!
Effect of MIC PROCESSING
The AUX-Bus signal is only affected by MUTE, so COMPRESSOR or TALK OVER have no effect on the AUX-Bus signal.
COMPRESSOR
Engage the COMPRESSOR switch to activate the integrated compressor. The compressor reduces the dynamic range of audio signals. Once the signal exceeds a certain threshold, the signal gets compressed, i.e. major input level changes result in minor output level changes.
Narrowing the dynamic range often allows for easier recording or mixing the audio signal.
TALK OVER
Engage the TALK OVER switch to activate the integrated ducking facility. The ducking facility reduces the level of the signals at the STEREO inputs whenever a signal is present at the MIC/
LINE inputs. If there is no MIC/LINE signal present the STEREO signal automatically returns to its preset level.
MUTE
Engage the MUTE switch to mute all MIC/LINE input signals.
Equalizer
The PM 502 employs a 7-band stereo graphic equalizer (GEQ). Seven frequency bands offering
10 dB gain/reduction and a quality of Q = 1.5 allow the shaping of the overall sound to meet your personal preferences or to optimally match it to the acoustic conditions of different locations.
Independent graphic equalizers for MASTER A, MASTER B or AUX (each adjustable via hardware controls or the rotary encoder) are available in the menu, please refer to section
GEQ setting instructions
The frequency ranges as well as the characteristics of the EQ faders are very practiceoriented. If you want to have a clear and highly intelligible sound, which, as a side effect, provides the cymbals with a more crisp sound, you should raise the levels of the 12 kHz or 6 kHz band a bit. If the mids are nasa you should attenuate the mid range (400 Hz to 2.5 kHz) by a few decibels. To provide the kick drum with more punch you have to boost the low frequency range, using the 63 Hz or the 160 Hz controls. In case the overall sound is undefined with too much bass, lowering the levels of these two frequency bands will solve the problem.
However, especially with equalization you should be aware of the fact that in most cases fewer adjustments provide better results. Thus, your first choice should be to establish the mix using only the input channel controls and see if you get a satisfactory result.
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en | Operation
7.8
Display
PM 502
7.8.1
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The PM 502 includes a back-lit LC-display.
Home screen
The home screen appears after switching the PM 502 on. After a few seconds the currently selected effect (number and name) is displayed. If effect parameters have been edited, an “E” is indicated next to the preset number. Turn the FX/PARAMETER rotary control to select another effect.
In the lower part of the display settings of the channels MASTER A, MASTER B and AUX are indicated, please refer to following table.
Icon
/MIC
POST
M
DLY
MAS. A PRE or MAX. A POST
Equalizer control icon
EQ
LIM
Speaker icon
Description
LO CUT in menu MIC PROCESSING is activated.
The master routing of channel B is set to Post.
The channel is set to Mono.
The delay of the channel is activated.
Indicates the AUX Mode setting of the AUX channel.
The hardware equalizer controls are used to edit the equalizer settings of this channel.
The equalizer setting of the channel is not set to flat.
The threshold of the output limiter has been edited.
Indicates the Amp Routing. If a Dual Amp Routing is selected speakers for output channel 1 or 2 are indicated.
Table 7.1: Indicators in home screen
If the screensaver is activated the Dynacord logo and the device name (assigned in the DEVICE
SETUP menu) is indicated after some time.
Menu
Press the MENU/ENTER rotary encoder to access the menu.
In menu the MENU/ENTER rotary encoder is used for navigation and for selecting and editing parameters. Turn the MENU/ENTER rotary encoder to the left or to the right to move the cursor in the menu. Press the MENU/ENTER rotary encoder to select the highlighted menu item. The value is shown in inverse font and can be edited by turning the MENU/ENTER rotary encoder. Press the MENU/ENTER rotary encoder again to apply the edited parameter value.
Following table lists the content of the menu.
User manual Bosch Sicherheitssysteme GmbH
PM 502 Operation | en
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Menu item
EDIT FX
AUDIO PLAYER
MIC PROCESSING
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
•
Subitems/parameter range
(default setting in bold)
Depends on effect type.
Description
Folder/Track name
Progress bar
Buttons for Start/Pause/
Back/Forward
REPEAT/RANDOM selection
AUTO PLAY selection
This dialog allows editing effect parameters of the effect unit.
Select RESET to reset all parameters to their default values.
This dialog allows to use the integrated MP3 player.
When AUTO PLAY is selected the playback of MP3 files will start automatically when a USB drive is connected.
LO CUT: Off, 80 Hz, 150 Hz When the low cut filter is activated, frequencies below 80 Hz (or 150
Hz) are attenuated.
COMPRESSOR PRESET:
Soft, Hard
COMPRESSOR
THRESHOLD: The range depends on the selected compressor preset.
COMPRESSOR TYPE: 2:1
Ratio, 4:1 Ratio, Limiter,
Uplift Soft
COMPRESSOR ATTACK: 1–
1000 ms
COMPRESSOR RELEASE:
50–10000 ms
COMPRESSOR MAKEUP
GAIN: 0 – +6 dB
TALK OVER PRESET:
Announcer, Singer,
Instructor, Presenter
TALK OVER THRESHOLD:
-50 – -10 dB
TALK OVER DAMPING:
-100–0 dB
TALK OVER ATTACK: 0–
1000ms
TALKOVER HOLD: 0.0–
99.9s
TALK OVER RELEASE: 0.1–
30.0s
The compressor settings allow adjusting the microphone processing to your application.
The talk over settings allow adjusting the microphone processing to your application.
Please refer to section Microphone
processing (TALK OVER), page 19
for more details.
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en | Operation PM 502
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Menu item
SPEAKER PROC
MASTER A EQ
MASTER B EQ
AUX EQ
MASTER ROUTING
•
•
•
•
•
Subitems/parameter range
(default setting in bold)
Low Pass Notch: Flat,
Medium, High
SLIDERS-LINK
Frequency bands 63 Hz,
160 Hz, 400 Hz, 1 kHz,
2.5 kHz, 6 kHz, 12 kHz
• MASTER A: Mono, Stereo
MASTER B: Pre, Post;
Mono, Stereo
MAS. B Delay: : 0.0–50
Meters
Description
This menu is used to edit the LPN
Speaker Processing filter setting of the integrated power amplifiers.
Please refer to section Speaker
processing (LPN), page 17 for more
details.
If the DIRECT DRIVE mode is activated, the Low Pass Notch filter is always bypassed.
Activate the entry SLIDERS-LINK to edit the levels of the corresponding
GEQ bands using the GEQ hardware controls. If not activated, edit the bands in the display using the FX/PARAMETER rotary control.
When MASTER A is set to Stereo, the MASTER A L/R signal is not changed and outputted in stereo.
When Mono is selected the
MASTER A L/R signal is summed and outputted in mono at MASTER
A L and also MASTER A R.
When MASTER B is set to Pre, the audio signal is tapped pre MASTER
A volume control and therefore not affected by the MASTER A control’s setting. When MASTER B is set to
Post, the audio signal is tapped post MASTER A volume control and therefore affected by the MASTER A control’s setting. This mode is mainly used for subwoofers or delay lines.
When MASTER B is set to Stereo, the MASTER B L/R signal is not changed and outputted in stereo.
When Mono is selected the
MASTER B L/R signal is summed and outputted in mono at MASTER
B L and also MASTER B R.
The MASTER B signal can be delayed up to 145.8 ms. The unit can be switched between milliseconds (ms), meters and feet.
User manual Bosch Sicherheitssysteme GmbH
PM 502 Operation | en
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Menu item
OUTPUT SETTINGS
DEVICE SETUP 1
DEVICE SETUP 2
INFORMATION
•
•
•
•
•
•
•
•
•
Subitems/parameter range
(default setting in bold)
Description
•
•
•
•
DIRECT DRIVE: Off, On/
50Hz HPF, On/70Hz HPF
AMP ROUTING: MASTER A,
MASTER B, AUX, Dual A – B,
Dual A – AUX, Dual B – AUX
•
•
•
• AUX Mode: AUX-Bus, MAS.
A Pre, MAS. A Post
Limiters:
MASTER A: -10 – +11 dBu
MASTER B: -10 – +11 dBu
AUX Limiter: -10 – +11 dBu
In this menu you can configure advanced features of the PM 502 outputs. Please refer to the corresponding sections for more details:
•
•
•
The audio limiter thresholds can be set independently for the MASTER
A, MASTER B or AUX output signals.
LCD Auto Dim: Off–60 Min.
Dim Brightness: 0–100%
After the time set here the display brightness is dimmed. The brightness of the display in dimmed mode can be adapted to the installation location.
Screensaver: Off–60 Min.
(default: Off)
Personalize
Lock/Unlock: 0000–9999
Lock Mode: Custom, Level
1,2,3
Factory Reset
After the time set here the screensaver is activated. You can personalize the device name shown in the screensaver screen.
Enter a 4 digit PIN (password) to lock certain parameters of the
PM 502. Please refer to section
Locking, page 18 for more details.
Pressing the MENU/ENTER rotary encoder opens a “Reset all settings?” safety dialog box. Select
YES to reset the PM 502 to its factory settings. Select NO to return to the DEVICE SETUP menu.
If the device is locked a factory reset is not possible.
Firmware
Mains: Voltage and frequency
Int. Temp: Current and maximum value
Logging
Indicates the firmware version installed, the current supply voltage and frequency and the internal temperature of the device. The entry Logging is for service only.
Table 7.2: Menu
Bosch Sicherheitssysteme GmbH User manual 15-May-14 | 02 | F01U297804
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en | Operation
7.9
Indicators
PM 502
This section describes the indicators at the front panel of the PM 502.
Indicator
SPEAKER PROCESSING
100V DIRECT DRIVE
AMP LIMIT
AMP PROTECT
Description
This indicator lights up blue when the internal speaker processing of the PM 502 is activated in the menu. Please refer
to section Speaker processing (LPN), page 17 for more details
about this mode.
This indicator lights up green when the 100 V Direct Drive
mode is activated in the menu. Please refer to section 100 V
Direct Drive, page 16 for more details about this mode.
This yellow indicator signals that you are operating the PM 502 at the internal power amp’s limit. Frequent blinking of the LED is acceptable, since the amplifier’s incorporated clip limiter prevents distortion. Continuous lighting indicates that you have to be aware of degradation in the output sound. In that case, the MASTER (or AUX) level has to be reduced. The LIMIT LED also lights up if the output level is reduced because of high amplifier temperature or too high output current in abnormal load conditions.
This indicator lights up red when one of the PM 502’s extensive protection circuits – against thermal overload, HF-induction,
Back-EMF, DC at the outputs, and short circuit protection – is activated. When the PM 502 is in protect mode, the speaker outputs are disabled to prevent the power amp from being damaged. In this case you should first check whether the ventilation slots are blocked. Another cause could be that you have connected more than two 8 Ω speaker systems per power output in low-Z mode. Please also disconnect the speakON or
Euroblock connectors and check the speaker cables for short circuits.
Table 7.3: Front panel indicators
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PM 502
7.10
Operation | en
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Headphone volume
This control sets the volume of the connected headphones (see section Headphone, page 15).
!
Caution!
Make sure to set the PHONES VOLUME control to its minimum position before connecting headphones. Permanent hearing loss may occur if headphones are used at high volume.
Bosch Sicherheitssysteme GmbH User manual 15-May-14 | 02 | F01U297804
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