Dbx DriveRack PA2 Manuel du propriétaire Page 24
- Page / 70
- Table des matières
- MARQUE LIVRES
Noté. / 5. Basé sur avis des utilisateurs
20
®
devices, turning down the amplifier input attenuators does not change the potential output of the amplifier – it only requires
more input voltage to get full output power. Many amplifiers will clip with an input level greater than +6 dBu when the input
attenuators are turned all the way up. Most mixing consoles can deliver well over +18 dBu of output level before clipping. This
means that with your amps turned all the way up, you are sacrificing 12 dB of headroom, resulting in poorer noise performance
and the potential risk of clipping the amplifier. By adjusting the amplifier controls properly, you can maximize your system’s
performance and protect your loudspeakers. The following diagram illustrates the previous example and shows how it can be
easily remedied by simply lowering the input attenuators on the amplifier to apply 12 dB of attenuation, effectively lowering the
signal level entering the amplifier by 12 dB and fitting the signal within the operational headroom constraints of the amp.
Before
Mixer master output faders
set to unity gain (performance level)
Mixer Max Output
Level: +18 dBu
Amplier Max Input
Level: +6 dBu
Amplier attenuators
turned all the way up
0
Amp clips 12 dB
before mixer!
12 dB dierence
+18 dBu
+18 dBu
+6 dBu
After
+18 dBu
+18 dBu
Mixer master output faders
set to unity gain (performance level)
Mixer Max Output
Level: +18 dBu
Amplier Max Input
Level: +18 dBu
Amplier attenuators lowered
to apply 12 dB of attenuation
0
Both amp and mixer
now clip at 18 dBu
One way to set up your gain structure is to play pink noise through the entire system and adjust each gain stage in the signal
chain in succession using the clip indicators on each device. If there is no clip indicator on your mixer then use the output
meters; most reputable console manufacturers use red LEDs at the top of the meters to show the onset of clipping.
To calibrate the system’s gain structure and PA2 limiters:
WARNING! Although it is highly unlikely that you are using tube amplifiers – since they are not practical for live
sound reinforcement use – please note that some tube amplifiers can be damaged if operated without a load (the speaker)
connected. Therefore, do not perform the following procedure if using tube amplifiers unless you have verified they can be
operated without a load connected. This is not an issue with modern solid state amplifier designs.
1� You will need to send a pink noise signal through the entire system to perform this calibration procedure. Some mixers
have a built-in pink noise generator, which will work. You can also check your smartphone’s app store, as there are many
audio apps now available which have a built-in pink noise generator, or search online for a pink noise sample and burn it
to a CD or load it into your portable music player or smartphone.
2� Once you have your pink noise signal, power down the sound system, disconnect all the loudspeakers from the amplifiers,
and turn all your amplifier attenuators all the way down.
3� Set the +4dBu/-10dBV switch on the back panel of the PA2 to match the nominal operating level of your mixer. See
‘Rear Panel’ on page 6 for more information on this switch.
4� Now, turn the mixer, DriveRack PA2, and amplifiers back on. Go into the PA2’s output limiters and ensure they are all
turned OFF, OVEREASY is turned to OFF, and their THRESHOLD’s are set all the way up to 0.0 dB.
5� Set your mixer’s main output faders to unity gain (0). Play or enable the pink noise. If the pink noise signal is being fed to
a mixer channel, set the mixer channel’s fader to unity gain (0). Adjust the gain/trim control of the channel (or pink noise
level if using the mixer’s built-in noise generator) until the mixer’s main meters read 0 VU.
- Owner’s Manual 1
- U.K. MAINS PLUG WARNING 2
- WARNING FOR YOUR PROTECTION 2
- READ THE FOLLOWING: 2
- IMPORTANT SAFETY INSTRUCTIONS 2
- DECLARATION OF CONFORMITY 3
- SAFETY INSTRUCTIONS 3
- Warranty 4
- Table of Contents 5
- Overview 6
- Features 7
- Front Panel 8
- 9. INPUT Meters 9
- 10. CLIP LEDs 9
- 11. OUTPUT Meters 9
- 12. TH (THRESHOLD) Meters 9
- 13. MUTE Buttons 9
- Rear Panel 10
- 6. Input Switches 11
- Installation Recommendations 12
- Making Connections 12
- Applying Power 14
- Getting Started 15
- Operating Modes Explained 16
- The Home Screens 17
- Using The Wizards 18
- AutoEQ Mic Position 2 19
- Amp clips 12 dB 24
- Both amp and mixer 24
- Operating The DriveRack PA2 28
- Managing Presets 29
- Graphic EQ (GEQ) 31
- BAND(1-8) Q [0.1 - 15.909] 34
- LIVE LIFT [ON, OFF] 38
- LIFT AFTER [5S - 60M] 38
- SELECTED FILTER [1 - 12] 38
- -40 -24 -12 -6 0 39
- 30 12 5 0 41
- GAIN [-20 dBu to +20 dBu] 42
- OVEREASY [OFF, 1-10] 42
- DELAY [ON, OFF] 44
- Crossover (XOVER) 45
- POLARITY [NORMAL, INVERTED] 46
- LIMITER [ON, OFF] 47
- Power-Up Functions 51
- System Lockout 52
- Factory Reset 53
- Soft Reset 53
- Application Guide 54
- 120V 50/60Hz 55
- 3-Way Application 58
- Preset List 59
- Device Requirements 60
- Networking 61
- 5� Software Firewall 62
- Technical Information 63
- DSP Block Diagram 64
- Cable Diagrams 65
- Audio Cable Diagrams 66
- Dimensions 67
- Specifications 68
- Additional Resources 69
Produits connexes et manuels pour Équipement musical Dbx DriveRack PA2
(48 pages)© 2020, manymanuals.fr. Tous droits réservés | 1.957 s |
Manymanuals.com
Manymanuals.de
Manymanuals.fr
Manymanuals.it
Manymanuals.pl
Manymanuals.cz
Manymanuals.es
Manymanuals-pt.com
Commentaires sur ces manuels