dbx Pro QUANTUM user manual Detailed Parameters Section Multiband Compression

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QUANTUM

Detailed Parameters Section 4

4.1 Multiband Compression (cont.)

Threshold -60 to 0 dB (per band or global)

Threshold is the signal level at which the QUANTUM starts to compress. If the threshold is set to -10 dBFS, then any signal larger than -10 dBFS is compressed, while any signal that has a level lower than -10dBFS is left at the same level. Light compression is where only the largest parts of the signal go over the threshold. Very heavy compression can be achieved by setting the threshold low enough so that almost the entire signal content is over the threshold. For most signals, the most natural compression is achieved when most of the signal content remains just below the threshold and only the peaks cross the threshold.

Ratio 0.75 to Inf:1 (per band or global)

Ratio is the amount the QUANTUM reduces the signal level of the sound that is above the threshold. A 2:1 ratio means that if the incoming signal is 2dB over the threshold the QUAN- TUM will compress the signal, and outputs a signal that only goes 1dB over the threshold. For light compression choose a lower ratio. For heavy compression a higher ratio is used. By set- ting the ratio at less than 1:1, the signal will be expanded rather than compressed. The QUAN- TUM will actually output a signal larger then the input. At a ratio of 0.75:1, if a signal goes over the threshold by 0.75dB the unit will output a signal that is 1 dB over the threshold.

Gain -20 to +20 dB (per band or global)

This is used to compensate for the gain lost during compression. By using heavy compression on a signal and then boosting the signal with the output gain we can than create a signal that sounds much louder than it was.

Attack 0.1 m Sec to 200 m Sec (per band or global)

Attack is how fast the compressor starts to compress the signal after it passes the threshold. Fast attack is useful when dealing with lots of fast transients. The attack control is not active when in auto mode.

Hold 0 to 500 m Sec (per band or global)

Hold is the time the QUANTUM remains in compression after the signal has dropped below the threshold. A longer hold time is useful in smoothing out the sound when compressing several fast peaks that are fairly close together in time. In general, some hold time helps to make the compression sound more natural but too much can over compress your signal making for an unwanted drop in level. The hold control is not active while in auto mode.

Release 360 dB / Sec to 5 dB / Sec (per band or global)

Release is how fast the QUANTUM comes out of compression. The release is in dB per second. For example, if release is set to 5 dB /sec, signal at 10dB of gain reduction, release time is 2 seconds. Too fast a release time can result in an audible volume jump, while too slow a release time can result in the compression of a signal that is not above the threshold. This can cause volume drops in your signal that may not be desired. The release control is not active while in auto mode.

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Contents Quantum Important Safety Instructions Declaration Conformity Quantum Table of ContentsFigure Index Page Intro Introduction What is QUANTUM?Warranty Introduction What is QUANTUM?Service Contact Info Quantum Section Front Panel Getting StartedRear Panel Connections Getting Started Section Front Panel Quantum Wizard Signal PathGetting Started Section Mastering and the Quantum Quantum is a Mastering Processor that has many featuresQuantum Navigation Multiband Compressor NavigationNavigation Section Broadband Compressor Navigating the Broadband CompressorMultiband Gate Navigating the Multiband GateNavigation Section Broadband Gate Navigating the Broadband GateMultiband Limiter Navigating the Multiband LimiterNavigation Section Broadband Limiter Navigating theBroadband LimiterEQ/XOver Navigating the Multiband EQ/XOverNavigation Section EQ/SEQ Navigating the Broadband EQ/SEQNorm/Output Navigating Norm/OutputNavigation Section Other Navigating OtherUtility Navigating UtilitySection FX Chains Software OperationsChain Type Stereo Broadband Software Operations Section FX ChainsMono Input CH1 or CH2 Chain Type MonoProgram Pop Master Software Operations Section Programs/SetupsSection Saving a SetupSaving a Program Software Operations Section Saving a SetupReplace Old Store NewMeters Bypass FunctionAnalog Meters TSE Level MetersDigital Meters Software Operations Section MetersMeter Options CompressorLimiter Monitor OutputsGate / Expander De-EsserDetailed Multiband Compression Detailed ParametersDetailed Parameters Section Multiband Compression Broadband Compression Detailed Parameters Section Broadband Compression Attack 0.1 to 200 m Sec per band or global Ratio 11.0 to 115 per band or globalRelease 360 to 5 dB / Sec per band or global Max ATT 0 to Inf. dB per band or globalMultiband Limiting Detailed Parameters Section Broadband GateAttack .01 to 200 m Sec per band or global Broadband LimitingLimiter On/Off Type PkStop+/RMSEQ On/Off Detailed Parameters Section Broadband LimitingPOS Pre/Post Type Const Q / Adapt QXOver Schain EQ On/Off Detailed Parameters Section SEQSEQ1 FC 20.0 Hz to 20.0 kHz SEQ2, 3, 4 FC 20.0 Hz to 20.0 kHzType Stereo AdjustDe-Esser Detailed Parameters Section Ambience13 TCM Output NormalizationDither Out All or Digital Detailed Parameters Section OutputShaping S1 or S2 Page Utilities Input Output UtilitiesMidi CC Map Utilities Section OutputDigital Input Controls Midi Channels Setup Sysex DataMidi Program Changes Sysex DumpMisc Utilities Section Setup Sysex DataA/D Calibrate Page Guide Analog Mastering Application GuideHardware SoftwareApplication Guide Section Digital Mastering DAW to DAT 586 Application Guide Section Analog TrackingDigital Tracking Application Guide Section Analog Mixing Digital Mixing Application Guide Section Analog to Digital Converter Sample Rate Converter QUANTUMAppendix Change Default Startup Program Hard & Soft ResetsAppendix a Miscellaneous Information Front Panel LockoutTypeIV White Paper Appendix B By Roger JohnsonConverted Level vs. Input Level Appendix B TypeIV White PaperType Amplitude Time Clip Level High-Frequency Information Completely Lost Clock Modes Appendix C Midi Clock InfoFig. C.1 Quantum Sync InputFig. C.2 Appendix C Miscellaneous Clock InfoRequest One Setup 02h ProceduresReceive One Setup 43h Sysex Definitions Appendix DAppendix D Sysex Definitions Sysex Setup Dump Sample Reset Device 21hProcedure Setup Dump Version Setup Type and Setup NumberMidi CC MultiBand Chains Appendix E Midi CC TablesMidi CC Stereo Non-MultiBand Midi CC Tables Appendix E Midi CC MultiBand ChainsMidi CC Stereo Non-Multiband Midi CC Dual Mono ChainsMidi CC Tables Appendix E Midi CC Dual Mono Chains Factory Programs Appendix F Factory PresetsMono Factory SetupsStereo Specifications Appendix G SpecificationsAppendix H Appendix H Quantum Harman International Company
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