Sound Performance Lab Loudness Maximizer 9632 Owner's Manual

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Loudness Maximizer

Model 9632

Digital D ynamics Processor

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Page 1 Manual Loudness Maximizer Model 9632 Digital D ynamics Processor...
Page 2 Version 3.1 – 9/1999 The information in this document has been carefully verified and is assumed to be correct. However Sound Performance Lab (SPL) reserves the right to modify the product described in this manual at any time. Changes without notice.
Page 3: Table Of Contents
Loudness Maximizer. We wish you every success with your new Loudness Maximizer. Your Sound Performance Lab-Team I would like to start with my thanks to all our staff, who created what is to be described here. Special thanks go to Jörg Houpert, Jörg Mayer, Andreas Skäbe and Klaus-Peter Webersinke from...
Page 4: Introduction
Introduction Maximizing the subjective loudness without sound colo- ration A „look ahead“-signal analysis computes data for most unobstrusive limiting and compressing. Easy and intuitive operation SPL’s digital audio processors are designed in cooperation with Spectral Design of Bremen, Germany, who are responsible for the DSP programming.
Page 5: Operation Safety
Indications and Metering: The Loudness Maximizer is equipped with PPM meters for input and output that show the signal level with maximum resolution (0.01dB) just before 0dB. The Signal LED is the first LED in each PPM meter that lights up when a digital source is present at the inputs The Possible LED chain represents the first device to show how much subjective loudness can be gained.
Page 6: Connections
Connections Before connecting the Loudness Maximizer switch the power off at all connected units. The rear panel provides AES/EBU- and S/P-DIF-inputs and outputs. Any additional channel, status and user-bits are passed through unaltered, and the outputs can be used at the same time if required.
Page 7: Quick Start
All controls are in the start-off positions: DESIRED GAIN 0; SOFT-HARD -9; MORE DENSITY 0. 1. Press ACTIVE. LED illuminates. 2. Watch the Possible LED chain and adjust the shown value with the DESIRED GAIN (for most unobstrusive operation the Possible LED chain should not show negative values.
Page 8: Control Elements
Control Elements Active Relay hard-bypass for AES/EBU input and output Desired Gain Adjusting the desired increase in loudness The ACTIVE function switches the Loudness Maximizer on or off. The illuminated LED indicates that the processing has been activated. The software bypass also compensates for the 5ms time delay between processed and unprocessed signal.
Page 9: Soft-Hard
You can gain more loudness and also start to manipulate sound when you choose other than the initial settings for SOFT-HARD (see 3) or MORE DENSITY (see 4). After having changed these parameters a readjustment of the DESIRED GAIN is mostly advis- able.
Page 10: More Density
More Density How do I restore output gain when heavy compression (MORE DENSITY) is applied? Boost LC-Display With the MORE DENSITY control you can change the principle behaviour of the control loop of the Loudness Maximizer. This parameter describes the Compressor-to-Limiter proportion. In addition, internal rules and algorithms will be changed, too.
Page 11: Led Chains
The Input and Output LED chains are PPM (peak level) meters. By evaluating both LED chains an approximated effective loudness increase can be estimated. The LED chains have a very fine resolution before 0dB. The 0dB position is actually showing 0.01dB which represents the last possible output value of the Loudness Maximizer.
Page 12: Presets
Presets Storing a preset: Depress Store for1 sec. – LED flashes; use Up/Down to select preset number; depress Store again – LED goes out, preset is stored Applying a preset: Depress Apply for1 sec – LED flashes; use Up/Down to select preset number;...
Page 13 1. Software version and date 2.Selecting inputs: The Loudness Maximizer automatically searches for an input signal. If both inputs are connected the AES/EBU input will be selected first. If you want to select the S/P-DIF input you have to call up the INFO pages: AES/EBU input detected.
Page 14 Info no S/P-DIF input detected. Press APPLY (if S/P-DIF is detected): S/P-DIF input with wordclock detected. S/P-DIF input with wordclock detected. 3. Displaying the detected sample frequency: The Sample Frequency will be detected automatically. The display either shows 44,1 kHz, 48 kHz or 32 kHz. 4.
Page 15 6. Displaying the Channel Difference Error flag: No = no error detected; Yes = error detected. 7. Setting or erasing the Copy-Prohibit flag: No = flag erased or not set; Yes = flag set. Pressing APPLY switches off a set Copy-Prohibit flag. It is not possible to set a Copy-Prohibit flag, if there is no Copy Prohibit flag in the processed data.
Page 16 Info 11. Selecting a MIDI channel: Depress APPLY to step from channel 01 up to channel 16. In order to increase operation safety only send the necessary MIDI data to the Loudness Maximizer. Unnecessary information might lead to system failure. You can use MIDI to create a MIDI fade out, if you are working with a digital console that does not provide master inserts.The Up and Down LEDs illuminate indicating that a volume change...
Page 17 Adjusted output levels will be stored and will be active the next time you boot the Loudness Maximizer. If you recognize that your unit does not maximize to full scale, please check the Output Level parameter first. The Output Level attenuation is not shown in the Output PPM meters! Tip: The Output Level should only be used where the output signal should permanently be lower than 0dB.
Page 18: Specifications
Specifications Input/Output Sample rate frequency 32-48 kHz, automatic detection AES/EBU, twisted pair (1), AES 3 AES/EBU in- & output impedance: 110 Ohms S/P-DIF, co-axial (2), SPDIF-2 S/P-DIF input impedance: 75 Ohms Wordclock In/Through, co-axial, BNC Wordclock in-/output impedance: 75 Ohms MIDI In/Through: yes RS 232 (PC): yes RS 422 (MAC, max +/- 14 V): yes...
Page 19: Warranty
SPL electronics GmbH (hereafter called SPL) products are warranted only in the country where purchased, through the authorized SPL distributor in that country, against defects in material or workmanship. The specific period of this limited warranty shall be that which is described to the original retail purchaser by the authorized SPL dealer or distributor at the time of purchase.