dbx 386 Operation & User’s Manual

Text of dbx 386 User Guide:

• ® Introduction 386 386 User Manual If you require technical support, contact dbx Customer Service. Be prepared to accurately describe the problem. Know the serial number of your unit - this is printed on a sticker attached to the rear panel. If you have not already taken the time to fill out your warranty registration card and send it in, please do so now.

• dbx 386, ® Rear Panel Connections • Connect the source to the desired 1/4” TRS or XLR input jack. • Connect the AES/EBU or S/PDIF output of the 386 and run into the AES/EBU or S/PDIF input of the digital mixer. Front Panel Digital Output Features 1). Use the METER switch to select digital output metering. 2). Use the DITHER switch to select the desired dither algorithm. 3). Use the SHAPE switch to select the desired noise-shaping algorithm. 4). Use the SAMPLE RATE switch to select the correct sampling rate. 5). Use the WORD LE

• dbx 386, ® Rear Panel Connections • Connect the source to the desired 1/4” TRS or XLR input jack. • Connect the AES/EBU or S/PDIF output of the 386 and run into the AES/EBU or S/PDIF input of the digital mixer. Front Panel Digital Output Features 1). Use the METER switch to select digital output metering. 2). Use the DITHER switch to select the desired dither algorithm. 3). Use the SHAPE switch to select the desired noise-shaping algorithm. 4). Use the SAMPLE RATE switch to select the correct s

• dbx 386, U.K. MAINS PLUG WARNING A molded mains plug that has been cut off from the cord is unsafe. Discard the mains plug at a suitable disposal facility. NEVER UNDER ANY CIRCUMSTANCES SHOULD YOU INSERT A DAMAGED OR CUT MAINS PLUG INTO A 13 AMP POWER SOCKET. Do not use the mains plug without the fuse cover in place. Replacement fuse covers can be obtained from your local retailer. Replacement fuses are 13 amps and MUST be ASTA approved to BS1362. LITHIUM BATTERY WARNING CAUTION! This product may contain a lithium battery.Th

• dbx 386, Digital Applications ® 14 Section 3 386 Rear Panel Connections • Connect the source to the desired 1/4” TRS or XLR input. • Connect the AES/EBU or S/PDIF output of the 386 and run into the AES/EBU or S/PDIF input interface of the DAW (CPU). Front Panel Digital Output Features 1). Use the METER switch to select digital output metering. 2). Use the DITHER switch to select the desired dither algorithm. 3). Use the SHAPE switch to select the desired noise-shaping algorithm. 4). Use the SAMPLE RATE switch to select the correct sampling rate. 5). Use the WORD LENGTH switch to select the correct word length. 6). Use the OUTP

• dbx 386, ® Figure 3b - Signal of Fig. 3a Going Beyond the A/D Clip Level Amplitude Time A/D Clip Level A/D Clip Level Figure 3a - Signal Having Low and High Frequency Content Amplitude Time Type IV™ White Paper Appendix C 386 23 386 User Manual

• dbx 386, WARNING FOR YOUR PROTECTION PLEASE READ THE FOLLOWING: KEEP THESE INSTRUCTIONS HEED ALL WARNINGS FOLLOW ALL INSTRUCTIONS CLEAN ONLY WITH A DAMP CLOTH. DO NOT BLOCK ANY OF THE VENTILATION OPENINGS. INSTALL IN ACCORDANCE WITH THE MANUFACTURERS INSTRUCTIONS. DO NOT INSTALL NEAR ANY HEAT SOURCES SUCH AS RADIATORS, HEAT REGISTERS, STOVES; OR OTHER APPARATUS (INCLUDING AMPLIFIERS) THAT PRODUCE HEAT. ONLY USE ATTACHMENTS/ACCESSORIES SPECIFIED BY THE MAN- UFACTURER. UNPLUG THIS APPARATUS DURING LIGHTNIN

• dbx 386, Appendix ® 26 Appendix D 386 Microphone Input Connector: Female XLR Pin 2 Hot Type: Electronically balanced/unbalanced Impedance: 330Ω Maximum Input Level: -9 dBu or +11 dBu with 20 dB pad engaged CMRR: >40dB, Typically 55dB Equivalent Input Noise: Typically -120 dBu with a 150Ω source load, 20Hz to 20kHz BW Line Input (Rear Panel) Connector: TRS 1/4" Jack Type: Electronically balanced/unbalanced Impedance: 20kΩ unbalanced, 40kΩ balanced Maximum Input Level: +21dBu balanced or unbalanced CMRR: >40dB, Typically 55dB Gain (Drive Control) -15dB to +15dB Instrument Input (Front Panel) Connector: TS 1/4" Jack Type: Unbal

• dbx 386, Introduction ® 386 User Manual i 386 Congratulations on your purchase of the dbx 386 Dual Vacuum Tube Preamp with digital out- put capabilities. For over 25 years, dbx has been the industry leader in dynamics processing. With the introduction of the 386, we offer the classic smooth and warmth qualities of tube microphone pre-amplification, combined with the state-of-the-art proprietary dbx Type IV™ conversion system to offer the best characteristics of both analog and digital recording capabil- ities. This manual will be your guide to understanding the ful

• dbx 386, ® to-noise performance since the signal is now closer to the noise floor. Because users of digital equipment have to be extremely careful not to exceed 0 dB FS (full-scale), they must use peak-reading headroom meters. On the other hand, the forgiving nature of analog tape allows users of analog recording equipment the luxury of only needing to monitor the average level using VU meters, often having no peak indicators whatsoever. If only digital were more forgiving like analog, we could really exploit its wide dynamic range and more completely capture the essence of the musical perfor- mance. Enter the dbx Type IV™ Conversion System. Like its related predecessor technologies—Type I�

• dbx 386, Introduction ® 386 User Manual iii 386 Install the 386 in your rack with the provided rack screws. It is essential that when the 386 is being mounted in a rack mounting enclosure, the unit should be positioned with enough room (at least one centimeter at the top and one centimeter at the bottom of the unit) to allow prop- er ventilation. The 386 should not be mounted above or below anything that generates exces- sive heat. Ambient temperatures should not exceed 113 0 F (45 0 C) when equipment is in use. Although the unit is shielded against radio frequency and electromagnetic interference, extreme- ly high fields of RF and EMI should be avoided where possible. 0.4 Installatio

• dbx 386, Table of Contents 386 Introduction 0.1 Defining the 386................................................i 0.2 Service Contact Info.........................................ii 0.3 Warranty............................................................ii 0.4 Installation Recommendations........................iii Section 1 - Getting Started 1.1 Rear Panel Connections...................................2 1.2 Front Panel Connections..................................3 1.3 Type IV™ Conversion System Controls..........4 Section 2 - Analog Applications 2.1 Basic Connection..............................................6 2.2 Connect

• Digital Applications ® 16 Section 3 386 The 386 gives you the unique option of utilizing the analog and digital outputs simultaneously. This option is ideal for using the analog output section as a reference monitoring signal of the dig- ital signal. Both analog and digital outputs offer independent output control, which allows you to send a digital signal to a receiving device (such as a

• dbx 386, ® Microphone Input +48V Low 20dB Pad Phase Invert Low Cut dbx TYPE IV Conversion System DSP Dither Sample Rate Word Length Output Format Shape Peak LED Line/Mic 12AU7 Tube Drive Analog Output Level Analog Outputs Digital Output Level Rear Panel Line Input Front Panel Instrument Input Bargraph Meter Analog Digital + - Insert dbx Pulsar Chip Word - In Word - Out S/PDIF Output AES/EBU Output Block Diagram Block Diagram Appendix B 386 19 386 User Manual

• Type IV™ White Paper ® 22 Appendix C 386 Fig. 2 illustrates the mapping function in a different way. Input levels are shown on the left of the graph, while con- verted levels are shown on the right. Notice the mapping of large signal excursions to the 4 dB “Type IV™ Over Region.” One might question the validity of such an approach—trying to represent a lot of signal in

• dbx 386, Getting Started ® 386 User Manual 2 Section 1 386 Power Switch Turns the 386 on and off. IEC Power Cord Receptacle This is the power cord receptacle of the 386. An IEC cord is included with the shipped prod- uct. AES/EBU Digital Connector The 386 provides AES/EBU digital output formating through the XLR connector. Be sure to use short lengths of 110Ω digital cables rather than standard XLR to XLR cables. Using the correct cables will prevent digital dropouts and other interconnection problems. S/PDIF Digital Connector The 386 provides S/PDIF digital output formating through the RCA coaxial connector. Be sure to

• Analog Applications ® 3386 User Manual 6 Section 2 386 • Turn off all equipment before making any connections. • Install the 386 in your rack with the provided rack screws. It is essential that when the 386 is being mounted in a rack mounting enclosure, the unit should be positioned with enough room (at least one centimeter at the top and one centimeter at the bottom

• dbx 386, ® 16-Bit TPDF dither. (a) Shape “off”, (b) with shape set to “S1”, (c) with shape set to “S2.” Parameters: Input -60dBFS, 1 kHz; FFT Length= 2048, Sample Rate= 48 Khz, Averages= 32; Graph Steps= 1024. (a) 24-Bit word, (b) 16-Bit truncated output, no dither. Parameters: Input -60dBFS, 1 kHz; FFT Length= 2048, Sample Rate= 48 Khz, Averages= 32; Graph Steps= 1024. . D.2 D.2 Truncation D.1 D.1 Noise-Shaping Algorithms Appendix Appendix D 386 25 386 User Manual

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