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dbx Pro 386 Section, Front Panel Type IV conversion system controls, Meter Select Switch

Models: 386

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Section 1

Section 1	Getting Started	386
	Getting Started

Meter Select Switch

This switch allows you to select display metering of either the digital or analog output signal. The analog level is scaled in dBu, while the digital level is scaled in dBFS.

LightPipe™ Meter

This meter displays either the analog or digital output signal.

Digital Output

This knob controls the signal being sent to the A/D Converter, and ranges from -15 to +15dB.

1.3 Front Panel (Type IV™ conversion system controls)

Dither Switch

This switch is used to select the dither type algorithms including: TPDF, SNR2 , or None. Dither is random noise that is added to the audio signal which effectively eliminates the harmonic dis- tortion created by truncation. See the “Truncation” graph in section D.2 of the Appendix. The LED will be lit RED for the SNR2 or GREEN for the TPDF dither algorithm. When the LED is off, dithering is not in use.

Shape Switch

This switch selects either the Shape 1 or Shape 2 psycho-acoustic noise-shaping curve. Shape 1 utilizes a mild psycho-acoustic curve, while the curve used in Shape 2 tends to be more aggressive. Please see the "Noise Shaping" graph in section D.1 of the Appendix. The LED will light GREEN for Shape 1 and RED for Shape 2. When the LED is off, the noise-shaping effect is not in use.

Sample Rate Switch

This switch selects the digital output sample rate of either: 44.1, 48, 88.2, or 96 kHz. The LED will not be lit for 44.1 kHz, GREEN for 48 kHz, RED for 88.2 kHz and YELLOW for 96 kHz.

Word Length Switch

Selects output wordlength of 16, 20, or 24 bits output resolution. The LED will not be lit for 16 bit, GREEN for 20 bit, and RED for 24 bit.

Output Format

Selects the AES/EBU or S/PDIF digital output format. The LED will be lit red for AES/EBU and green for S/PDIF.

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4	386 User Manual

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dbx Pro 386 Section, Front Panel Type IV conversion system controls, Meter Select Switch, LightPipe Meter, Digital Output

Contents

Tube Preamp Dual Vacuumw/Digital Out User ManualIMPORTANT SAFETY INSTRUCTIONS SAFETY INSTRUCTIONSWIRE COLOR CLEAN ONLY WITH A DAMP CLOTHLITHIUM BATTERY ELECTROMAGNETIC COMPATIBILITYU.K. MAINS PLUG WARNING ADVARSELTable of Contents Table of Contents 386 User ManualIntroduction Section 1 - Getting Started386 DEFINED INTRODUCTIONWARRANTY INFO CUSTOMER SERVICE INFOIntroduction 0.1 Defining theSelectable mic/line switch 48 volt phantom power 20 dB pad 75 Hz low cut filter Phase reverse0.2 Service Contact Info 0.3 WarrantyIf 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 Introduction0.4 Installation Recommendations 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 1130F 450C 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 possibleIntroduction 386 User ManualSection GettingStarted Getting StartedPower Switch IEC Power Cord ReceptacleAES/EBU Digital Connector S/PDIF Digital ConnectorLine Select Switch +48 Volt Switch20db Pad Switch Phase SwitchMeter Select Switch Dither SwitchShape Switch Sample Rate SwitchAPPLICATIONS ANALOG APPLICATIONSANALOG SectionAnalog Applications 2.1 Basic Analog Connection of the2.2 Connection to a Mixing Console Section2.3 Direct Connection to a Recorder SectionAnalog Applications 1. Make microphone connections, being careful to keep the DRIVE control in the minimum +30 dB positionPage DIGITAL APPLICATIONS DIGITALSection APPLICATIONSDigital Applications 3.1 Digital Output Front Functions of the 3.2 Digital Output Rear Panel ConnectionsDither Switch Shape SwitchDigital Applications 3.3 Sync Input Sample Rate SelectionAES/EBU Digital Connector S/PDIF Digital ConnectorFront Panel Digital Output Features 3.4 Direct Connection to a DAW CPURear Panel Connections SectionSection Direct Connection to a Digital MixerFront Panel Digital Output Features Digital ApplicationsDigital Applications 3.6 A/D Conversion Front Panel Digital Output FeaturesSection Rear Panel ConnectionsMulti-Tracking to Digital Front Panel Digital Output FeaturesSection Digital ApplicationsDigital Applications 3.8 Analog and Digital Output Application Front Panel Digital Output FeaturesSection Rear Panel ConnectionsAPPENDIX SpecificationsSync Input Info Block Diagram APPENDIXAppendix A Sync Input InfoSync Input Info 386 User ManualDiagram Appendix B Block DiagramBlock 386 User ManualAppendix C dbx Type IV Conversion System White PaperType IV White Paper by Roger JohnsonAppendix C Type IV White Paper386 User Manual Appendix C Type IV White Paper386 User Manual Figure 3a - Signal Having Low and High Frequency Content Figure 3b - Signal of Fig. 3a Going Beyond the A/D Clip LevelAppendix C Type IV White PaperHigh-Frequency Information Completely Lost High-Frequency Content A/D Clip Level Low-Frequency ContentAppendix C Type IV White PaperAppendix D AppendixD.2 Truncation D.1 Noise-Shaping AlgorithmsD.3 Specifications Appendix DAppendix Questions or comments? Email us at customer@dbxpro.com or visit our World Wide Web home page atA Harman International Company 8760 South Sandy Pkwy Sandy, Utah Phone 801 Fax 801 Int’l Fax 603