Related Manuals for Okto Research dac8 Stereo
Summary of Contents for Okto Research dac8 Stereo
- Page 1 Stereo Highest performance, streaming-enabled stereo D/A converter Owner’s Manual...
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Page 2: Table Of Contents
Displays submenu ..........................17 Filters submenu ............................17 Status submenu............................21 Advanced submenu ..........................21 Using dac8 Stereo streaming capabilities .....................22 Converting non-streaming unit into a streaming one..............23 Mains voltage selection ........................... 24 Troubleshooting ............................24 Issue 1: USB input not recognized ..................... 24 Issue 2: Dropouts during AES/EBU playback ..................25... -
Page 3: Specifications
0.00022 % / -113 dB THD+N @ 100 mW into 32 Ohms headphone output Additional features Designed to directly interface to amplifiers Per-channel volume Choice between 7 PCM reconstruction FIR filters Configurable auto on / auto off 3 | dac8 Stereo Owner’s Manual | okto research... - Page 4 Power Mains voltage: 120 V AC or 230 V AC, according to the mains voltage of the country from which the order was placed, unless requested otherwise Power rating: 15 W 4 | dac8 Stereo Owner’s Manual | okto research...
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Page 5: Mechanical Drawings
Mechanical drawings 5 | dac8 Stereo Owner’s Manual | okto research... -
Page 6: Back Panel Overview
Back panel overview Package contents dac8 Stereo (silver or black depending on your choice, 120 V or 230 V version depending on the country of order) Additionally, for the streaming version: Wi-Fi USB adapter with antenna USB interconnect blank 16 GB microSDHC memory card (inserted in the Raspberry Pi’s slot) -
Page 7: Setting Up
Setting up The dac8 Stereo is compliant with USB Audio Class 2 (UAC2), a widely used digital audio interface standard that enables asynchronous operation. This feature allows the DAC to control data flow according to its own high-precision oscillator, bypassing any requirements for the precision of the clock in the source device or cables. - Page 8 To reduce latency, navigate to the USB driver's control panel, select the "Buffer Settings" tab, and change the buffer size in the dropdown menu. The dac8 Stereo is tested to work with 1.5 ms output latency for playback and 1.67 ms for recording; however, the host computer must be able to provide data in a timely manner to avoid buffer underruns and dropouts during playback.
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Page 9: Analog Connections
Warning: The USB input of the dac8 Stereo may not work correctly when connected to a USB hub or a legacy USB 1.0 port. Be sure to use a USB 2.0 (or newer) port when connecting the unit. Analog Connections... -
Page 10: Driving Power Amplifiers Directly
Stereo volume is set to -12 dB or higher. Consequently, the upper 12 dB of the dac8 Stereo's output would remain unused. By lowering the output voltage of the dac8 Stereo to 1 V, its noise floor could be reduced by 12 dB, preserving the dynamic range. -
Page 11: Headphone Output
Doing so will result in significantly decreased analog performance due to the short they present to the output of the dac8 Stereo's analog stage, potentially overloading it and risking damage after long-term use with high signal levels. Warranty does not apply to units with analog circuitry damaged by using XLR to RCA cables and converters. -
Page 12: Controls
Remote control The dac8 Stereo can be paired with any remote that has a minimum of seven buttons. For a detailed description of the pairing process, please refer to the “System submenu” section. -
Page 13: User Interface And Menu System
192kHz 32bit PCM Play / pause icon: indicates incoming data Input mode indicator: shows selected input Audio data information: displays sample rate, bit depth and data format (relevant to the current input) 13 | dac8 Stereo Owner’s Manual | okto research... -
Page 14: Main Screen, Right
The main menu will appear on the left screen upon pressing the knob, or by pressing the Menu button on the remote control. Volume Inputs Outputs System Displays Filters Status Advanced 14 | dac8 Stereo Owner’s Manual | okto research... -
Page 15: Volume Submenu
Use USB1 / USB2 / Coax1 / Coax2 / Opt1 / Opt2 / AES/EBU: Allows or disallows the respective input to be selected Names: changes displayed name of the two USB inputs USB / Stream USB1 / USB2 (default) 15 | dac8 Stereo Owner’s Manual | okto research... -
Page 16: Outputs Submenu
Auto ON: turns on the unit when incoming signal of non-zero value is detected Auto OFF: turns off the unit after a time period without input signal never 10 min 30 min 2 hrs (default) 16 | dac8 Stereo Owner’s Manual | okto research... -
Page 17: Displays Submenu
After timer: sets display action after the selected timer value expires dim (default) Menu return: sets the time for an automatic return from the menu to the main screen off (default) 10 s 60 s 5 min 17 | dac8 Stereo Owner’s Manual | okto research... -
Page 18: Filters Submenu
Filters submenu PCM filter FRMP DSD filter auto PCM filter: selects FIR filter type for interpolation of PCM-encoded signal FRLP (fast roll-off, linear phase): SRLP (slow roll-off, linear phase): 18 | dac8 Stereo Owner’s Manual | okto research... - Page 19 FRMP (fast roll-off, minimum phase) (default): SRMP (slow roll-off, minimum phase): AFRLP (apodizing, fast roll-off, linear phase): HFRMP (hybrid, fast roll-off, minimum phase): 19 | dac8 Stereo Owner’s Manual | okto research...
- Page 20 BW (brickwall): DSD filter - sets the cut-off frequency of the low-pass filter for DSD playback auto (default) 50 kHz 60 kHz 70 kHz 20 | dac8 Stereo Owner’s Manual | okto research...
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Page 21: Status Submenu
This setting is intended for technically proficient users with access to a high-end audio analyzer. range: -99 to 99 (default: 0) THD h3: same as the previous setting, but for 3 order harmonic distortion range: -99 to 99 (default: 0) 21 | dac8 Stereo Owner’s Manual | okto research... -
Page 22: Using Dac8 Stereo Streaming Capabilities
Using the streaming capabilities If ordered with the streaming option, the dac8 Stereo will come with a built-in Raspberry Pi with a blank memory card, allowing the user to install an audio streaming software of their choice. Please follow these steps to ensure a flawless installation. -
Page 23: Converting Non-Streaming Unit Into A Streaming One
Converting a non-streaming unit into a streaming one The dac8 Stereo is compatible solely with the Raspberry Pi 4 Model B. Any RAM size is sufficient for running streaming audio software, including the legacy 1GB version. However, we recommend checking the compatibility of your intended software with your Raspberry Pi version. -
Page 24: Mains Voltage Selection
This section is designed to help you identify and resolve potential issues that may arise during the use of your dac8 Stereo. If you are unable to resolve an issue following these steps, or if the problem is not listed here, please contact us for further assistance. -
Page 25: Issue 2: Dropouts During Aes/Ebu Playback
We are committed to providing technical support and spare parts to both original and second-hand owners. The dac8 Stereo is designed for maximum reliability, with each unit undergoing extensive testing before shipment. In the unlikely event of spontaneous malfunction, the product is covered by a 2-year warranty. -
Page 26: Manual Revisions
Manual revisions Rev. 1.2 Large number of changes accompanying the release of the v1.2 firmware Rev. 1.1 Small changes, extended XLR-to-RCA disclaimer, mailing address update Rev. 1.0 Initial release 26 | dac8 Stereo Owner’s Manual | okto research...
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