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22

DAC Inputs

THD+N

0.0028%

THD+N @ 1kHz

0.0025%

IMD CCIF (1 V

rms

output)

0.00115%

IMD CCIF (5 V

rms

output)

0.00223%

IMD SMPTE (1 V

rms

output)

0.00025%

Noise (unweighted
20Hz~22kHz, balanced 47
ohm load, high gain)

-91.7dB

Noise (unweighted
20Hz~22kHz, balanced 47
ohm load, low gain)

-96.1dB

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Summary of Contents for 38967

Page 1: ...Liquid Gold X Balanced Headphone Amplifier and DAC by Alex Cavalli P N 38967 User s Manual ...

Page 2: ... unplug it from the power outlet and allow it to fully dry before reapplying power Do not touch the device the power cord or any other connected cables with wet hands Do not expose this device to excessive vibration Do not subject the product to extreme force shock or fluctuations in temperature or humidity Do not expose this device to excessively high temperatures Do not place it in on or near a ...

Page 3: ...ysical damage has occurred Before plugging the unit into a power outlet ensure that the outlet provides the same type and level of power required by the device Do not use any AC power adapter other than the one provided with the unit The adapter is closely matched with the MCU to provide the proper high current influx when power is applied Use of aftermarket power adapters is likely to damage the ...

Page 4: ...the connector head or adapter body Ensure that power is turned off and disconnected before making any electrical connections Clean using a soft dry cloth only Do not use chemical cleaners solvents or detergents For stubborn deposits moisten the cloth with warm water This device has no user serviceable parts Do not attempt to open service or modify this device ...

Page 5: ...ed 1 4 TRS output The TRS output is provided for compatibility with TRS terminated headphones but it is recommended to use the amp in fully balanced mode using balanced headphones The amp has both balanced XLR and unbalanced RCA inputs The unbalanced input has an internal solid state buffered phase splitter to create a balanced signal and drive the amp fully balanced The Monolith Liquid Gold X amp...

Page 6: ...price Customer Service representative through the Live Chat link on our website www monoprice com or via email at support monoprice com Check the website for support times and links PACKAGE CONTENTS Please take an inventory of the package contents to ensure you have all the items listed below If anything is missing or damaged please contact Monoprice Customer Service for a replacement 1x Monolith ...

Page 7: ... LED illuminates or blinks red and or white to indicate a normal operating or fault condition Refer to the table in the BLINK CODES section for details 5 GAIN This toggle button determines the amount of gain to apply to the signal When the button is IN the gain is 6x and when it is OUT the gain is 4x 6 VOLUME Turn the knob clockwise to increase the volume level and counterclockwise to decrease the...

Page 8: ...on to cycle through the inputs When power is first connected the input defaults to the balanced XLR input The cycle order is Balanced XLR Unbalanced RCA and DAC then back to Balanced XLR 9 DAC LEDs The three LEDs indicate which DAC input is selected From top to bottom they indicate USB Coaxial and Optical 10 INPUT LEDs The three LEDs indicate which input is selected From top to bottom they indicat...

Page 9: ...inputs 13 USB USB digital audio DAC input 14 COAX Coaxial digital audio DAC input 15 OPTICAL Optical digital audio DAC input 16 AUTO OFF This switch enables or disables the auto off feature 17 POWER DC barrel connector for connecting the included AC power adapter ...

Page 10: ...0 1 sec on 0 1 sec off 75 times DC Offset Failure Blinks red 0 1 sec on 0 1 sec off 75 times EU Shutdown Final Minute Blinks white 1 sec on 1 sec off 30 times DC Module Wrong Voltage Blinks red and white alternately 1 sec on 1 sec off 8 times Firmware Unknown State Blinks red and white alternately 3 sec on 3 sec off 5 time ...

Page 11: ...th various colors and blink rates Refer to the BLINK CODES section for details Please review this section before attempting to operate the Monolith Liquid Gold X amplifier DC Plug In Delay The Monolith Liquid Gold X amplifier has several built in delays to ensure that all DC voltages are in their proper ranges before allowing you to power up and connect headphones The first important delay is imme...

Page 12: ...at the amplifier is ready for operation Ground Test Delay The MCU will wait for about 3 seconds and then measure all of the important internal ground relationships If these are not within acceptable range the MCU will power down the amp and show a ground failure blink code If this failure occurs mulitiple times please contact Monoprice Technical Support for assistance DC Offset Delay If the ground...

Page 13: ...d setting the volume level to minimum during power on After the STATUS LED changes from red to white and the headphones are connected all normal amp features should be operational EU Compliant Auto Shutdown To comply with EU Regulation EC No 1275 2008 this amplifier features an auto off function which is enabled or disabled using the AUTO OFF switch on the rear panel When the switch is placed in t...

Page 14: ...isplayed the timer will reset DC Offset or Ground Fault if the MCU detects either of these two conditions during operation it will disconnect the headphones and the STATUS LED will change from white to red If either condition is an extreme failure the MCU will also shut down the amplifier with the associated blink code If the either condition is deemed abnormal but not extreme the MCU will attempt...

Page 15: ...s please contact Monoprice Technical Support for assistance OPERATING GUIDELINES To get the most out of your amplifier and to protect it from possible damage follow the guidelines listed below Gain Setting While the amplifier supports hot switching the gain setting changing gain introduces a small DC transient at the output Depending on the sensitivity of your headphones this transient might be qu...

Page 16: ... into the jack For best results and the safest operation turn the amplifier off before plugging or unplugging your headphones Electrical Connections You should power down the amplifier and unplug it from the power source before making any electrical connections including the inputs and the headphone outputs This ensures that no transient voltage spike can occur which can cause damage to the amplif...

Page 17: ... no headphones connected and the volume set to about 10 o clock Constant On Other than the aforementioned break in period the amplifier should be powered down when not in use to ensure the longest possible life for the components Balanced vs Unbalanced To get the best performance from your amplifier use the balanced headphone output as well as the balanced XLR inputs The amp is designed to run wit...

Page 18: ... your location Aftermarket AC Power Adapters The AC power adapter is matched to the onboard power control circuit A particular feature of this matching is to control the high current influx when DC power is plugged in and when the amp is turned on Therefore DO NOT USE AFTERMARKET LINEAR SUPPLIES AS THEY ARE VERY LIKELY TO DAMAGE YOUR AMPLIFIER Grounding This amplifier shares the ground of the sour...

Page 19: ...nline to talk to one of our friendly and knowledgeable Tech Support Associates Technical support is available through the online chat button on our website www monoprice com or through email by sending a message to tech monoprice com Check the website for support times and links SPECIFICATIONS General Model 38967 Frequency Response 5 Hz 60 kHz 0 05dB Maximum Output Balanced voltage for 1 THD Watts...

Page 20: ...hms 1 109 7 88 150 Ohms 0 448 8 20 300 Ohms 0 231 8 32 Crosstalk 1kHz 1 Vrms input unit gain balanced in out 88dB Channel Balance with pot at unit gain balanced out 0 1dB Input Power 36 VDC 1 4A AC Adapter Input Power 100 240 VAC 50 60 Hz Dimensions 8 7 x 8 5 x 2 0 222 x 216 x 51 mm Weight 3 3 lbs 1 5 kg ...

Page 21: ...utput 0 00025 Noise unweighted 20Hz 22kHz balanced 47 ohm load high gain 101dB Noise unweighted 20Hz 22kHz balanced 47 ohm load low gain 103dB Noise relative to 1 Vrms single ended low gain 102dB Noise relative to 1 Vrms single ended high gain 99dB Output Impedance balanced 0 133567 ohms Output Impedance unbalanced 0 173573 ohms ...

Page 22: ...kHz 0 0025 IMD CCIF 1 Vrms output 0 00115 IMD CCIF 5 Vrms output 0 00223 IMD SMPTE 1 Vrms output 0 00025 Noise unweighted 20Hz 22kHz balanced 47 ohm load high gain 91 7dB Noise unweighted 20Hz 22kHz balanced 47 ohm load low gain 96 1dB ...

Page 23: ...ht to use the equipment may be limited by FCC regulations and you may be required to correct any interference to radio or television communications at your own expense This equipment has been tested and found to comply with the limits for a Class B digital device pursuant to Part 15 of the FCC Rules These limits are designed to provide reasonable protection against harmful interference in a reside...

Page 24: ...measures Reorient or relocate the receiving antenna Increase the separation between the equipment and receiver Connect the equipment into an outlet on a circuit different from that to which the receiver is connected Consult the dealer or an experienced radio TV technician for help Notice for Industry Canada This Class B digital apparatus complies with Canadian ICES 003 Cet appareil numérique de la...

Page 25: ...967 or the CE DoC can be found within this user manual EMC Directive 2004 108 EC Low Voltage Directive 2014 35 EU RoHS2 Directive 2011 65 EU WEEE Directive 2012 19 EC Packaging Packaging Waste Directive 94 62 EC REACH Directive 1907 2006 EC WEEE Information User information for consumer products covered by EU Directive 2012 19 EU on Waste Electric and Electronic Equipment WEEE This document contai...

Page 26: ...ld be disposed of separately from regular household waste streams It is your responsibility to dispose of this and other electrical and electronics products via designated collection facilities appointed by the government or local authorities Correct disposal and recycling will help prevent potential negative consequences to the environment and human health For more detailed information about the ...

Page 27: ...cal storm There may be a remote risk of electric shock from the surge caused by lightning WARNING The external power adapter or AC power cord is the equipment s disconnection device The power outlet must be located nearby the equipment and its access must be easy Monoprice Monolith all Monoprice logos and the Monolith logo are trademarks of Monoprice Inc NEMA is a registered trademark of National ...

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