S M S L DO300EX Headphone Amplifier User Manual

: June 16, 2024
: S M S L

Table of Contents

S M S L DO300EX Headphone Amplifier
Product Information
Product Usage Instructions
Safety Notes
Warranty Terms
Features
Speciﬁcations
Remote Control
Parts
Instructions
About MQA
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Download This Manual (PDF format)

S M S L DO300EX Headphone Amplifier

S-M-S-L-DO300EX-Headphone-Amplifier-
product-image

Product Information

Specifications

Model: MQAMQA-CD
DAC: XMOS XU-316PCM32bit/768kHzDSDDSD512 DACAK4191+AK4499EX
THD+N: 0.00006%(-124dB) (UN-WTD)
HPA THD+N: 0.0001%(-120dB) (UN-WTD)
Output Voltage (XLR): 5Vrms
Output Voltage (RCA): 2.5Vrms
Power Output: 2Wx2(16Ω), 1Wx2(32Ω)
XLR Impedance: 200Ω
RCA Impedance: 100Ω
USB Compatibility: Windows 7 / 8 / 8.1 / 10 / 11, Mac OSX10.6, Linux
MQA Decoder: USB / PCM
USB PCM Sampling Rate: 44.1~768kHz (32bit)
DSD Sampling Rate: 2.8224~22.5792MHz (1bit)
DoP: DoP64~DoP256
Supported Codecs: SBC, AAC, aptX, aptX HD, LDAC(24bit/96kHz)

Product Usage Instructions

Connecting the Device

Connect the product to your computer or audio source using the provided USB cable.
If using XLR output, connect the XLR cables to your amplifier or speakers. If using RCA output, connect the RCA cables instead.
Ensure that all connections are secure and properly plugged in.

Using the Product
To use the product:

Turn on your computer or audio source.
Turn on the product by pressing the power button.
Adjust the volume using the volume control knob.
Select the desired input and output settings on your computer or audio source.
Play audio on your computer or audio source to enjoy it through the connected speakers or headphones.

Changing Settings
To change settings:

Access the settings menu on your computer or audio source.
Adjust the desired settings, such as sampling rate or codec selection.
Apply the changes and play audio to experience the updated settings.

Frequently Asked Questions (FAQ)

Q: What is the compatibility of the USB connection?
A: The USB connection is compatible with Windows 7, 8, 8.1, 10, and 11. It also works with Mac OSX10.6 and Linux.
Q: What sampling rates are supported for PCM and DSD?
A: The product supports PCM sampling rates from 44.1kHz to 768kHz (32bit) and DSD sampling rates from 2.8224MHz to 22.5792MHz (1bit).
Q: What codecs are supported by the product?
A: The product supports SBC, AAC, aptX, aptX HD, and LDAC (24bit/96kHz) codecs.

Safety Notes

Install this unit in a well ventilated, cool, dry, clean place-away from direct sunlight, heat sources, vibration, dust, moisture, or cold.
Use the voltage speciﬁed on this unit Only. Using this unit with a higher voltage than speciﬁed is dangerous and may cause ﬁre, damage to this unit, or personal injury. Our company will not be held responsible for any damage resulting from the use of this unit with a voltage other than that speciﬁed.
Do not attempt to modify or ﬁx this unit by yourself. Contact salesperson or customer service when any service is needed. The cabinet should never be opened for any reason.
When not planning to use this unit for long periods of time (i.e. when going on vacation), disconnect the power cable from the AC wall outlet.

Important note:
The product speciﬁcations and information mentioned in this manual are for reference only. The content of this manual is subject to change without notice.

Warranty Terms

The Term of Service
Foshan Shuangmusanlin Technology Co., Ltd promises to oﬀer good-quality products. If the product is broken in 7 days after purchasing when you use it normally, you can choose to send it back for return, replacement or repairing (only the product does not aﬀect the second sales can be returned ). Repairing for free in one year if you use it normally.
Date of purchase is in accordance with the date on invoice or receipt used by seller, and if you buy it on line, you can show the screenshot of trade.
If an inappropriate usage causes the unit damaged, the warranty will be void. As below:
All damages by inappropriate use, including using it under non-normal working environment or without following the instructions.
Dismantling, reﬁtting, repairing by user in private.
Causing damage by using some ﬁttings instead of the designative or accredited ones.
Cannot provide credible proof of purchase.
Sending it back to our company for repairing.
Contact your S.M.S.L Audio reseller for a return or replacement.

Features

Support MQA decoding, support MQA-CD;
New 3rd generation XMOS XU-316, PCM support up to 32bit/768kHz, DSD support to DSD512; Flagship DAC chip AK4191+ AK4499EX, tap all the potential of the chip;
Distortion as low as a staggering 0.00006% (-124dB);
Use 5 high-end dual op amps and a large number of audiophile components;
Adopt 2nd PLL to eliminate JITTER during SPDIF transmission;
The new self-developed CK-03 clock processing circuit greatly reduces clock jitter;
Support DOP independent display function, accurately determine the current decoding format;
USB, optical ﬁber, coaxial , AES, I2S support DSD transmission, coaxial and optical ﬁber support DOP64;
Use tempered glass to fully ﬁt the color IPS display;
Built-in low-noise power processing, while improving power eﬃciency, lower power consumption;
Combined with multiple low-noise regulated power supplies, it provides a stable, reliable, eﬃcient, and low-noise power supply system.
Qualcomm high-end Bluetooth chip, support LDAC (24bit/96kHz), APTX/HD, SBC, AAC;
High quality all-aluminum alloy shell, support high quality gold plated input and output connection terminals;
Japan Audio Association (JAS) Hi-Res certiﬁcation;
Equipped with remote control and full-featured remote control.

Speciﬁcations

Input……………………………………………………………………………………………………..USB/Optical/Coaxial/Bluetooth/I2S
Output………………………………………………………………………………………..RCA/XLR/4.4mm+6.35 Headphone Jack
THD+N………………………………………………………………………………………………………….0.00006%(-124dB)(UN-WTD)
HPA THD+N…………………………………………………………………………………………………….0.0001%(-120dB)(UN-WTD)
Line output amplitude……………………………………………..XLR 5Vrms
…………………………………………………………………………………..RCA 2 .5Vrms
Headphome output power………………………………………………………………………………………………………..2Wx2(16Ω)
…………………………………………………………………………………………………………………………………………………….1Wx2(32Ω)
Output Impedance…………………………………………………..XLR 200Ω
………………………………………………………………………………….RCA 1 00Ω
…………………………………………………………………………………..HPA near 0Ω
HPA gain control………………………………………………………low d 0B
high +7dB
Dynamic range…………………………………………………………XLR 132dB
HPA 1 27dB
SNR……………………………………………………………………………XLR 132dB
- HPA 127dB
USB transmission……………………………………………………………………………………………………………..Asynchronization
USB compatibility………………………………………………………………………Windows 7 / 8 / 8.1 / 10 / 11(Needs Driver)
Mac OSX10.6 or Later、Linux(Driverless)
MQA decoder……………………………………………………………………………………………………………..USB/Optical/Coaxial
Sampling rate & Bit Width: USB PCM 44.1~768kHz(32bit)
- 2.8224~22.5792MHz(1bit)
- D oP D oP64~DoP256
Optical / Coaxial 44.1~192kHz(24bit)
- DoP DoP64
Bluetooth specification…………………………………….5.1(Supports SBC,AAC,aptX,apt HD,LDAC(24bit/96kHz))
Power Consumption………………………………………………………………………………………………………………………….<20W
Standby power………………………………………………………………………………………………………………………………….<0.5W
Size………………………………………………………………………………………………………………………222x39x207mm(WxHxD)
Weight…………………………………………………………………………………………………………………………………..1.54kg/3.40lbs

SMSL reserves the right to make improvements which may result in speciﬁcation or feature changes without notice.

Remote Control

If the remote control is still ineﬀective when it is close to the machine, replace it with a new battery.
If the user does not use the remote control for a long time, remove the battery of the remote control.
Dispose of used batteries in accordance with local regulations on battery disposal.

Operating The Remote Control

This remote controller use 2 x R03/AAA batteries.

Parts

$S-M-S-L-DO300EX-Headphone-Amplifier-01 $2$$

Display
Knob
RCA output
Coaxial input
USB input
Remote window
4.4mm headphone jack
Bluetooth input
Optical input
AC input
Indicator light
6.35mm headphone jack
XLR output
I2S input

DO300EX Accessories

1* SMSL DO300EX
1* USB Cable
1* Warranty Card
1* Remote Control
1* AC Cable
1* Bluetooth Antenna
1* User Manual

Instructions

INPUTS

USB
BLUETOOTH
OPTICAL
COAXIAL
I2S(HDMI)

PCM FILTER

SHARP ROLL-OFF
SLOW ROLL-OFF
SHORT SHARP
SHORT SLOW
SUPER SLOW
LOW DISPERSION

OUTPUTS

ALL LINE OUT
HEADPHONE OUT
BALANCED
UNBALANCED

HPA GAIN

LOW
HIGH

DSD FILTER

WIDE
NARROW

SOUND COLOR

SOUND 1(5.6M)
SOUND 2(5.6M)
SOUND 3(11M)
SOUND 4(11M)

The AK4499EX operates at a sampling rate of 5.6448MHz.
The AK4499EX operates at a sampling rate of 11.2896MHz.

PRE MODE

PRE MODE is the volume adjustment function switch for the output.
VARIABLE : The output volume is controlled.
FIXED : Disable the volume adjustment function to keep the volume at the current value.
FIXED DSD BYPASS : Open the DSD direct access function. At this time, the volume of PCM or DSD is not adjusted. The output amplitude is fixed to about 3.7VRMS. When this function is opened, the DSD is not processed at all, and the output is directly output.

FN KEY FOR

SWITCH LINE/HPA
OUTPUTS
BLUETOOTH
PHASE

I2S MODE

NORMAL
REVERSED

Note: This option is used to match diﬀerent I2S interface standards, please check the interface deﬁnition of the signal source before use.

I2S DSD CHANNEL

DSDL=PCM DATA (The DSD left channel using the PCM DATA pin)
DSDL=PCM LRCK (The DSD left channel using the PCM LRCK pin)

Note: When using the I2S input to streaming DSD audio, if you ﬁnd that the left and right channels are incorrect, you can use this option to correct it.

AUDIO PHASE

NORMAL (2+,3-)
INVERTED (2-,3+) $S-M-S-L-DO300EX-Headphone-Amplifier-01 $5$$

DIMMER

5 second ~ 60 second
(The range is 5 seconds-60 seconds. After setting, the screen will automatically go oﬀ within this time, and the screen will re-light up if you operate the remote control or the knob at any time.)

BRIGHTNESS
LEVEL 1 ~ LEVEL 6

RESET

During Bluetooth input, long press the middle button of the knob, the system will only reset the Bluetooth pairing status;
During other input, long press the middle button of the knob, the system will clear all settings, including Bluetooth.

About MQA

MQA (Master Quality Authenticated) is an award-winning British technology that delivers the sound of the original master recording. The master MQA ﬁle is fully authenticated and is small enough to stream or download. The DO300EX includes MQA technology, which enables you to playback MQA audio ﬁles and streams, delivering the sound of the original master recording.
Visit How it works https://www.mqa.co.uk/how-it-works for more information.

How to play MQA

DO300EX supports MQA decoding with USB, optical ﬁber and coaxial!
DO300EX’s MQA playback does not require the use of special playback software, such as foobar2000, Audirvanaplus only needs to support ASIO or WASAPI audio output, and when playing MQA audio, it is best to adjust the volume of the computer to the maximum, so that the audio output of the computer is in the best condition.
When playing an MQA ﬁle, the sampling rate of the original master recording is displayed.

Notes on playing MQA-CD

Please make sure that what is being played is a genuine MQA-CD.
Verify that the optical or coaxial signal output of the CD player is an unprocessed source code.