SMSL D300EX Headphone Amplifier User Manual

SMSL D300EX Headphone Amplifier

Product Information

HPA, 0.0001% (-120dB) (UN-WTD) for RCA
Output Voltage| 5Vrms (XLR), 2.5Vrms (RCA)
Output Power| 2Wx2 (16Ω), 1Wx2 (32Ω)
Signal-to-Noise Ratio (SNR)| XLR: 132dB (HPA), 127dB (DAC); RCA: 132dB (HPA), 127dB (DAC)
Supported USB Interface| USB/I2S
Supported Operating Systems| Windows 7 / 8 / 8.1 / 10 / 11, Mac OSX 10.6, Linux
Supported Audio Formats| MQA, PCM (44.1~768kHz, 32bit), DSD (2.8224~22.5792MHz, 1bit), DoP (DoP64~DoP256)
Supported Bluetooth Codecs| SBC, AAC, aptX, aptX HD, LDAC (24bit/96kHz)

Product Usage Instructions

To use the product, please follow these instructions:

1. Connect the product to your computer using a USB or I2S interface.
2. Ensure that your computer is running one of the supported operating systems: Windows 7 / 8 / 8.1 / 10 / 11, Mac OSX 10.6, Linux.
3. Make sure the product is powered on and connected to an audio output device (e.g., headphones or speakers).
4. Choose the desired audio format based on your preference: MQA, PCM (44.1~768kHz, 32bit), DSD (2.8224~22.5792MHz, 1bit), or DoP (DoP64~DoP256).
5. If using Bluetooth, ensure that your device supports SBC, AAC, aptX, aptX HD, or LDAC (24bit/96kHz) codecs.
6. Adjust the volume level according to your preference.
7. Enjoy high-quality audio playback through the connected output device.

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

1. 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 normal.

2. Date of purchase is in accordance with the date on invoice or receipt uesd by seller, and if you buy it on line, you can show the screenshot of trade.

3. 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.

4. Sending it back to our company for repairing.

5. 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;
• Dual mono design, one AK4499EX per channel, 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

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

1. Display
2. Remote window
3. Indicator light
4. Knob
5. 4.4mm headphone jack
6. 6.35mm headphone jack
7. RCA output
8. Bluetooth input
9. XLR output
10. Coaxial input
11. Optical input
12. I2S input
13. USB input
14. AC input

DO300EX Accessories

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

Instructions

INPUTS

• USB
• BLUETOOTH
• OPTICAL
• COAXIAL
• I2S(HDMI)

OUTPUTS

• ALL LINE OUT
• HEADPHONE OUT
• BALANCED
• UNBALANCED

DSD FILTER

• WIDE
• NARROW

PCM FILTER

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

HPA GAIN

• LOW
• HIGH

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+)

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.

MAQ and the Sound Wave Device are registered trade marks of MQA Limited.© 2016

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.

References

• MQA Explained | How MQA Audio Technology Works | MQA
• MQA Explained | How MQA Audio Technology Works | MQA

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