qdc / QD1 USB DAC Portable Decoder

"QD1" is the brand's first portable USB DAC, developed to easily bring out the excellent performance of IEMs and headphones from smartphones, PCs, etc.

■USB Audio Bridge CT7601PR and CS43198 Dual DAC Configuration
・QD1 is the brand's first Hi-Fi portable USB DAC developed by qdc to easily bring out the performance of IEMs and headphones from smartphones, PCs, etc. The hardware consists of a combination of the audio bridge controller CT7601PR, which supports high-spec audio formats, and the high-performance and reliable Ciruss Logic DAC chip CS43198 dual DAC. The PCBA is specially constructed in accordance with strict sound quality performance requirements, ensuring a dynamic range of up to 130dB and achieving both high output and low distortion, and enabling playback of PCM 768KHz/32bit and DSD 256 (DoP).

■Supports 3.5mm unbalanced and 4.4mm balanced output
・Supports both 3.5mm unbalanced and 4.4mm balanced outputs. At high gain, the high output of 2Vrms (unloaded) for unbalanced output and 4Vrms (unloaded) for balanced output allows you to drive IEMs and headphones with ease.

■Two-stage gain switching function
-QD1 is equipped with a two-stage gain adjustment function of low gain and high gain. By switching the gain depending on the efficiency of the connected IEM or headphones, more optimal volume adjustment is possible. To switch between high gain and low gain, press and hold the "+" button and "-" button simultaneously for more than one second while QD1 is operating. The lamp status is yellow for high gain and red for low gain.

■Music mode (UAC2.0)/eSports mode (UAC1.0) switching function
- QD1 has a switching function between Music mode (UAC2.0), which supports high-quality sound formats, and eSports mode (UAC1.0), which supports home game consoles. While holding down the "+" button, connect the QD1 to a USB port on a smartphone, PC, game console, etc., and release the button after the QD1 light flashes red to switch to eSports mode (UAC 1.0). If you remove the QD1 from the device, it will return to the default Music mode (UAC2.0).

■Detachable USB Type-C cable
- The QD1 uses a detachable USB Type-C. A braided USB Type-C cable that is easy to handle is included for connecting to devices.

[Product Usage Precautions]
● Compatible with Android smartphones and tablet PCs, Windows 10/11 and Mac OS PCs, and iOS devices. Some Android devices may require certain settings to be adjusted to function properly.
● Due to hardware, software, and system limitations of the specific supported devices, we do not guarantee that all features will function properly or be available.
●When connected to a Windows PC, the device will be automatically recognized and the correct driver will be installed. To play high quality sound, you may need to install a separate USB DAC driver, which can be downloaded from the support page of the website.
●To play DSD and high quality PCM sound sources (Hi-Res sound sources) on your smartphone, you will need to install a separate free/paid app that supports high resolution audio playback. If you use the built-in player of your smartphone, the audio may be downsampled.
●When connecting to a playback device, always check the volume level before connecting earphones or headphones and wearing them in your ears. Some devices may automatically set the output level to maximum volume when connected. Listening to headphones or earphones at maximum volume may damage the headphones or earphones or damage your hearing. Always check the volume level before each use.
●Listening at maximum or high volume may cause serious damage to your hearing. QDC, its affiliates and agents are not liable for any damage or injury caused by negligence or improper use.

＜Specifications＞
■Product name: QD1
■Color: Sapphire
■Body material: Aluminum
■Weight: Approximately 36.8g
■Size (W×H×D): 30×15×60 (mm)
■DAC: Ciruss Logic CS43198 ×2
■Supported sampling rates: PCM 768KHz/32bit, DSD256(11.2MHz/1bit) DoP
■Dynamic range: Approximately 130dB
■Input: USB Type-C (UAC 2.0 / UAC 1.0 switchable)
■Output: 3.5mm unbalanced output (3-pole), 4.4mm balanced output (5-pole GND wiring)
■Output level (unloaded):
・Low gain: 0.7Vrms (unbalanced) / 1.4Vrms (balanced)
・High gain: 2Vrms (unbalanced) / 4Vrms (balanced)
■Supported OS: Windows 10, 11 / MAC OS X 10.7 or higher, Android OS / iOS (smartphones and tablet PCs), Switch / PS5 (home game consoles)
■Accessories: USB Type-C cable (approx. 8 cm)
■Country of manufacture: China
■Manufacturer's warranty: 1 year for main unit / 6 months for accessories