This is a review and detailed measurements of the Loxjie D40 stereo DAC with Bluetooth and headphone amplifier. It was sent to me by the company and costs US $430.
View attachment 187624
I like the design -- it reminds me of some European brands. Bright white LED display is highly responsive as is the rotary controller. I expect and am happy to see built-in power supply in this price class:
View attachment 187625
Loxjie D40 DAC Measurements
Let's start with our usual dashboard using USB input and XLR connection:
View attachment 187626
This is stellar performance with distortion at -140 dB and noise floor that is almost falling off the bottom of the chart! No wonder then that the D40 ranks as the forth best DAC I have ever measured:
View attachment 187627
View attachment 187628
RCA output performance is nearly as good:
View attachment 187629
Dynamic range as we could predict is excellent:
View attachment 187630
IMD performance is excellent other than a small indication of "ESS DAC IMD Hump:"
View attachment 187631
Linearity is textbook perfect:
View attachment 187632
Multitone results is superb:
View attachment 187635
Jitter performance over USB is excellent as well:
View attachment 187633
Toslink and Coax add some low frequency benign jitter:
View attachment 187634
Three filters are provided:
View attachment 187636
Attenuation is quite high which helps when we perform wideband THD+N measurements:
View attachment 187637
Loxjie D40 Headphone Measurements
Let's start with 50 mv and full output SNR:
View attachment 187638
The former is slightly below average:
View attachment 187639
Fortunately there is good amount of power with very low noise and distortion in general:
View attachment 187640
View attachment 187641
Notice lack of clipping. This means any distortion you hear is in the headphone or the content!
Loxjie D40 Listening Tests
I performed my testing with my Sennheiser HD650 and Drop Ether CX which are at different ends of the impedance spectrum. There was plenty of volume driving both with superbly clean sound. Driving my everyday Dan Clark Stealth headphone was also satisfying but due to its lower sensitivity, the D40 could not drive it to its maximum volume.
Playing at this level of performance is not easy: tons of attention needs to be paid to circuit design and layout to stomp any and all sources of noise and distortion. Other than leaving some ESS IMD distortion on the table, the D40 performs superbly in DAC department. The headphone output while not at the same level, still provides excellent performance and volume level.
I like the physical design which sets itself apart from the competition while being very performant to user input.
It is my pleasure to recommend the Loxjie D40 DAC and Headphone Amplifier.
As always, questions, comments, recommendations, etc. are welcome.
are much appreciated using: https://www.audiosciencereview.com/forum/index.php?threads/how-to-support-audio-science-review.8150/