Sonically I found the CT10 was more than up to the task of delivering high-resolution music without any negative sonic issues. Your choice of earphones and EQ settings will have a far greater sonic influence of the final sound than the player itself. I also used the CT10 with several Bluetooth headphones. The inclusion of aptX HD made for a wireless headphone experience that was on par with what I heard from comparable wired headphones.
The only glitch I experienced during playback was on DSD DFF 5.6 files played from a 128GB card. Every 30 seconds (or so) there occurred an extremely short drop out. IRIVER could not duplicate the bug when I sent them the file, but it occurred on two different CT10 players, so I suspect it was something to do with the card since these same tracks played correctly when the card was loaded into a A&K A&futura SE100. Overall the operational efficacy of the CT10 was on par with Astell&Kern's other players. Its touchscreen responded with alacrity, and its menu options were well laid out.
I suspect the ACTIVO CT10 will be a big hit. It delivers much of Astell&Kern’s ergonomic mojo in a small, value-packed player. For those music fans who don’t travel with difficult-to-drive headphones the ACTIVO CT10 could be a near-perfect travel and workout companion.
Astell&Kern ACTIVO CT10 portable digital audio player
Type: Portable digital music player
Formats Supported: WAV, FLAC, WMA, MP3, AIFF, DSD
Sample Rates: 8KHz to 192 KHz/24 PCM; DSD 64 to DSD 256
Power Output: 22 mW @ 8 ohms; 36 mW @ 16 ohms
Signal to Noise: 115 dB
Outputs: One 3.5mm mini-stereo headphone jack and Bluetooth 4.1.
Dimensions (HxWxD): 3.67” (93.2mm) × 2.57” (65.2mm) × 0.61” (15.5mm)
Weight: 3.95 oz; 112 g.
Price: $299 US, £249 UK
Manufactured by: IRIVER Inc. / Astell&Kern US