1-Don't buy this player if you have fat fingers or bad eyes, due to small touchscreen
2-It puts out a neutral sound signature, and has two different equalizers
3-EQ does not work with Hi-Res audio, but the MSEB does.
4-Replaygain will work if you add replaygain tags to files using
foobar2000 program (free)
5-Repair metadata: copy all music into
TagScanner (free), highlight all, hit save.
6-If album art not showing (rare), copy it into windows paint and reduce the size
7-If sorting by Genres or Artists, icon in upper right switches album view / track view
8-New ap80 has 2 plastic protectors, remove top layer, keep 2nd layer. 2 replacements in box
9-Use gain on high option to boost volume beyond 100, for headphones with high ohms
10-If touch screen freezes flick off on. If OS freezes hold power button 10s to force shutdown
11-Enabling 'in line remote' option makes button on headphone cable work
12-Click button on headphone cable once for play/pause, twice to skip track
13-Faulty cable button can cause random playback issues. Disable 'in line remote' option
14-Charge time: usb 3.0 port = 2hrs / 5v2.4a wall charger = 1hr20min
15-Charge battery between 20-80%, 5C-20C temp, 5v1a-2a, for longest life
16-Beware: cold winter temperatures may damage the battery or the screen
17-Beware: hand sanitizer or lotion can get into the buttons and stick them up
18-FM radio uses wired headphone cable as antenna, so will not work with Bluetooth
19-Output frequency is 20-40kHz. Use
Spek (free) to show the true level of Hi-Res files
20-Plays music off USB stick using a OTG type C to A adapter, but drains battery faster
21-Use another microSD card with OTG USB-C to microSD adapter, but drains battery faster
22-USB modes: Storage=transfer files & charge, Audio=USB DAC only, Dock=charge only
23-USB can work as input (OTG, file transfer, DAC) or output (to amp)
24-You can't install apps (google play, apple store, etc..), or connect to wifi, on ap80
25-SD card and TF card mean the exact same thing, u can use either one
26-Google: ap80 firmware, to find the latest firmware update and instructions
27-Beware of fake SD cards. Don't update firmware before testing yours. Try H2testw (free)
28-First firmware update may require FAT32. Switch to exFAT for everything afterwards
29-Standby option cancels Idle timer. Only turn screen off, leave unit powered on
30-If using standby music will not un-pause after one minute with screen off
31-Sleep timer counts down immediately, playing music or not. Disables itself afterwards
32-Gapless playback option is helpful when working out to EDM
33-If BT not pairing reboot both. Start pairing, hit search devices, wait, check bottom of list
34-Ap80 can scan almost 2000 songs per minute, when updating music database
35-Database can index tag data for up to 20 000 tracks max
36-Don't need tag data, can navigate folders, and play files, directly from sd card
37-Windows error checking scan can create a folder: FOUND.000, it's safe to delete
38-'Play through folders' option gives continuous playback when playing directly from sd card
39-Folders will hesitate to open by +1sec for every 500 items listed within them
40-Hold touch on any file/folder to access bulk playlist, or bulk trash, options
41-See total tracks on sd card: sort by All, play song, check number below album art
42-For playlists; use a:\ indexing, in m3u files, in folder named: playlist_data
43-Tracks listed in .cue files will display when navigating sd card by files, or tags
44-It will display MQA when playing an MQA encoded flac, if you have new firmware
45-Soundfield option simulates wider soundstage, use 15% on closed back headphones
Official frequencies of the MSEB (MageSound 8-ball):
1 -- Overall Temperature tilt of whole line to treble(cool) or bass(warm)
2 -- Bass extension 70Hz and below
3 -- Bass texture 100Hz (medium)
4 -- Note thickness 200Hz (wide)
5 -- Vocals 650Hz (very wide)
6 -- Female overtones 3kHz (tight)
7 -- Sibilance LF 5.8kHz (medium)
8 -- Sibilance HF 9.2kHz (medium)
9 -- Impulse response 7.5kHz (very wide)
10 - Air 10kHz sloped all the way to 20kHz
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https://manuals.plus/hidizs/hidizs-ap80-marketchangers-manual
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https://www.hidizs.net/pages/download-center
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https://fccid.io/2ANW4-AP80/User-Manual/15-AP80-UserMan-r1-4122196