RetroSound Apache User Manual page 38

FREQUENTLY ASKED QUESTIONS
I have your radio with an amp connected, but hear a
whining/buzzing sound through the speakers when I step
on the accelerator.
If you have an external amplifier installed and experience a high-
pitched noise that varies with the engine's RPM, there are many
possible solutions:
• Make sure the amplifier's gain controls are not turned all
the way up. Amplifiers amplify everything, including noise.
• Try grounding the amplifier near where it is installed.
• Try a filter on the amplifier's 12 volt power lead. Make
sure to use a filter that includes a ground wire.
• On rare occasions, noise can be introduced through
the antenna lead. If disconnecting the antenna makes
the noise go away, you need to replace or repair
the antenna plug where it goes into the radio.
When I plug in my flash drive the screen says
and it won't play the files I placed on the drive.
• Make sure the files on the drive are .mp3 or unprotected
.wma (Windows Media Audio) files. iTunes files are
.m4a format and need to be converted to .mp3
format, which can easily be done using iTunes.
• Verify the capacity of the flash drive. Apache will
only play 1 gig up to 32 gig size flash drives.
• Make sure the flash drive is not NTFS formatted. Always
use the FAT32 format (most drives are formatted with
FAT32 from the factory). Be sure to do a full format rather
than a quick format, and check that none of the files or
folders have names longer than 64 characters. It is very
important that none of the audio files have DRM. Use only
MP3 files or unprotected Windows Media format files.
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