Audio/speech issues with sumvision cyclone micro 3

ripcord

Hi all,

Not sure if this is the right place for this - mods please move if needed!

Just bought the sumvision cyclone 3 from amazon purely for watching movies when I go on holiday. Here it is:
http://www.amazon.co.uk/Sumvision-Cyclone-Micro-Media-Player/dp/B0073DN8HE/ref=sr_1_1?ie=UTF8&qid=1346529264&sr=8-1

I have about 200 films/programmes on a 2.5' external drive. I was just testing it today. Most of my films are 720p mp4 files between 2-4 Gb in size.

The thing is that some of them play fine, but some of them have very low speech . I have to turn up the volume really high to hear what people are saying, but then the background noise/music in the film is way too loud.

Would anyone know what this could be? I'm generally technically minded but I wouldn't know much about video encoding/audio tracks/bit rates etc. and all that stuff. Hopefully someone here does!

I doubt the player is broken. It must be something file-specific. For example I have AVIs of Futurama cartoons that sound perfect
Thanks for any help!

ripcord

Mods please close as I posted this in Computer/Tech forums which would probably be more useful.

Thanks!