У вашего броузера проблема в совместимости с HTML5
Alpine MRV-F300
Specs:(RATED 14.4V, 20 - 20k Hz)
MAX Power Bridged 240W x 2Ch
MAX Power 75W x 4Ch @ 4 ohms :
Continuous Power
50w RMS x 4CH @ 4 ohms
60w RMS x 4CH @ 2 ohms
Bridged 2 Channel into 4 ohms: 75W x 2ch
Weight : 3.7kg