SOLVED: A student exchanges the stock headphones (β1 = 89 dB) for her mp3 player for a new set that is louder (β2 = 92.5 dB). If the first set produced a
How to Make MP3 Files Louder? (Increase or Decrease the MP3 File Volume)
MMAK TG-113C Dual Bass Wireless Bluetooth Speaker Portable Stereo MP3 Audio Player with Louder Sound & Built-in Mic (Color May Vary) : Amazon.in: Electronics