Boostaroo Revolution headphone splitter and amplifier
When our family travels by plane, we like to set up an iBook or portable DVD player for our kids. It keeps them quiet and occupied, which the other passengers enjoy as much as we do. I've been using a regular signal splitter so both girls can listen at the same time, but the jet's engines make it hard for them to hear the show.
The $80 Boostaroo Revolution High Definition Amplifier and Splitter is a battery powered amplifier and splitter that provides plenty of volume. It's a bit pricey but you can buy cheaper Boostaroo models (I haven't tried them so I can't vouch for them). The other bummer is that it uses AAAA batteries, which I never knew existed until I got this. The unit does come with a set to get you started. But it works wonders. The sounds is crystal clear. I also use it to boost the input volume of my phone recording gizmo so that when I interview people for stories I can hear what they are saying on the recording. Link
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I bought a one-into-three splitter a couple of years back that was also amplified. It worked to split well but it added an audible buzz. Good to know there is something "crystal clear" out there.
You are going in the wrong direction. I too use headphone amplifiers (I own three of them, all from headphone.com but when I travel , mostly by train, some air, I use sealed headphones that block out the outside sound. By just turning up the sound to mask the noise of the location you are damaging your hearing. better to reduce the outside sound and listen at normal volume. look at the Shure or Etymotic or Bose noise canceling/blocking headphones.
A bit more money now, but you will be able to still listen to music when your older with hearing aids.
Yeah, don't turn up the volume, especially for kids ears -- permanent hearing loss can result.
I have a pair of Sony noice cancelling earphones, (not the earbuds, full cushy earmuff style), which only cost about $80, and work very well for the airplane.
Get two pairs for kids, and one for you, if you have the cash.