you actually don't hear the sound from the front; it is more like open headphones. wirks very well; our daughter can hear her stories/music from the ipod, while we don't have to hear them, again, for the 100th time ... but still able to communicate.
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for older children, there has been a Recaro model with speakers before; and not that expensive (I think we paid 250 Euro):
http://www.recaro.com/index.php?id=563&L=03
you actually don't hear the sound from the front; it is more like open headphones. wirks very well; our daughter can hear her stories/music from the ipod, while we don't have to hear them, again, for the 100th time ... but still able to communicate.