Have you ever used a depth-enhancing box such as the old Depthmaster boxes, etc

   I didn't have the depth enhancer box you mention,but, I do own a pair of Superphone 2001 which I believe is made by the same company. yes while I do not know about an increase in depth I do know that those weaker signals that are normally iffy become recognizable when these phones are used. They feature a detachable cord so if yours shorts out you simply order a replacement for it. Beats buying a whole new set of phones. And in addition, they hold tight against your ears and shuts out 90% of background noise. They use a #675 hearing aid battery (the kind that are air activated)

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