I am considering buying some older Penta speakers (I think Penta III). The system is also available with Adcom GFA 5500 amplifier attached to speakers and an ADCOM switch to switch sound to other rooms with speakers. Looks like amplifier has two input channels. Does that mean I can plug two devices into ampilfier? Can I plug in something like an iPod or iPad (or laptop) into amplifier? Is best arrangement to get a cable that plugs into the iPod/iPad earplug device and then has an RCA lead for other end into amplifier? Could I also put TV audio into the amplifier/speaker system.

Hi, Penta III are active speakers, so you don't need any extra amplifier.

You may have been offered BeoVox Penta, that were the passive version of the BeoLabs.

If you have the BeoLabs, you can basically plug your Ipod into the RCA/phono sockets of each Penta, and you won't believe your ears..

If you have the BeoVox version, then indeed you'll need an amplifier.