Signa Solo

Which model Humax are you referring to?

Thanks for the model number, I went over the owner's manual and while there's a lot of information given it seems fairly straight forward. You might want to try using an HDMI cable from the Humax to the Polk and make sure the Polk is set to the correct input. There is an audio section in the Humax's setup and make sure it is set to Dolby 5.1 digital and any volume level adjustments are set at 50% or slightly higher (you can always readjust it after you get things working).
To see of the Polk is working you could plug some other device, such as a smart phone using the 3.5mm analogue connection (that's the one cable not supplied by Polk) from an ear bud connection on the phone. I hope this helps.

You're welcome, I'm sure they'll straighten things out.

I don't believe that's possible, except by moving the subwoofer closer or further away from walls and corners (which work to reflect bass waves). You should be able to order a replacement remote from Polk at: 1-800-377-7655.

The best place to begin would be with Polk's CS department at: 1-800-377-7655 and have the unit's serial number available when you call.