A:AnswerHello. The Model 40n is a two channel integrated amplifier, and thefore does not support the use of a center channel. You can expect to not need a center channel as the left and right speaker will be delivering all the content which would otherwise be delivered by a center channel.
A:AnswerPlaying back files stored on a PC or NAS is made possible using the free HEOS app. The USB input is intended for the connection of a USB flash drive. If you have further questions, please get in touch with https://support.marantz.com/
Thank you
A:AnswerHello,
The Model 40n does not have a pre-out port for a power amplifier feed. That being said, the current delivery of the Model 40n is so impressive, we struggled to find a pair of speakers it could not drive with composure and authority.
