My comments are based on a conversation with Pass Labs two years ago. I had called to ask about the changes on the rear panel between earlier and later versions of the X250.5 The RCA and XLR connectors are located differently on later models.
The X350.5 has been out about 8/9 years, but a 2013 version is quite different than a 2005, so check for exact age. There have been many minor changes and a major change about 4 years ago.
These changes without changing model number are not really that uncommon. I had an ARC LS15 preamp and noticed that a friends LS15 had a detachable power cord and different capacitors. I called ARC who confirmed this, and was able to have them upgrade mine. I have also owned two major audiophile brand speakers where the designer/owner confirmed changes made without changing model number and offered upgrades.
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