Resmed S8 and Battery Power

LyleK1 wrote:"The most significant thing to be aware of is that a Resmed S8 has negative polarity (-) on the centre pin of the DC barrel connector. Since there is no standard or convention for wiring these connectors, there's a 50/50 chance that any general purpose DC connection cable may be wired incorrectly for use with an S8."

Now, I'm confused!
I talked to the business I purchased my Resmed S8 Autoset II from and he said the center pin is positive!
Any chance of some clarification? I'm fine with buying a regular 12 volt set-up and I have defined 12 volt power source (on my boat) but who do I believe!!?
I can wire the the pin either way by changing the wires attached to the plug.
Or am I better off buying the $80 DC converter and being able to use the 12 volt plug for charging other devices when I'm not sleeping?

The Mule wrote:I talked to the business I purchased my Resmed S8 Autoset II from and he said the center pin is positive!
Any chance of some clarification?

The Mule wrote:Or am I better off buying the $80 DC converter......