Recording in 4.0

[Skybird74]

I am using a Yamaha EMX640 that I have been using for about 10 years now. It is still being sold on the market as one of the best amps out there. On the front are "Record Out" jacks specifically for this purpose, which in the past I would use to go directly into my cassette recorder.

I still have the book which states: "output jacks which send line level signals from the EMX640 to external devices. A stereo recording device such as a cassette rcorder or MD recorder can be connected to the REC OUT jacks"

The output specs are as follows:
Actual source impedance: 600(icon that looks like a headset)
Norman impedance: 10k(icon...) Lines
Nominal output level: -10dBV (316 mV)
Max. output level before clipping: +10 dBV (3.16 V)

Do you have any idea what all that means?