Looking over my last post, I see something that needs clarifying.

"Same power in either case, but the ratio is different." That's true if you are using, for example, a dynamic mic. A dynamic mic puts out "x" amount of power and you can have high voltage (comparatively - we're talking millivolts here) but fragile, or low voltage but sturdy. Choose your flavor, same power in both cases.

However, when it comes to line levels, there are two "flavors" and they are definitely different. A "0dB" output in pro equipment tends to be about 0.8volt to 1.2 volt and can drive a 600-ohm load, which is low impedance. In consumer equipment, the "0dB" standard is about 0.3 volt into a load of 5K or higher, which is high impedance. So the consumer standard is weaker in absolute terms - both lower voltage and higher impedance (less current drive capability). This isn't a necessary feature of impedance, it just happens to be what engineers have settled on as reasonable standards for the respective applications.

Pro/sumer equipment tends to mix standards. Rule of thumb: anything that appears on an XLR connector, especially if balanced, is likely to be professional line level. Anything that appears on an RCA connector is likely to be consumer level. 1/4" jacks can be either.