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Hi,
I don‘t get how you are using the unit dBW.
Quote from above:
„Primare specifies the A35.8's maximum power as 150W into 8 ohms and 300W into 4 ohms, both equivalent to 21.76dBW.“
Here both power values are referenced as the power from a voltage into 8 Ohm load, even if the load is different.
This does not make sense for me.
dBW is referenced to 1 Watt of power, and even if measured based on the voltage, the actual load impedance needs to be taken into account, IMO.
The 300 W into 4 Ohm would be 24.77 dBW then.
Best wishes
Kai