Mine is not like the picture, it has a volume knob, a switch bypass / normal, and brace yourself for a selector 4-8-16 ohm output impedance! It is really a class, we can say that in thd is three times 400 roros for the same service!
Line output, input amplifier output hp. In fact mine is the minimass 50w I just saw ... It is passive, no power supply or anything cool.
How does it work? very simple, we choose the impedance according to the amp, and you turn the knob until the desired volume. As my hotplate is very measured as mitigation, it is only in the last quarter that it slows as they say.
Of course it eats treble and bass I do not know where they go. It's not huge after all, provided your amp is well equipped 2-channel equalizer type master volume it will go very well for the home.
As for the hotplate not dreaming, the natural distortion marshall 50w in white-hot volume sustainable it will not do. I know of no attenuator that does.
But the services rendered by the weber are estimable, it can juggle a head lamps for home and small box via minimass and the local big box and repeat.
It is also a noise gate passive extra, cool when the amp has no loop.
A little research you should find the plan of the machine for you to make one cheaply. I got mine for sixty euros okaz, Noel was a bit (in the month of August) eh!
Compared to thd I put 3-4 points lower in sound quality, but the price compensates for a lot I guess. I do not see less 200roros difference between the two, stay tuned!