No hum and crack, but the assembly ...

was no problem for me, but inexperienced (which if a man should not take the electrician) ... Well, man should have a little knowledge of electrical engineering haben.Was did not like was that the dimmer no brackets for mounting in a had flush-mounted socket, but only the attachment option by two screws ... Well, it does what it promises and dims wonderfully 5 LED Spotlight GU10 without hum ... therefore still OK!