5 Ch AMP weight compare - Is transformer the reason for the weight?

[MasterApex]

Proceed AMP5 , 5x125W @8ohm, 3 transformers , weight 110lb

Monolith 5X, 5x200W@8ohm, One 1040VA + One 800VA transformer, weight 78lb

Krell KAV500, 5x100W @8ohm, One 1000VA transformer, weight 47lb

Emotiva XPA5 , 5x250W @8ohm, ??VA transformer, switch mode power supply , weight 46lb

 

[Beave]

The large transformers are definitely a large part of the weight. Second most is probably the extruded aluminum heatsinks.