The KEF is highly detailed and lacks bass. The specs say they go as low as 43hz, but I don't see that at all. I auditioned some iQ5's at a local vendor and I thought they totally lacked bass. Vocals were great though! You'll want a subwoofer with them.
The Energy definitely has bass but is not a detailed or bright speaker. Its more of a laid back or neutral/warm speaker. Compared to the KEF you would think its muffled.
You need to decide what you prefer because they sound nothing alike.
If you can go listen to some Energy and KEF or other speakers please do. The Energy is also physically a much larger speaker. The KEF is 32" H x 6.9" W x 10.3" D and 22 lbs.
The C-500 is 37.5" tall, 8" wide, 14.5" deep and 44.1 lbs so its weighs twice as much as the KEF iQ5.
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