Wanna make it sound thicker? Stack some 4ths to your root.

Example...

E5 powerchord would look like

D--9
A--7
E---

Stack a forth on it for a

D--9
A--7
E--7

or you can even stack the diad (Em here) for a

D--5
A--7
E--7

which is actually playing the second voicing of Em.

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