Is anyone familiar with Michael Green formerly Room Tunes ? Mike likes tuning components by taking covers off, cracking CB screws, enclosure screws, removing wire ties separating wires. Loosening Transformer screws as well.
Try removing cover first. Listen. Crack screw at IEC. Listen. Crack screws on CB. Listen. It is a process. One at a time so you can ascertain a result. Remove rubber footers and use wood. We like Cardas blocks but I would try other type woods. If the bottom cover can be removed do that as well.
More open, better imaging and sound field. Bass, did I say Bass tighter and focused. Tighten those screws on speaker drivers, just enough NEVER over tighten. Have fun hearing the changes.
charles