I mounted a pair of 111 speakers on my 500M.
They do not fit out of the box. They are too far forward and the brackets do not match up.
To mount them I needed:
- 4 M5x16 bolts to screw into the plasma
- 4 1/4 inch nylon standoffs
- 4 washers to get a yunt more to make the speaker flush.
The top bracket can be left alone and the bottom bracket needs the hole expanded about 1/4 inch. We used a Dremel and a carbide bit. It was not hard. If you make the top flush, the bottom speakers are just a hair short. This seems to be as designed. My Friends 151 speakers do are just a bit short too.
PioScrews - Shows the parts and the black original screw.
BottomRightBracket - shows the original right bracket.
BottomLeftOverBottomRight - shows the right altered bracket with the unaltered left.
TopLeft - shows the top of the left speaker mounted.
BottomLeft - shows the bottom left speaker mounted.
FullView - is the finished product.
Of course, you could Dremel out the top a yunt to split the difference.
But I think they look great.
So how do they sound. Just fine!
I turned them up louder than I ever would - no problem.