I'm looking for a monospace font which has a lot of the unicode glyphs. In particular I'm interested in the speaker symbols, code points 1F507 to 1F50A.
I'm not sure if the speaker would be included, but have you tried GNU Unifont? It is monospaced, it comes in
You can see the insanely huge list of covered glyphs here.
Monospace, on the other hand, is based on Georgia and covers 2,862 glyphs. Apart from the languages, it includes: