One of my speakers has a 'ø' in the name ( ascii 157 ) 

http://www.theasciicode.com.ar/extended-ascii-code/uppercase-slashed-zero-empty-set-ascii-code-157.html

so this breaks with the following error:

```
UnicodeEncodeError: 'ascii' codec can't encode character u'\xf8' in position 2: ordinal not in range(128)
```