I get a bit hissed off when I see an XLR connector on a guitar or bass amp labelled "DI Out, unless that is it is balanced and at microphone level. Even better if it is transformer fed and thus earth free.
"But transformer are expensive" you cry. Not really, for a feed at -30 to say -10dBV* almost anything will do and can be found retailing at under $5. How much will a big amp company pay for them?
If you are going to provide a 'Line Feed' use a jack. The XLR is not the natural inhabitant of the gitists gig bag. Sound engineers however generally DO expect an XLR feed at mic level balanced. So the half arsed XLR pleases neither camp!
*In the guitar electronics world, sanity reigns for levels and they are inevitably expressed in dB "V". The rest of the audio world limps along with the archaic dBu, a unit derived from the days of A.G.Bell and his telephones.
Well, that's torn it! Just looked for some cheap traffs to backup my claim and found TEN in a pack for less than seven quid! Ordered them and will do some tests when they arrive. If anyone wants one to play with, PM me.
Dave.