"Arny Krueger" wrote in message
...
wrote in message

ups.com
What we do know about QSC amplifiers is that they are a Class B
ruggedized rackmountable unit requiring forced air cooling.


False claims. They are class AB amplfiers, The USA-400 model has no
cooling
fan - it is entirely convection cooled. For the record I own two USA-400
and
two USA-850s.

Again Cal has been exposed for making poorly-informed claims.

Arny, they sound gawdawful.
You really do seem to lack significant hearing acuity.