
1) Audio amplifier manufacturer 2) Guitar amplifier manufacturer
Found on
https://www.crosswordclues.com/clue/carlsbro

Carlsbro is a UK-based supplier of musical instrument amplification and speaker systems, originally founded by Stuart and Sheila Mercer in Nottingham, England in 1960. Their equipment has been used by artists such as The Beatles, Mick Jagger and Oasis. The company entered administration in 2009, but has since been relaunched ...
Found on
http://en.wikipedia.org/wiki/Carlsbro
No exact match found.