Amplification system surprisingly met with rapture (3,7)
I believe the answer is:
ear trumpet
'amplification system' is the definition.
'surprisingly met with rapture' is the wordplay.
'surprisingly' is an anagram indicator.
'with' means one lot of letters go next to another.
'met' put after 'rapture' is 'rapturemet'.
'rapturemet' is an anagram of 'EAR-TRUMPET'.
(Other definitions for ear trumpet that I've seen before include "Early hearing aid" , "Primitive hearing aid" , "eight [HEARING AID]" , "sound engineering device" , "Former hearing aid" .)