Loudspeaker (6)
(Other definitions for woofer that I've seen before include "Loudspeaker to reproduce lower sounds" , "Loudspeaker that reproduces lower frequency sounds" , "Low-frequency speaker" , "Lab possibly" , "sound booster?" .)
<span class="explanation-format__ClueExplanation">'<span class="explanation-format__original">loudspeaker</span>' is the definition.<br/ ><span class="explanation-format__explanation">(tannoy is a kind of loudspeaker)</span><br/ ><br/ >This is the entire clue.<br/ ></span>
(Other definitions for tannoy that I've seen before include "Public address system" , "Speaker" , "Orator's amplifier" , "Loudspeaker system" , "Public-address system" .)