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1 Across, Fuel from seaweed wrapped in lettuce (4,3)

5 Across, Someone posting a few letters for one "doing bird"? (7)

10 Across, A sound driver, this underdog (9)

11 Across, A surprised expression remains in the auditorium, by the sound of it (9)

Compiler - HOB

Many Thanks

1 C o alga s

11 accoustics

a coo sticks

5 Tweeter

10 https://en.m.wikipedia.org/wiki/Subwoofer

Good morning cerasus and many thank to you.

Good morning to you diablos