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16th September 2019 | 08:18

#12 (permalink)

Jhieminga

Joined: Mar 2002

: CPL

Posts: 3,398

Likes: 328

From: near an aeroplane

My DC H10-13X has 11 years and some 1200 hours of use on it and is still going strong. Doesn't tick the box for (c) in your list but it will provide good passive noise reduction without batteries and therefore ticks that half of the (b) requirement.

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