The manual states 2 x 50mm for >5m.
Would 1 x 70mm be adequate for a 1m length?
@djwiscombe, is your 1m length figuring round-trip, or is that only a one-way measurement? If it's 1m round-trip, then I'd say yes, you could probably squeak by with that gauge, but if it's only a one-way measurement, then no, you should definitely stick with 2x50.
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