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Personal Shopperis TechRadar’s semi-regular advice column, where we answer questions from readers.

We like to consider ourselves a helpful bunch.

A trio of headphones being measured, with TechRadar�s �Personal Shopper� franchise badge

Sony WH-CH720 (29cm); QCY H3 Pro (29.5cm) and Sennheiser Momentum 4 Wireless (27.5cm) measured by your TechRadar team (or personal shoppers, of you prefer)

Here’sall the info about our Ask An Expert service.

I can’t resist an audio-related challenge, dear reader.

Flattery is not lost here]but again there is no help for my query.

A selection of three pairs of headphones with measuring tape to measure their full extensions

Sony WH-CH720 (29cm); QCY H3 Pro (29.5cm) and Sennheiser Momentum 4 Wireless (27.5cm) measured by your TechRadar team (or personal shoppers, of you prefer)

Surely there must be others facing this dilemma?

Challenge accepted, sir!

Even a quick look at the headshell online helps!

Bose QuietComfort Headphones…

Or searching for an image of headphones with the arms as far-extended as they can go?

You won’t find either.

Use your head

So, what did we learn?

Cambridge Audio Melomania…

But we’re not done!

Maybe you’re wearing headphones right now, as you consult these figures.

Why not measure your cans and post the data in the comment thread?

DALI IO-8 Over-The-Ear…

Sennheiser Consumer Audio…

Sony WH-1000XM5S Noise…

Pre-Owned Sony WH-CH720N…

1MORE SonoFlow-Pro Noise…

Sonos Ace - White - Wireless…