Fosi audio i5 headphones coming soon

[Tatr76]

Here is my review for the Fosi Audio i5 that launched today (August 15 2025)

i5

back to Fosi Audioback to measurementshome published: Aug-15-2025, updated Sept-15-2025 NO SMOOTHING is applied to the shown plots. Most measurement sites have some smoothing applied which ‘irons f…

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Nice review. Did the wool felt modification, thanks for that insight.

 

[Down South]

My biggest complaint is not with the h/phone itself but with the meagre length of the cables - OK for use with a mobile but way too short to use with sound system, needs to be at least 2 metres.

 

[solderdude]

My biggest complaint is not with the h/phone itself but with the meagre length of the cables - OK for use with a mobile but way too short to use with sound system, needs to be at least 2 metres.

Fortunately the i5 uses standard 3.5mm connectors in the cups so one can choose from a wealth of aftermarket cable choices.

 

[Down South]

Fortunately the i5 uses standard 3.5mm connectors in the cups so one can choose from a wealth of aftermarket cable choices.

That's not the point, Fosi should have thought this out right from the beginning and recognised that there was a need for choice and made available 2 lengths with a small adjustment in price.

 

[solderdude]

They supplied 2 cables with different types of connectors in the pre-launch case.
AFAIK the regular sold version only has 1 cable (3.5mm + push-on 6.3mm adapter).

1.2m-1.5m is fine for portable and desktop duty where 2.5-5m is handy for studio and home audio (where one sits a few meter away from the system).

That leaves the choice whether to make the 3.5mm or 4.4mm 1.5m and the other 3m. Which one would that be and why ?
There is something to be said for both the 3.5(+ 6.3 adapter) to be 1.5m and 3m, the same can be said for the 4.4mm.

When you would need 3m for the 6.3mm or 1.5m for 3.5mm (with or without remote/mic) would make sense.
But 4.4mm would also be handy in both lengths.
They would then have to supply 4 cables.

 

[Down South]

They supplied 2 cables with different types of connectors in the pre-launch case.
AFAIK the regular sold version only has 1 cable (3.5mm + push-on 6.3mm adapter).

1.2m-1.5m is fine for portable and desktop duty where 2.5-5m is handy for studio and home audio (where one sits a few meter away from the system).

That leaves the choice whether to make the 3.5mm or 4.4mm 1.5m and the other 3m. Which one would that be and why ?
There is something to be said for both the 3.5(+ 6.3 adapter) to be 1.5m and 3m, the same can be said for the 4.4mm.

When you would need 3m for the 6.3mm or 1.5m for 3.5mm (with or without remote/mic) would make sense.
But 4.4mm would also be handy in both lengths.
They would then have to supply 4 cables.

Simple - no the buyer could specify which length cables they wanted.

 

[AetherDrive]

Simple - no the buyer could specify which length cables they wanted.

Since you prefer to use your AV and to sit in a lounger, why not get a 3.5mm to 3.5mm extension cable and be done with it? I imagine most headphone cables in your preferred setup would leave you wanting in length no?

 

[Down South]

Since you prefer to use your AV and to sit in a lounger, why not get a 3.5mm to 3.5mm extension cable and be done with it? I imagine most headphone cables in your preferred setup would leave you wanting in length no?

The less connectors in any system the better.