85/100
OUTSTANDINGmedium confidence
Fosi Audio IM4 Hifi Wired Earphones Open-Back Dynamic Drivers IEM Headphones For Music Monitoring Gaming Earbuds
Expert Take
The Fosi Audio IM4 pairs a single 10mm beryllium-coated dynamic driver with an open-back vented shell to achieve an exceptional soundstage for an IEM. However, its tuning is sensitive to nozzle and tip selection, and the lack of isolation makes it strictly a home-listening proposition rather than a versatile portable option.
Pros
- Open-back vented shell delivers an expansive, speaker-like soundstage.headfonia.com
- Small, rounded aluminum shells are comfortable for prolonged listening.soundphilereview.com
- Standard 0.78mm 2-pin cable allows easy aftermarket upgrades.hifireport.com
- Swappable brass and aluminum nozzles provide tuning flexibility without EQ.headfonia.com
Cons
- Open-back design provides negligible noise isolation for commuting or loud environments.hifireport.com
- Sound signature is finicky, requiring careful pairing of nozzles and tips.hifireport.com
- Standard package only includes 3.5mm cable; 4.4mm balanced is extra.hifireport.com
Expert Quality
85
Deal Score
75
Price
$82.87
Current Price
$82.87$124.99-34%
Full Product Page
Price history, images, and seller info
Expert Reviews
Source citations and score breakdown
Audio/IEMs
More products in this category