Koss QZ-77 Active Noise Reduction Ear Plug System
Engineered around Koss’s acclaimed in-ear technology, the QZ77 combines Active Noise Reduction (ANR) circuitry with precision passive isolation . QZ77 integrates expandable memory-foam cushions that conform to every contour, sealing music in and distractions out.
Dual Noise Reduction Technology
The built-in ANR circuitry targets and cancels low-frequency engine and HVAC hum. Meanwhile, the physical Passive Noise Reduction created by the snug ear-plug design suppresses mid and high-frequency disturbances. Thus, the result is a quiet canvas where your audio can thrive.
Custom Memory-Foam Comfort
Each ear tip is crafted from a slow-recovery foam that gently expands within the ear canal. Therefore, this bespoke fit not only maximises isolation but also enhances bass depth and treble clarity.
Travel-Ready Construction
Lastly, weighing next to nothing and small enough to slip into any carry-on, the QZ77 is purpose-built for frequent fliers and commuters. Its durable housing protects the dynamic elements that reproduce a full 10–20,000 Hz spectrum for faithful, high-resolution playback wherever you roam.
- Active Noise Reduction targets low-frequency noise
- Passive isolation via expandable memory-foam ear tips
- Dynamic drivers deliver 10–20,000 Hz clarity
- Lightweight, compact and ideal for travel