64 Audio Fourte In-Ear Monitors Speakers We optimized the HD 660S

We optimized the HD 660S for efficiency on a wider range of devices to accommodate the varying levels of power present in output amplification circuitry

As a result

High-performance chassis with six-way

Six conductor version

350 VA Power Amplifier

64 Audio Fourte In-Ear Monitors Speakers We optimized the HD 660S2 Years Local Warranty. Any mention of "us," "we," "our," etc is by 64 Audio, not AV One. Fourt is the pinnacle of in ear monitor technology. With its entire design being made up of industry firsts, Fourt isnt just a four driver hybrid UIEM. The innovations of acoustically shaping micro chambers, direct radiating drivers, and the single sound bore come together in our patented tia technology. Fourt is our first IEM to feature internally integrated