64 Audio is proud to introduce our newest four driver custom in-ear monitor, A4s. This complete redesign of our four driver platform is elevated by the Dynamic low frequency driver, making this 64 Audio’s second hybrid custom IEM. Along with that major update, inside A4s is our Tia technology, LID and our patented Apex and 3Dfit tech. While this is targeted at musicians looking for a rich enveloping monitoring experience, the frequency response, detail, and soundstage capabilities of A4s exceed other audiophile products at almost any price point.
Current lead time is 4 weeks from the time 64 Audio receives the impressions. You need to visit an audiologist to get your ear impressions made first. By purchasing from Bloom, you receive our attentive lifetime support. We'll assist during each step of the process. Keep in mind, all custom earphones orders are final.
For more information about ordering customer IEMs, check out our Custom IEMs Guide or watch our video on Getting Custom IEMs. Feel free to Call, Email, or Message us if you have any questions about ordering custom IEMs.
Tia
A tubeless design that reduces resonance for a transparent and lifelike sound signature.
Apex
Only from 64 Audio, apex alleviates listener fatigue by releasing air pressure sealed in the ear canal. This venting enables musicians and music enthusiasts to listen more comfortably for longer.
LID
Enables a consistent, reliable sound regardless of audio source.
| Driver Type/Count | Three precision balanced armature drivers, one dynamic driver |
| Driver Configuration | 1 tia high, 1 hi-mid, 1 low-mid, 1 low |
| Frequency Response | 16Hz – 20kHz |
| Sensitivity | 111 dB/mW |
| Impedance | 11Ω @ 1kHz |
| Crossover | Integrated 4-way passive crossover |
| Isolation | -20dB with m20 apex module |
