This headphone is ideal for bassists and drummers when a powerful low-end is indispensable in the sound image.
Although the FA 666XB does not replace a subwoofer, it comes very close. The depth of the low-end is impressive, and bassists particularly appreciate it as the lower frequencies are reproduced almost limitlessly.
The FA 666 XB is available as Universal and Custom In Ear.
"Custom" means tailor-made and individually adapted to the ear. The optimum fit in the ear can only be achieved through a personal ear fitting. Nothing offers more wearing comfort than a customized solution. However, this individual fitting not only plays a decisive role in comfort, but also in the sound quality of the headphones. In order to reproduce the bass as intended by the manufacturer, the earpiece must ensure a perfect seal in the ear canal. This is the only way to fully exploit the full sound range, especially in the bass range.

Driver technology
| Driver technology | 3 ways |
| Bass (BA) | 2 |
| Centers (BA) | 2 |
| Heights (BA) | 2 |
Technical data
| Frequency | 20Hz - 20kHz |
| Impedance | @1kHz 16 Ohms |
| Sensitive | @0.100V 121dB |


Price
| Article number | 1012-007 |
| Total incl. VAT | CHF 1,300 |
| Services included in the price | Use of the In Ear Soundbar, consultation, ear impression, digitization in 3D of the ear impression, order, import/customs and shipping costs as well as VAT. |
| Artwork | CHF 125.- |
| Ambience Hole | CHF 80.– |
| 1 pin socket & cable (instead of normal 2 pin) | CHF 125.- |
