The HA-S has a special NFB (Negative Feedback) switch, that allows you to choose from a high fidelity clean and pristine sound, or a warmer, more harmonically rich sound as expected from a vacuum tube.
When the NFB switch is OFF, the harmonics present in the Nutube (triode tube) will be amplified to create a sound rich in harmonics, warmth and textures. When the NFB switch is ON, the distortion ratio and frequency characteristics will be modified, creating a really detailed and clean sound.
For further sound modification, we have included two OP amp options for the output: the premium audio oriented "MUSES01" and the industry-standard “NJM4580”, both from JRC. These can be easily replaced so even the most purist audiophiles will be able to customize and adapt the sound of their HA-S to their heart’s content.
For advanced users who want to customize their amplifier, even more, the circuit diagrams are readily available, making it really easy to change discrete components and make your own and unique headphone amp matching your desired tone and performance -, the possibilities are endless!
