The measure of the limes.
As to what goes on inside beyond the detail shot above…
… with the power supply banished from the enclosure, it doesn't take that much. The four output devices mount to the small vertical board. The wooden volume knob isn't lime because in trials, that light soft wood got quickly dirty from handling. Instead it's rugged darker and harder American Walnut. Sharing the same enclosure across five Limetree models as Lindemann already do with their six larger pieces makes big economic sense. They get to order far larger quantities, the per-unit pricing goes down and you pay less.
As to the assets…
… they're exactly as the descriptions predicted. Inserting a headphone auto-mutes those line-outs so operation couldn't be simpler. Plug 'n' go. The overview from designer Norbert's perspective:
♠ fully analog circuit with three main features:
♦ The volume control of Muses 72320 features laser-trimmed resistor networks to be sonically the absolute state of the art.
♦ The power supplies use ultra-low noise voltage regulators with a total noise of sub 5μV at the gain circuit. By using a medical-grade SMPS, we get extremely low interference of mains harmonics which normally cause problems in the lower frequencies.
♦ The gain circuit is a fully discrete diamond buffer, an X-balanced buffer which is internally perfectly balanced. We use additional Wilson mirrors and thermal coupling to make it low distortion and work in class A. This circuit has high internal bandwidth of >1MHz. We don't apply global feedback to let the music flow. This causes some small amount of distortion which is far lower than any distortion caused by a headphone itself but gets us a very lively impression of the music. This lets the Limetree Headphone double as a very high-grade preamplifier. The signal path uses audio-grade thin-film resistors and foil capacitors throughout. Polymer power-supply bypass caps obtain ultra-low noise figures on the supplies.