Although all cables starting with the Robin Hood from the Folk Hero series are burned in during 37 hours after completion, and the Dielectric Bias System electrostatically aligns the insulation in a way that would otherwise only be possible with an extended break-in time, I treat the bi-wiring version of the ThunderBird to two full days of music, albeit at night only at very low levels. It replaces the Göbel Lacorde Statement Speaker, a single-wiring cable that costs about twice as much as the ThunderBird. Since my Goebel Epoque Aeon Fine is equipped with bi-wiring connectors, I usually use Lacorde Statement jumpers. But that is not necessary with the ThunderBird ZERO and BASS. Immediately after reconnecting, I miss a lot: the entire left channel. I was probably a little over-cautious when bending the short pieces of cable with the U-spades, and so one has come loose from the terminal of the amplifier. But that little mishap is quickly fixed. During the second day and with rather lustfully selected albums like Charlie Haden and Pat Metheny's "Missouri Skyes" or Keith Jarrett's "Hymn Spheres," a first impression solidifies rather casually: The music comes across tremendously clean and relaxed. The sound seems to be freed from a light veil of gray and does not show the slightest traces of roughness. One thing is already sure: So far, the ThunderBirds present themselves tonally completely inconspicuous, relaxed, and open. Long-term listening becomes a real pleasure.

I have to fall back on more well-known tracks to assess the abilities of the ThunderBirds better. In terms of rhythmic tension, the fullness of detail, and the recording's clarity, the mythical creatures act on a very high level. And the bass drum on "God Bless the Child" in the interpretation of the Keith Jarrett Trio – to name just one track – is enjoyable thanks to lots of energy in the bass. The deep drum comes across even a bit more voluminous than with the Lacorde Statement, which spoils the listener with slightly larger imaging and projects a deeper stage. Even with sparsely miked large orchestral recordings the Göbel cable shines with its spatial vastness. However, you only miss this with the Audioquest after a direct comparison with the Lacorde Statement, which also is twice as expensive. Anyway, that is quickly forgotten when the bi-wiring combination enchants you with its tremendously precise, well-differentiated imaging and a hint of warmer timbres. I would love to give the ThunderBird a few more weeks to get used to my listening room, but the FireBird is already scratching impatiently with its claws.