The carnyx is an instrument which was used by Celtic peoples in various parts of Europe around 2000 years ago. In September 2004 an excavation at Tintignac (Naves, Corrèze district of France) revealed a buried horde of bronze instruments, including a lot of parts of several different carnyxes. Some of the parts have been put together to make an almost complete carnyx which is exposed in Paris nowadays. In 2011, a brass copy of this carnyx has been made by Jean Boisserie. This paper discusses some acoustical aspects of the carnyx brass copy, and presents measurements made on it. The measurements are mainly input impedance, vibrations measurements, and playing frequencies estimations. The question of the bore profile and its influence on the resonance frequencies inharmonicity are particularly discussed. A specificity of the Tintignac carnyx is the presence of thin large ears on its head, their possible influence on the radiated sound is discussed.