1st quartet 1815-55
- 1st violin: Karl Friedrich Müller (1797-1873)
- 2nd violin: Franz Ferdinand Georg Müller (1808–1855)
- Viola Theodor Heinrich Gustav Müller (1799-1855)
- Cello: August Theodor Müller (1802–1875)
2nd quartet 1855-71
- 1st violin: Karl Müller Berghaus (1829–1907)
- 2nd violin: Hugo Müller (1832–1886)
- Viola: Bernhard Müller (1825–1895)
- Cello: Wilhelm Müller (1834–1897)
Berlioz commented that they had 'la grandeur, la force, la verve et la passion' (Memoires ch 51 1st trip to Germany (1841-2) 6th letter)
The members were originally from the orchestra of the Braunschweig Opera which, with Hamburg and Munich, was one of Germany's top three opera houses in the period 1750 to 1850. Braunschweig (Brunswick) was the capital of the Duchy of Brunswick-Lüneburg, later absorbed into the Kingdom of Hannover (1814-66).
In his autobiography, ch 4, pp80-84 Auer (1845-) describes his time as substitute leader of the quartet (1860s), calling himself "the young and savage Hungarian leader". He got on best with the cellist Wilhelm (b.1834)