This brings the compass of the basset horn to a range of four octaves from , actual sounds .
Like the basset horn, Streitwolf's instruments had the four chromatic open keys extending the compass downwards to B♭.
It is not a horn, but bears the same relation to the oboe as the basset horn does to the clarinet.
The bore of the basset horn is wider than that of the alto clarinet in E♭, or of the tenor clarinet in F.
Like the clarinet, the basset horn is a transposing instrument, its music being written a fifth higher than the actual sounds.