How does the sound of a double bassoon compare to a standard bassoon?

The double bassoon is designed to produce a sound that is one octave lower than that of a standard bassoon. This instrument is essentially a larger version of the bassoon, and its added length allows it to create a deeper and richer tone, effectively stretching its pitch range downwards.

In terms of construction, the double bassoon is made with longer tubing which lowers the pitch significantly when compared to the standard bassoon. This characteristic is essential for composers and musicians who require the deep timbre that the double bassoon provides, typically in orchestral or chamber settings.

The other options misrepresent the pitch relation between the instruments. For instance, stating that it sounds two octaves lower would imply a much deeper sound than is produced. Similarly, saying it sounds at the same pitch or one octave higher contradicts the fundamental design and purpose of each instrument. Hence, the correct choice of one octave lower accurately reflects the role of the double bassoon in musical contexts.