Guide to Bassoon RIBO Low "A" Extension

Ribo Low A Extension for Bassoon

Any bassoon low A extension is an acoustic compromise the bassoon is simply not built or tuned with the
extra length in mind. A traditional cylindrical, thick-walled low A extension typically suffers from an incredibly stuffy
low B in addition to significant tuning and timbre changes throughout the instrument
s range. In addition, when these
types of extensions made of more robust materials (plastic, glass, metal) the extra weight noticeably impacts the
balance of the instrument while being played.

While it is not possible to eliminate these drawbacks entirely, they can be significantly reduced. The
RIBO Low A extensions unique shape and thin-wall construction allow the instrument to speak with less resistance on
low B and significantly lessens other acoustic changes. Furthermore, its light weight (under 20 grams) virtually
eliminates balance or weight concerns.

In order to better fit the wide variety of bassoons that exist today, the RIBO Low A extension is available in
multiple sizes. Best results are usually attained according to the chart below:

Sizing Chart

Each extension is provided with several layers of electrical tape which allow for fine adjustment in addition to
helping create an airtight seal. To ensure the best possible fit, remove layers of tape until the extension can be placed
and removed easily. Additional tape can also be added
for example, if it is desired to use the same extension on
multiple bassoons with different size bells. However, the addition of a many layers of tape will eventually constrict the
bore and reduce the benefits of the extension.

Due to its thin-walled construction, the RIBO Low A extension is susceptible to crushing if handled harshly.
Make certain to adjust it properly
(see above) so that undue force is not necessary to place it in or remove it from the bell.
Store it in a box or other stiff-walled container when it is not in use, and take care not to sit on it.