Klarinet Archive - Posting 000081.txt from 2010/08

From: Nitai Levi <clarnibass@-----.com>
Subj: Re: [kl] speaker bushes
Date: Fri, 13 Aug 2010 03:51:09 -0400

>> What is a speaker bush?=A0 Is this a proper term?

>> I tried searching the Klarinet archives for speaker =

>> bush, but mostly came up with... =

It's sometimes called the speaker key but more often register key. The bush=
for =

the register hole is most often called tube. So register tube is the most c=
ommon =

name. Speaker bush is a very rare term used for this. But terms can be diff=
erent =

between countries, etc. (e.g. neck/crook).

>> Oh dear.=A0 Chimneys and bushings.=A0 My tonehole for the thumb has a
>> metal chimney.=A0 The other chimneys are not metal.=A0 The metal bushing
>> for the register key has a hexagonal border with a toroidal inner portio=
n =

>> that I guess forms the seal for the hole.=A0 What is up with the hexagon=
al =

>> form of the speaker hole bushing?=A0 I am looking at a Selmer CL210.

Re bushings in general, usually the thumb one and the register tube=A0are m=
etal =

and others are most often a type of plastic. Like someone said, some of the=
less =

expensive models have them, instead of one piece body and chimneys, but act=
ually =

some of the more expensive models can have them too. If done well, there's =
no =

real difference except they can leak, which can happen but is=A0very rare I=
ME.

The hex shape on the outer part of some register tubes is so it's easier to =

remove. There's a flat part to hold, or if the tube is threaded, you can ev=
en =

use a hex key (actually the opposite of a key, with the hollow side, don't =
know =

the name in English).

>> From this and experience with my own clarinet, I am guessing =

>> that "speaker bush" refers to the metal reinforcement around the =

>> hole for the register key

It's not a reinforcement, it's the hole in the metal tube itself that is th=
e =

register hole. The hole in the body is just a "holder" for this.

>> Does this diagram describe just the effect of the speaker hole
>> position, a combined effect of the bore diameter and speaker hole
>> position, or does it simply approximate the variation in width of
>> 12ths along the range of the clarinet.

You're right that the article could be clearer. The diagram=A0shows just=A0=
the =

effect of the register hole on tuning of the second register. It isn't =

completely clear, but safe to assume they are talking about the effect=A0it=
has =

on=A0what they mentioned previously i.e. a normal bore size of about 14.5mm=
-15.3mm =

with close 12ths. But maybe this effect is independed of bore size anyway. =
They =

don't really give a lot of details about the register tube so you can look =
more =

into this from other sources if you are interested. A simple way to check i=
s to =

play the long B and then play it again but instead of the register key, pre=
ss =

the side Bb key (second from top side trill key). This is one example of th=
e =

effect of register hole position, size and=A0length on a note.

By the way re undercutting tone holes mentioned in the article, recently th=
ere =

an article in an oboe journal about this and other effects. It was summaris=
ed =

and posted (in his own words) by an oboe specialist. I will ask if he minds =

posting it here too.

I also noticed Ken Shaws reply here. It is so strange for anyone to self pr=
aise =

themsevles, in any situation.

=

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