# Does someone know at what frequency an open A string vibrates?

Discussion in 'Miscellaneous [BG]' started by Blackbird, Jan 12, 2002.

1. ### BlackbirdSupporting Member

Mar 18, 2000
California
Is it 220 hz, one octave below A440 or is it lower?

2. ### notduane

Nov 24, 2000
Location
On a "bass", I think it's 55Hz.

3. ### Oysterman

Mar 30, 2000
Sweden
I think so too. No, I don't think, I know it is.

4. ### Gabu

Jan 2, 2001
Lake Elsinore, CA
So B is 31, E is 41 and A is 55

The first jump is 10, the next jump is 14.

140% of 55 = 77 so is that D?

Is so, then would 108 be G?

5. ### allan grossman

Sep 8, 2001
surreal city, usa

So B is 31, E is 41 and A is 55

The first jump is 10, the next jump is 14.

140% of 55 = 77 so is that D?

Is so, then would 108 be G?

You don't have a representative sample - but I like your thinking

The interval between steps in an octave is based on the twelfth root of 2, which means the ratio between a note and a note one step higher is 1.05946309436. If you want to use a rough approximation, 18/17 is pretty close. Since a bass guitar is tuned in fourths, the frequency interval between strings can be expressed as

1.05946309436^5, or

1.3348398541744739198966537767476

which is way too long for our calculations, but if you plug it into the calculator on your PC you'll see it makes sense.

This is the same formula used to place frets - only in reverse.

so -

if B0 = 30.87Hz, then

E1 = 41.2Hz

A1 = 55Hz

D2 = 73.42Hz

G2 = 98Hz

C3 = 130.81Hz

allan

6. ### Gabu

Jan 2, 2001
Lake Elsinore, CA
Thanks for the info! Math doesn't bug me. Cool to know how it works!

7. ### RAM

May 10, 2000
Chicago, IL
Yeah, it works!

There's a neat little trick I learned way back in music theory class...when you raise a note to its octave, it's frequency doubles. So, if an A1 is 55 hz, an A2 is 110 hz.

8. ### John K.Guest

oww, my head... math hurts... oww...

9. ### Rockin John

Dec 20, 2000
Leicestershire, UK.
A tip for the UK bassists. It's something I've done a number of times.

If you've no other means of tuning your bass, listen closely to the hum produced by a flourescent light fitting (assuming there's one available).

The frequency you're listening to is 100Hz. With open G @ 98 Hz, you can tune to that and be pretty close to being @ concert pitch. The band then tunes to the bass

John

10. ### Bassbarbie

Sep 1, 2001
Isle of Wight, U.K
Oh what a clever lot you are!!!

Three cheers for Talkbassers!

11. ### PrimaryTB Assistant

Here are some related products that TB members are talking about. Clicking on a product will take you to TB’s partner, Primary, where you can find links to TB discussions about these products.

May 23, 2022