how many hz in an octave?

xstephanx · 11th February 2005, 06:14 PM

Currently trying to estimate some room gain effects(to get a rough idea) from a graph in winisd, problem is i dont know how many hz are in an octave, I know that room gain (pressure vessel) starts at 70hz for me. So yeah how many hz per octave? I decided that 6db/oct. is a good conservative estimate as a room does have losses.

Oh yeah...

I ORDERED THE ATLAS!!!!

wish me luck in enclosure building!

Tim__x · 11th February 2005, 06:21 PM

Octaves are relative, one octave up is double the frequency, one octave down is half the frequency. There's no fixed number of hertz between octaves.

keyser · 11th February 2005, 06:28 PM

converting that to music.... how many hertz is a low C on a grand piano?

azira · 11th February 2005, 06:44 PM

How low of a C? 7 octaves on a piano, 3 above the middle octave, 3 below the middle octave. So, 440 Hz middle a goes down to 220, 110, 55Hz. So your low 'C's are a few Hz above those frequencies.
--
Danny

simon5 · 11th February 2005, 09:36 PM

If room gain start at 70 Hz for you, then at 35 Hz you'll be at +6 and at 17.5 Hz you'll be at +12.

You could draw a straight line in your head on the WinISD logarithmic scale, starting at 70 Hz and going to -12 dB at 17.5 Hz.

So if your subwoofer is following this straight line, room gain will bring it even.

Vikash · 15th February 2005, 01:16 PM

search the site and all shall be revealed

:Room gain

11th February 2005, 06:14 PM	#1
xstephanx diyAudio Member Join Date: Oct 2004 Location: t-dot, canada	how many hz in an octave? Currently trying to estimate some room gain effects(to get a rough idea) from a graph in winisd, problem is i dont know how many hz are in an octave, I know that room gain (pressure vessel) starts at 70hz for me. So yeah how many hz per octave? I decided that 6db/oct. is a good conservative estimate as a room does have losses. Oh yeah... I ORDERED THE ATLAS!!!! wish me luck in enclosure building! __________________ CREEEAAAAAMMMMM CHEEEEEESSSSSSEEEEEEE!!!!! EEEEESSSSEEEEEEHC MMMMMAAAAAEEEERRCCC!!!!

11th February 2005, 06:28 PM	#3
keyser diyAudio Member Join Date: Oct 2004 Location: The Netherlands	converting that to music.... how many hertz is a low C on a grand piano? __________________ "Convictions are more dangerous enemies of truth than lies" - Friedrich Nietzsche Cardioid-like + Waveguide 2-way

11th February 2005, 09:36 PM	#5
simon5 diyAudio Member Join Date: Nov 2004 Location: Québec, Québec	If room gain start at 70 Hz for you, then at 35 Hz you'll be at +6 and at 17.5 Hz you'll be at +12. You could draw a straight line in your head on the WinISD logarithmic scale, starting at 70 Hz and going to -12 dB at 17.5 Hz. So if your subwoofer is following this straight line, room gain will bring it even. __________________ DIYaudio for President !

15th February 2005, 01:16 PM	#6
Vikash diyAudio Moderator Emeritus Join Date: May 2003 Location: UK	search the site and all shall be revealed :Room gain __________________ "The human mind is so constituted that it colours with its own previous conceptions any new notion that presents itself for acceptance." - J. Wilhelm. (But I still think mine sounds better than yours.)

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11th February 2005, 06:21 PM	#2
Tim__x diyAudio Member Join Date: Jun 2004 Location: Edmonton area, Alberta	Octaves are relative, one octave up is double the frequency, one octave down is half the frequency. There's no fixed number of hertz between octaves.

11th February 2005, 06:44 PM	#4
azira diyAudio Member Join Date: Dec 2003 Location: Near Seattle	How low of a C? 7 octaves on a piano, 3 above the middle octave, 3 below the middle octave. So, 440 Hz middle a goes down to 220, 110, 55Hz. So your low 'C's are a few Hz above those frequencies. -- Danny

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