A newb question about loudness

[rgelb]

I am building an app for the Google Android phone and the sounds coming out of its speaker aren't all that loud. I was advised to do the following (see below), but I don't know what it all means. Maybe someone could put it in Audacity terms.

If the primary use case for your application involves sound coming out the speaker, you should EQ your
streams to cut everything below 150Hz (brickwall HP filter), and attenuate everything below 400Hz by 6-9dB. Any energy in that band is completely wasted because the transducer in the G1 cannot reproduce it.

[allencmcbride]

One way to do this is to select "Equalization" under "Effects", and then click and drag points on the line so that it's at the bottom (-30dB) from 0Hz to 150Hz, and then goes up to -6 or -9dB from 150Hz to 400Hz, and then stays at 0dB the rest of the way. --Allen

[steve]

If the primary use case for your application involves sound coming out the speaker, you should EQ your
streams to cut everything below 150Hz (brickwall HP filter), and attenuate everything below 400Hz by 6-9dB.

Upgrade to Audacity 1.3

Use the "Highpass filter" and set it to 48dB per octave, 150Hz.
Then use the Equalizer effect and set it like this:

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