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I'm trying to soundproof one room from noise coming from another room. I won't know how much bass will be generated from the other room until after the soundproof job is done.

So I want to assume the worst case scenario. What is the cheapest way for me to produce the maximum amount of bass? I don't need high frequencies, and I'm not particularly interested in sound quality.

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Well obviously to produce a lot of bass you're going to need a big driver. All I can suggest is trying to track down a second hand sub or bass guitar amp and running ultra-low frequency test tones through them at high levels.

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It might be worth trying some of the non-ultra-low frequencies, too! I believe anything from 200Hz down is considered "bass." –  Warrior Bob Sep 11 '12 at 15:50
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Do you have access to the amp or monitors that will be used in the room you are soundproofing? If so, generate a sine wave sweep in Audacity that goes from 20 Hz to 200 Hz. Loop it. Then crank the volume as high as you can.

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