Ok...old topic...but...
I am looking for a loud sound system for this williams e7...err's current railsounds setup to my ears has 'low'volume output even at max volume.
Is there an alternative or a way to boost the volume using existing parts within the hobby?
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What are you using for a speaker - fatboy or original Williams? Where is it aimed - rails or into shell? Did you make an enclosure for the speaker?
Fred
Fred is right, first step is to deal with the speaker, that will usually give you a significant volume boost over a plain speaker without a baffle. Regardless of the size or quality of the speaker, a good baffle will do wonders for the sound volume, and it'll also enhance the bass response.
If you really want a "loud" sound system, my suggestion is two 5W speakers with a proper baffle and a small booster amplifier. Here's a likely candidate, eBay: 192163691131, TDA2030A Audio Amplifier Module Power Amplifier Board AMP 6～12V 1*18W
You will need a 12VDC power supply good for about an amp for max volume. On the right is eBay: 261125231774, AC DC TO DC Buck Converter Step Down Module, a nice match for this amplifier.
10-12 watts of power should solve your volume issues. 
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