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I've heard some of the SRS technologies work great, there is one called Max-V which is supposed to boost volume levels, but no idea if they will ever get something going with Android.
Lenovo Phones Feature SRS WOW HD, SRS MAX-V
But for now i've heard of the "louder Volume Hack" as well, but no root yet on the Eris. Not really sure how much louder you can get our speaker without blowing it, I've heard a few people complain of blown speakers so.... be careful once Root access is given, dont be too quick to make your volume louder as you may just end up blowing a speaker.