If you really need to amplify the PSP’s speakers but can’t be arsed to use a pair of headphones, this new (unbranded?) ‘Amplifier’ will get the job done, but not without increasing the size of Sony’s already just-large-enough design. On the other hand, you can pretend the Amplifier is an old-school modem coupler and that even combo you get in Lumines is hacking another layer of the Gibson.
I was sort of hoping this was going to be a headphone amp that clipped onto the back.
Amplifier [PSP411]