The not-so-great thing about Macs is that third-party accessory manufacturers tend to view Apple owners as an ideal market to be milked, at least financially-speaking. Twelve South's BassJump addresses a commonly-voiced problem among MacBook and MacBook Pro owners - that while the mids and trebles are reasonable, the notebooks' bass is somewhat lacking - by offering a standalone subwoofer. Unfortunately the compact sub' also costs $79.99
That gets you not only the BassJump itself but Twelve South's accompanying amp app, which allows you to tweak the equaliser - to rock, pop, R&B, etc - but adjust the sub volume and the crossover. The BassJump speaker hooks up via a USB connection, which gives it both audio signal and power.
As for the sub's specs, it uses a 77mm cone but Twelve South aren't exactly shouting about the wattage, so we're guessing it's reasonably low-key in comparison to some external speaker systems. The BassJump is available now - for MacBook owners only, naturally - priced at $79.99.