Everyone loves an upgrade. Sunfire is making the move more affordable—free, in fact. The company just announced the “Live Large with Sunfire” summer promotion for its Dynamic Series line of subwoofers.

If you buy Sunfire’s SDS8 8-inch sub this summer, you can upgrade to the 10-inch SDS10 for free. If you want that 10-incher, the company will offer you the 12-inch SDS12 for the 10-inch price.

Each sub features a Sunfire-designed woofer and energy-efficient Sunfire Class-D amplification via the company’s own FFD technology. All three also have a .5W standby power mode.The 8-, 10- and 12-inch subs have an MSRP of 400, $500 and $600, respectively. The optional 2.4GHz subwoofer kit can make any of the above pieces wireless, for a total of $160.

The “Live Large with Sunfire” promotion is available on a maximum of two Sunfire SDS subwoofers, from now through August 31, 2011. The offer is only good on qualifying purchases, so check the company’s website to find your nearest Sunfire dealer or authorized online or brick-and-mortar retailer.

Rachel Cericola - Contributing Writer

Over the past 15 years, Rachel Cericola has covered entertainment, web and technology trends. Check her out at www.rachelcericola.com.