SVS PB-1000 Pro Subwoofer

It’s been nearly nine years since SVS introduced its beloved PB-1000 subwoofer, a beefy little overachiever that exemplified the company’s approach to bass, and in many ways served as the template for all the bigger and pricier models that followed. Loathe as I am to lean on clichés of this sort, that model’s popularity and longevity indicate that there was nothing fundamentally broken about it. Far from it. So what was fixed in the upgrade from PB-1000 to the new PB-1000 Pro?