Im playing right now with their 1201 driver. It goes down to an F3 of 21.88 in a 113L ported cabinet tuned to 20Hz. It cost only 91 bucks. This seems rather good. Good bass at low cost. On the other hand I'm aware of the price of their 03 series, for example their 1503, which can do as well as a Tempest but using a smaller enclosure. So if cost is important a Tempest will go as low for much less (driver cost) and with less amplification (less amplifier cost also). I feel this is why a Tempest is different, no "better or worst". But I can't understand the same about their 1201 against a Shiva. Im still a newbie in all this matters, but can anyone explain to me why are this drivers not as popular as Adire ones?