Im still on the search of something similar to a Tempest but that I can buy in my country. For example, what do you think about this driver?: VEGA 154 Fs 23 Hz Qts 0.359 Qms 4.42 Qes 0.390 Vas 6.40 ft3 (181L) Xmax 38.2 mm (+19.10mm) Voice Coil DC Resistance: Revc 3.4 §Ù Volume Displacement: .26 ft3 (7.36L) I have modeled this driver in Unibox and it appears to be comparable to a Tempest (in the same enclosure and port tuning it goes more or less as low), and since I can buy it for around 160 bucks right here, Im seriously considering it. The other reasonable option I have found is this driver: HED-12.0 Fs 22Hz Qts 0.355 Qms 12.880 Qes 0.365 Vas 6.22 ft3 (176L) Xmax (+-0.67") (+-17mm) 17.0mm Revc 3.6(ea.coil) Sensivity 90 dB Impedance 4 This one is really cheap (79 bucks). In my still very limited knowledge regarding this subject, this appears to be close to a Shiva (but here the Shiva is better in the sense that with the same enclosure and tuning than the HED the Shiva goes lower in its F3). (by the way, Brian Bunge and Jack Gilvey have helped me a lot with this driver, thanks again guys).