The sensitivity of two π speakers is 95dB/W/M. We can ship to Germany using surface parcel post with insurance and the rates are pretty good. It takes 6-8 weeks to get there that way, but the price is right. If you need it faster, we can use an air carrier, but it is expensive.The standard two π kit comes with an Alpha 10 woofer, Vifa DX25 tweeter, Dayton non-inductive resistor, Solen cap and a Jantzen coil. The upgrade kit has just a tweeter, cap and resistor and is used to upgrade older models that had a KSN1038 tweeter. It isn't required when purchasing a new kit.