I build cabinet in size similar to old 2x15 Fender Cab, 2cm birch plywood. Impedance is 4 ohms. In this moment only amplifier I can use for testing is little single-ended Bugera V5 (also by Thomann). I didn't expect much from this combination, but because of big sensitivity (103.4 dB) of speakers, this little amplifier sounded anything but little! Sound of these speakers are lush, with big low end. Top-end is kind of mellow in a good way. With bridge pickup on telecaster speakers just sing with pure old american style sound. Very good speakers, reasonable price. They work wonderfull even with such a small 5-watt amplifier. Recommended!