TECHNICAL SPECS:Size (WxHxD):143 x 1040 x 410 mm(300 x 1060 x 470 mm incl. spikes)Weight:23 KgFreq. reponse60 Hz 50 KHzImpendance:>6 ohmSensititity:85 dB 1W 2.83 V/mCrossover:220 Hz and 3.5 KHz 2. OrderEnclosure:Internal vented design Port in rearDrive units:1x sealed ribbon tweeter, 1x 00mmCeramic bass driver, 1x 100mmCeramic mid-bass driverFinish:Black Piano, Maple Burl or PersonalisedAmplification: > 50 W(Though we have seen excellentresults with small tube amplifiers)