I guess impedence is the 'dirty little secret' of the speaker manufacturers. I own Martin Logan Aerius i's which are rated at 4 Ohms (Nominal- that's the White Lie), but the actual impedence drops down to 1.8-ish in the upper high frequency area!! Requested ML to provide the impedence curves and they gracefully declined.
Tube amp and speaker impedence matching
I recently purchased a Conrad Johnson CAV-50 and am actively looking for the "right" speakers. I found a couple of speakers (GMA Europas for one - rated 4 ohm) I would like to purchase, but I am concerned about presenting my amp with an improper impedence match and causing damage. The CAV- 50 is rated "45 watts per channel from 30 Hz to 15 kHz, both channels driven into 4, 8, or 16 ohms". I'm pretty new to all this so any help will be appreciated.