I'm not JA but I'll try to give you a hand.

Generally, when you partner a high-output impedance tube amp, with a loudspeaker that has a Z (impedance) curve that looks like the Himalayas, you get unpredictable results (actually, the results are predictable, just predictably bad). You will have good 1-3dB deviations from flat due to the interaction between the amp and speaker. For many, that coloration may sound good/bad depending on the recording and the original FR of the loudspeaker. It certainly isn't accurate in terms of the original voicing of the loudspeaker.

If you want to use a high output impedance amp, look for a loudspeaker that has a very well behaved Z curve. It is fairly trivial to achieve in the loudspeaker design. The double peaked impedance peaks around the tuning of a ported enclosure are another matter and for amplifiers with high output impedance, the bass tuning of a loudspeaker almost becomes part a variable that changes from situation to situation. The room and placement have a profound effect too so it just throws yet another variable into the situation.

Quote:
I am considering purchasing the 1037's after hearing them at a shop. I already own a Moscode 401HR amp, and I wonder how the two measurement related comments below will affect the sound? The last thing I want is an amp/speaker combo that accentuates highs. I am selling my current speakers because I find them too bright for my tastes.

The Focal Electra 1037 Be was significantly more sensitive than normal at an estimated 90dB(B)/2.83V/m. However, its plot of impedance magnitude and electrical phase (fig.1) indicates that it is a demanding load for the partnering amplifier in the lower midrange and bass. Not only is there a minimum value of 3 ohms at 33Hz, but there is a combination of 4.25 ohms and