It states that it shouldn't be a problem for any well designed amplifier. But does dip into the sub 4 ohm range. I just was not sure about that part. To my untrained eye, it looks like a good portion of that graph rides on the 4 ohm line which started my question. If that was a 4 ohm speaker, I was under the impression that it was bad for a mid range AVR.
You have to define what "a 4 ohm speaker" is....Ridiculous as it sounds, there's manufacturers that might define that graph as 8 ohm or 6 ohm nominal. Yes I'd call it a 4 ohm speaker, but there's "8 ohm" speakers which present more difficult loads on a whole, and there's "4 ohm speakers" that would be better off being called 3 ohm or 2.5 ohm.
The thing to notice, is that the phase angles stay within 45 degrees and the response barely if at all goes below 4 ohms. Sensitivity is average at 87.5 ohm. It's not an "easy load", but it's not an amp killer load either. More power
wouldn't hurt but your pioneer
should drive it regardless.
Where you wanna raise an eyebrow, is if phase angle goes higher (or lower) than +/- 45 degrees (and that coincides with a low impedance at the same frequency), or if impedance drops below 3 ohm between 20hz and 500hz or so, or if sensitivity is below average.
Overall what you're seeing is a very typical loudspeaker impedance profile. If the receiver won't drive that speaker, then you likely need a new receiver, :
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