Room or speaker resonance???

I received an interesting test CD with Audio Magazine. It has test tones to determine ideal/optimal distance from wall. My measurements are:
50 Hz - -1 dB; 70 Hz - -10 dB; 100 Hz - -6 dB; 140 Hz - -10 dB; 200 Hz - 0 dB; 280 Hz - 0 dB

Is this normal? Seems as huge dip to me?
Is this speaker (say a bad speaker element or bad crossover part) or room or both? How can I tell?
How would I go about to correct?
Thanks