Hi this is a very good basis of discussion
There is a magazine that gives class A, B, C and etc. to reviewed speakers on the basis of their opinion on their sound quality
They split speakers in full range and limited range if i remember well They are right They are two worlds apart
I am sure that this speaker cannot be used full range at realistic levels without issues
The evidence ? just play a track with low Hz instruments like pipe organ at good level and listen
There will be distortion for sure The distortion you see in the graph plus the IMD caused by low frequencies and mid frequencies playing at the same time
I have spent years listening to small speakers The first time i listened to a JBL monitor with a powerful 12" woofer i understand for the first time what music means It was a revelation I understood what i was missing And i was missing a lot indeed
Small speakers sound small
The silliest comment i read is ... great bass for their size

What bass ?