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Bi amping question

Hi there,

I have some no-name old speakers which should support bi amping, on the back there is this
 type of terminal https://www.parts-express.com/parts-express-bi-amp-speaker-terminal-cup-gold-banana-binding-post--260-281ost--260-281
When I remove those connections between bottom and top posts and plug amplifier to bottom posts, only bass is playing. Which is good I suppose. 
But here is the problem, when I plug amp to top posts, speakers play fullrange ?? Shouldn't only mids and highs be playing ?

I assume it is not safe to bi-amp them right now.
What do you think ?

Thanks

peterb999
peterb999 OP
4 posts
 
http://imgur.com/gallery/Cx6bSfa
These are those speakers. They are 3way.
They definitely play full range when hooked up to upper posts as the bass speaker is moving and low bass are present.
Thanks

Post removed 
peterb999 OP
4 posts
 
@mental Maybe... So does anybody know if it's safe to bi-amp in this case? I thought upper posts would drive only mids/highs which isn't the case. Curiously lower posts drive only bass section :/
Post removed 
wbs
77 posts
 
Use a VOM to check the resistance between the two sets of posts.  If they aren't isolated from each other you don't want to try biamping as the two amps will interact.
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