How to fix these?

I had another pair exactly like that Sonys they also outperformed the insignia for bass . But they sounded good when I ran them with each other..insignia are hooked up correctly just have no low bass . Or mid bass under 80hz
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I turned the bass up +10 on the receiver . It’s just by basement system no sub output on this stereo amp
 
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Nope still not much bass at all. They do sound pretty good though. I’m not saying they are junk.
I turned treble down all the way they definitely produce bass . Just I can’t hear it sitting 10 feet away . It’s in the basement. Up close I hear it.
They get good reviews but I don’t have a sub I can attach to this amp. Insignia ns str514
https://www.avsforum.com/threads/insignia-ns-sp213-bookshelves-are-they-any-good.3266027/
it can run two pairs of speakers.
 
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As Cal has said, reversing the +/- (red/black) connections on ONE of the speakers should make a "striking difference" to the level of the bass output.

However, I notice that a customer review of the Insignia NS-SP213 bookshelf speakers mentions the lack of bass output:

"I bought these speakers and hooked it up to a matching Insignia receiver. The sound quality is great and more than enough for a room. However, the speakers could use some more bass. A subwoofer needs to be added if you want more bass. Otherwise, sound quality is good for the price."
 
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However, I notice that a customer review of the Insignia NS-SP213 bookshelf speakers mentions the lack of bass output:
yep agreed!
However, the speakers could use some more bass. A subwoofer needs to be added if you want more bass. Otherwise, sound quality is good for the price."
I may just run them with the Sonys I fixed in this thread they have enough bass to fix the sound. I can’t fit a sub down here unless it’s small. And my amp doesn’t have a sub output. This is a music only system no movies.
Insignia ns str514
Thanks
 
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