You can't have too many bass traps...

Nope.

It does take considerable amount of bass traps to improve an enclosed space. If you are unwilling/unable to use EQ you'll need more to get a perfect room, but yes, you can over-dampen not just the bass, but the mid/treble as well.

4 of the GIK acoustics Soffit Traps are a good start for a modest room. 
Best,
E

The trick with bass traps, gentle readers, is knowing exactly where they should go. It helps to have a method to determine the exact location of the standing waves in the room, a test tone and SPL meter or even an empty shoebox will alert you to the standing wave while a test tone is playing by vibrating in the presence of the standing wave. As it turns out sometimes the bass trap should be placed a foot or two away from the room corner. If one puts bass traps around willy nilly without measuring it’s very possible to degrade the sound, fair warning ⚠️ You feel invincible, like the more tube traps the better the sound! 🤗

YES!!

Well you can accidentally kill yourself by drinking too much of something as seemingly innocuous as water, so I’m guessing answer to question is no, as it is 99.999% of time with absolute questions of the sort ; )

Systems-you can’t have too many separate music systems!