My sub was making a horrendous robotic noise, like a loud scraping rattling sound

Plus, if you're used to that extra sound, you will want to add a good sub

Love the sub out.

Connected my sub to it for extra bass, but sounded amazing regardless

Coupled with a nice sub (I got the R10 to go with these) these things pump out really beautiful, clear sound

Probably would be even better with a sub woofer but still good without.

My sub was making a horrendous robotic noise, like a loud scraping rattling sound

Amazing add the 12 sub

Could do without a subwoofer for most TV listening, but if you already own a sub, easy to connect