Do I need a sub woofer to match my ATC SCM11s

Can you separate the amp and preamp section on the Hegel? If you can’t do that you will be wasting your money on any sub with a high pass filter option including the JL E110. You can save some cash getting the JL D110 or D108. Since you will be running your speakers full range with any sub you decide to get!

jeres8860,

     Do you have a budget for your sub?

Hi, 

I went to the local Rel dealer and had a listen and it sounded great, was within my budget and like jl35 mentioned, they're not too big. so I went with the t/7i. I wasn't familiar with Rel prior to this endeavor, but the more I learned about them, the more I liked, especially their emphasis on use with hifi. 

Thanks so much to everyone here for all the help, much appreciated! 

Good luck with your new sub !
Please keep us update how did they fit into your system and if they fulfill your your expectations.

Thanks. Will do.