Tim Foust and Geoff Castellucci are amazing bass singers who can sing not only rumbling low notes but beautiful high notes. Their vocal range almost reach to 5 octave and every notes they sing are surprisingly clean.
Tim Foust can sing high note up to all 4th octave in chest voice and can sing down below 1st octave using growl notes which is very strong and resonant. In my opinion, nobody can sing growl note as good as Tim. He often sing 5th octave in falsetto and it is very gorgeous to listen to.
Geoff Castellucci's low chest voice notes especially around mid-high 1st octave are really clear and stable. Geoff recently started to sing unbelievably low notes using technique called "subharmonics" and that is strong and can produce solid sound as chest voice.

I wanted to make this video because they are 2 of the most favorite bass singers in the world. and they have similar range. They are really great and talented singers, so I didn't intend to make this as "battle video" , just comparison of 2 singers.

This video is quite long and I wanted to make more shorter, but after putting videos I really wanted to include, I couldn't cut out any video… so if you don't have time, only watch the part you want to see!
Timestamp→ High notes: 0:16
Low notes: 6:04

[Photos]
Tim Foust
Opening, Ending: http://gare-de-lyon.info/my-favorite-...
High Notes: https://www.pinterest.co.uk/hannah188...
Low Notes: Screenshot from    • Video  

Geoff Castellucci
Opening, Ending: https://www.pinterest.jp/pin/50454396...
High Notes: https://www.pinterest.com.au/pin/4269...
Low Notes: Screenshot from    • Panic! In Four Minutes: Part 1 | Pani...  

[Videos]
   • Tim Foust & Geoff Castellucci Vocal R...