Upgrading SVS 4000 Subwoofers to SB16 Ultras

I upgraded from an SVS PB4000 and PC4000 combo that I was running in sealed mode, to a dual SB16-Ultra pair. I both wanted to see how much more headroom I could get and what the differences, if any, there were to be heard between 'sealed mode' of the ported drivers, and a true sealed sub.
Equipment Used:
iPhone X
Shure MV88+ Mic: https://amzn.to/2PUyPIK
Polk Audio LSiM707 Speakers: https://amzn.to/2NQxTCg
Polk Audio R50 Speakers: https://amzn.to/2E1XfJ4
Yamaha RX-V2085 Receiver: https://amzn.to/2JUfWBE
Monolith 3x200 watt Amplifier: https://amzn.to/2NQty2d
Monolith Interconnects: https://amzn.to/2Np0qA3
Custom Speaker Wires:    • How To Make Top Quality Speaker Cable...  
Various Acoustimac & GIK Acoustics absorption and diffusion panels: https://amzn.to/2JUOjby
Synology 1019+ NAS: https://amzn.to/31h10mY
Seagate IronWolf Drives: https://amzn.to/32jV6D4

Recorded in Pure Direct, straight to and from camera. Source, Amazon Music HD over Airplay at CD Quality. YouTube does not support more.
Sound Demo videos are not monetized by me, all proceeds go direct to the respective copyright holders.

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