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 Cables You...   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. How To Place Speakers:    • Master Set & Rational Speaker Placement Ho...   Polk LSiM707 Unboxing:    • Polk LSiM 707 Unboxing And Overview   Polk LSiM706 Unboxing:    • Polk LSiM 706c Center Channel Speaker Unbo...   Polk LSiM702 Unboxing:    • Polk Audio LSiM 702 Unboxing Overview And ...   Polk LSiM707 Review:    • Polk Audio LSiM707 Tower Speaker Review vs...   Monolith 3x200 Amplifier Review:    • Monoprice Monolith 3x200 Amplifier Unboxin...   Streaming Services Comparison:    • Which Music Service Is Best For You Amazon...   As an Amazon Associate I earn from qualifying purchases.