quality/design of subs are so important. I have 1000 dollar 12 inch car subs that have destroyed 18 inch subs in spl comps...ofc also givig them 3000 watts at 1.5 ohms. when talking about subs, I have no issues when the more expensive subs outperform...ofc I also believe lesser costing subs can come close enough in output. I dont care about +/- 3 db at whatever freq....but if a sub came out with +6 or more db dif I am listening.
Power: Marantz sr7008, NAD C 275Bee x 2, Video: Oppo 103, Samsung 75un6300
Speakers: Focal aria 948, Focal cc900, Klipsch synergy KSF 10.5, Magnepan LRS
Subs: Rythmik FV25HP, Rythmik FV15HP