A used pair of NHT 2.9's or 3.3's. The 2.9's with their side-firing 10" sealed woofers reaches down to 20 Hz in-room. I know, I have a pair. The 3.3's with their 12" woofers obviously go a little deeper. Both can be purchased for a lot less, and definitely weigh a lot less. The 3.3's will give those Focal JM Labs Utopia's a hard run for their money.
Preamp | Amplifier: Pass Labs XP-20 | Odyssey Stratos Monoblocks
Analogue Sources: Nakamichi DR-1 | Technics SL-1700MK2
DAC | Digital Sources: Auralic Altair G1 | JVC XL-Z411
Speakers | Subwoofers: Magnepan 1.7i | SVS PB-1000 Pro x 2
Power Conditioning: Blue Circle Audio | Monster HTS 5000
Cables: Wireworld | Pangea Audio | AudioQuest