I purchased 4 of these subs from Sonic electronix (they were great). 2 subs acoustically paired in same chamber of a still quite small box (4 cuft total). Running 200 RMS to each one I really sound like I have thousands of dollars in my Honda Passport! I am using a HiFonics Amp Brutus. Amazing--Boston Acoustic is up there with the audio gods as well! Sound quality is wonderful.