Is a midrange speaker a subwoofer?

[Jason Kandola]

hi there i'm new when it comes to subwoofers and would like to get one but i would like to know if a midrange speaker is a subwoofer for example this one

Link
https://www.amazon.ca/Rockville-RM68PRO-6-5-Inch-Mid-Bass-Midrange/dp/B00LIRT47Y/ref=sr_1_1?ie=UTF8&qid=1504230042&sr=8-1&keywords=6.5+inch+subwoofer+8+ohm

 

[bananaforscale]

No. A subwoofer reproduces only the lowest bass (I'd say up to 60-ish Hz max), and you need a low-pass crossover for one. You basically need a big element with a strong magnet, and after that either a big enclosure (several cubic feet) or active correction, and maximum possible sound pressure goes up as the element area or amplifier power go up. FWIW, I have a 10" Peerless XLS-10 in a 5 c.ft. enclosure and the maximum SPL is in the ball park of 104 dB, ignoring room effects which add 12 dB / octave below the lowest standing half wave (~50 Hz in my case). Granted, the -3 dB point is at 18 Hz...

The short answer to your question: no. Long answer: study and don't get fooled by marketing, you can't get low bass and high SPL in a small enclosure or for cheap. There are ways to circumvent physics (e.g. passive radiators) but you can't override them.