I followed the link over to Geeks.com and based on the Regulatory Approvals listed below these speakers must be pretty awesome!
Features/Specifications:
Elan Elios EuroStyle ES412W 4" On-Wall Speaker
General Features:
White color
Two (2) dual active 4.5-inch woofers
Large magnet structure
ABS plastic cabinet
Wedge shape design makes it easy to attach horizontally or vertically
Includes mounting brackets
Specifications:
Bass Unit Dual 4.5-inch mica-filled copolymer
Tweeter: 1-inch soft dome pivoting
Frequency Response (± 3 db): 70 - 20,000 Hz
Nominal Impedance: 8 ohms
Power Output: 75-watts, maximum
Recommended Wire Size: 16 - 18 AWG
Unit Dimensions:
16.5 x 7 x 4-inches (H x W x D, approximate)
Package Includes:
Elan Elios EuroStyle ES412W 4" On-Wall Speaker
Installation Guide
Horizontal mount bracket
Vertical mount bracket
Screw pack
Additional Information:
Notes:
Model: Elios ES412W
UPC: 8 44039 01061 2
Not for outdoor use
Product Requirements:
Home Theater System or AV receiver with speaker terminals
I’m not sure if you are trying to ask if these are comparable to the size of subwoofers (which would be difficult to hang on a wall), or if you are trying to ask if you would need to buy a sub and hang it on a wall since these are wall mountable.
I would consider these to be large size bookshelf speakers that are not drastically heavy. Not too hard to hang on a wall (maybe the proper hardware is included which would make it very easy to do).
As far as needing a subwoofer, if you want proper bass, a proper sub would definitely be needed, but not necessarily hanging on a wall.
Elan speakers are great sounding. I am a dealer and have heard this similar speaker from Niles audio, they are owned by the same company now.
I don’t think you are going to find a speaker at this price range that are going to sound better.