I am trying to develop an object that drives away beasts using a low frequency of less than 20hz.
However, there are so many different speakers than I thought, so I think I'll be frustrated after choosing it.
The speaker I want to buy is 10 inches and should be capable of 4 ohms and low frequencies below 20hz.
Which speaker should I buy?
You should buy a speaker with big 1-way Xmax at 100 percent of BL, and EBP have to be ideal for closed box. Then you can design a vented box with Fb way under 20 Hz paired with a Vb that gives you ideal RMS power handling way under 20 Hz (even down to 10 Hz at every frequency), or a closed box with a Vb that gives you ideal RMS power handling down to 10 Hz.
The vented box will sound louder, will have no phase problems, but the closed box will be tiny at outer dimensions compared to the vented one, and will sound more clear / faster.
Here are some examples:
At these woofers you can find my shared projects under "projects" tab. I wrote there descriptions too.
I hope this helps you,