Speakers can also instantly kill Zombot Multi-stage Masher as shown here at 3:08. To do this, have a Breakdancer Zombie toss the Zombot on rap stage twice. Toss the Breakdancer Zombie at two-second interval so it will not get tossed away from the lawn. If done right, use Power Snow more frequently until it reaches the metal phase (since shockwaves are never launched in the third and fourth phase). It will then be killed instantly if one of the five speakers adjacent to the Zombot's original position is still present.
Shockwaves generated by the speaker and Hair Metal Gargantuar are different from each other. The shockwave generated by the speaker can send all plants and zombies it hits flying to the left of the screen while the shockwave generated by Hair Metal Gargantuar's guitar can only hit one plant (two if he slams a plant that is extremely close to him, i.e. the player places a plant in front of him) and does not harm zombies.
During the fifth and last phase, speakers launch shockwaves the most often.
Additionally, in the first and second phases, speakers fall and launch shockwaves at a steady rate.
Speakers never fall in the second and fifth phase, while speakers never launch shockwaves in the third and fourth phase.
Despite being an underground plant, an unarmed Primal Potato Mine can be harmed from speakers.
Interestingly, speakers that fall from the top will never activate shockwaves. Only the speaker that is nearest to the Zombot will do that.