Dayton AudioDAEX19CT-4 Coin Type 19mm Vented Exciter 5W 4 Ohm

I bought these to use as the third round of drivers in a custom Bone Conduction Transducer headphone setup. Long story short, they're part of an experiment to reduce the absolute SPL experienced at the tympanic membrane in a monitoring situation where hearing damage is a concern. As for how they perform in that role, more data must be collected... but for casual use as a BCT, these are bordering on overkill. Depending on how they're driven and where they are placed in this context, it is possible for the listener to experience more low-frequency vibration than one might call pleasant. But as long as the volume knob is kept in check, they do the job well.In a more traditional tactile transducer roll, these units perform surprisingly well for their size and power requirements. Place them on a variety of surfaces for never-ending amusement at what random objects you can turn into a speaker. Wood table top? Sure! Cardboard box? Amazing! .500" polycarbonate panel? ... eh... not so much.

Very nice product, makes a speaker out of any object

Using them on my sim racer. Mounted them to the base of the foot pedal plate, and turns them into speakers.

I use this for my sim ring, it sits stationary on a frame being held by its own adhesive. This thing had completely torn itself from the base and was just hanging from its own wires, adhesive side still stuck to frame. I use my sim rig maybe once a week for an hour.

Defective out of the box. New ones sent out 3 of the 4 were defective seller refused to give a refund. Had to buy better quality from an established company.