They aren't without their problems, though. Most earplug speakers are of the custom-molded variety, which requires seeing an audiologist to have a mold made, and waiting weeks for the speakers to be built - at a VERY high cost. Universal-fit earplug speakers work great without a helmet on, but the helmet will often cause pressure on the speakers making them very uncomfortable.

Finally, we've found a universal speaker that is small enough to be worn comfortably under virtually any helmet, with no need to sit for custom molds or wait weeks for delivery - and best of all, they won't break the bank!

The S-Plug Universal Earplug Speakers feature a very compact speaker element, with a slip-on, replaceable earplug assembly. When inserted into the ear canal, literally nothing but a thin cable extends through the outer ear! You'll have no problems with headset pressure causing discomfort with these little speakers. And, you're not giving up any performance - We tested the audio quality in a quiet room, with a CD of dynamic music. We compared these speakers with a variety of in-ear and over-ear speakers (none of which would have a chance of fitting under a helmet), and the S-Plugs gave as good as or better sound quality than all but the biggest over-ear models - and even compared to those large headphones, the S-Plugs had nearly as good music reproduction and at least TWICE the apparent volume with the CD player at an equal volume setting!