However, that is a rather tall order. A 1 inch speaker is either a small tweeter, or a headphone. It is difficult to put much sound out, because the smaller a speaker, the larger the excursion and the less bass you can get from it.Are you really unable to use a speaker larger than 1 inch? Do you know that you must separate the front and back of a speaker with a baffle of some kind? Even a 300W speaker not placed in a box or baffle will not put out much sound, and will be damaged at relatively low power levels.Here are some 2 inch diameter speakers:2 inch 5W full range:http://www.mcmelectronics.com/product/55-4566&green=1145850990250mm x 90mm 15W full range:http://www.mcmelectronics.com/product/55-46222.5 inch 1W full range:http://www.mcmelectronics.com/product/55-4572Here is a 1.4 inch 1W 8 ohm speaker, however it isn't going to be as loud as larger speakers for the same wattage input and with even less low frequency:http://www.mcmelectronics.com/product/55-4518Finally, here is a 1 inch 1W 8 ohm speaker. Careful, many 1 inch speakers have an impedance considerably higher than 8 ohms:http://www.mcmelectronics.com/product/55-4514The size of the space inside the speaker box, or the size of the baffle will affect how loud they are, and the frequency response.
This one's a little bigger than 1", but it has really good sound.http://www.mpja.com/4-Ohm-Mini-Speaker/productinfo/14618%20SP/