Check the listing for details. Sharp NEW 4 inch 4 - 8 Watt, 8 Ohm Replacement Speaker for Communication Work. Condition: New. Listed at 15.99 USD. This Sharp SP-1455A NEW 4 inch 4-8 Watt, 8 Ohm Replacement Speaker, is Perfect for Voice Communication Work.This Speaker will work great for both 8 ohm or 4 ohm speaker requirements as found with Collins Transceivers and Receivers.The Speaker measures 4 1/8 X 4 1/8 inches Square, and 2 Inches Deep (from the front to the back of the magnate) It has mounting holes 3 3/8 inch spaced on center.It should fit in most Ham Radio Speaker enclosures and power supplies.Please make sure you measure before you buy. I have free returns but will not pay the return shipping if it does not fit because measurements were not checked.This is a 4 to 8 Watt Speaker so it will handle Voice communications and sound great.They were made for Sharp communication products, so they have a broad range and good sound. This is a great size for external radio speakers and can be mounted in power supplies.I have a limited number of these available. Shipping is free in the USA.