Check the listing for details. Altec 811B Horn & 802C Driver, N-800-D Crossover, Working. Condition: Used, Made in United States. Listed at 800.00 USD. 802C Driver mounted on an Altec 811B Horn, with an Altec N-800-D Crossover. Low and all high frequency connections on the crossover on the crossover were tested and everything works great. Everything works well and sounds good.