Summary: My Orion 2150sx amp doesn''t have an internal crossover. I was using the crossover in my pioneer receiver but it didn''t satisfy me. I had heard audiocontrol is one of the best companies for crossovers. After installing the 2xs I am convinced. This is one of the best crossovers you can buy. If you pay retail, it is a bit expensive but worth every penny. The bass is a lot tighter with this crossover. The crossover chips can be replaced with any frequency you want. Try it with the 33hz subsonic filter and 90 hz low pass first before you make any adjustments. I would recommend it for anyone that wants quality bass or louder, cleaner bass.