You can purchase a fully assembled monoXover from me here.
- 2-way 2nd-order crossover (ie, it can be used with any speaker that has a woofer and a tweeter)
- compact low cost design using easily available parts
- easy to adjust the crossover frequency
- adjustable equalizer for the woofer and tweeter
- can convert stereo to mono, or can select either left or right channel only
- published design you can use and modify as needed