Crossover Upgrade for Micca MB42/MB42-C Speakers (MKIII) | Micca Store
Amazon.com: ACEIRMC 2pcs 400W Adjustable Multi Speaker Treble/Bass 2 Unit Audio Frequency Divider 2 Way Crossover Filters Updated Version (2pcs) : Electronics
Crossover upgrade on 40 year old Fisher speakers. : r/diyaudio