Check the listing for details. Crossover PCB set for the AlTi DIY speaker design - PCB Board Kit. Condition: New. Listed at 12.50 USD. Custom printed circuit boards designed for the crossover of the AlTi DIY speaker design. *Updated for the 2021 Crossover Revision - now includes daughter board for the additional LCR network on the woofer which further improves the frequency response* Take the guesswork out of crossover assembly, these boards make the assembly process quick and straightforward. The boards measure 4.25" x 5.5" & 2.8" x 2.8", they feature large solder pads and copper traces for great electrical connectivity. Note photos of fully assembled crossovers are for reference only. ***Listing has been changed from a pair of PCB sets (pair of speakers) to a single PCB set (single speaker) in order to allow purchase of them in individually or if odd numbers are required*** Includes: 1x set of crossover PCBs for the AlTi speaker design. 5x Terminal blocks which accept up to 12 gauge wire. 8x Snap in PCB standoffs. 8x Mounting screws (screw finish may vary). Requires: Crossover components for the AlTi speaker design. Compatible components tested for fit on this PCB: C1 - 4uF - Dayton Audio DMPC-4.0 C2 - 1.5uF - Dayton Audio DMPC-1.5 C3 - 0.22uF - Dayton Audio DPMC-0.22 C4 - 12uF - Dayton Audio DPMC-12 C5 - 80uF - Parts Express 80uF Electrolytic Non-Polarized Capacitor C6 - 22uF - Parts Express 22uF Electrolytic Non-Polarized Capacitor L1 - 0.4mH - Dayton Audio 0.40mH 20 AWG Air Core -or- Jantzen Audio 0.40mH 20 AWG Air Core L2 - 1.5mH - Dayton Audio 1.5mH 18 AWG I-Core -or- Erse Audio 1.5mH 18 AWG I-Core L3 - 2.0mH - Dayton 2.0mH 20 AWG Air Core -or- Jantzen Audio 2.0mH 20 AWG Air Core R1 - 8 Ohm - Dayton Audio DNR-8 -or- 8.2 Ohm 10W wire wound resistor R2 - 7 Ohm - Dayton Audio DNR-7 R3 - 20 Ohm - Dayton Audio DNR-20 -or- 20 Ohm 10W wire wound resistor R4 - 10 Ohm - Dayton Audio DNR-10 -or- 10 Ohm 10W wire wound resistor Assembly: Glue components to the correct positions on the board (hot melt glue works great). Secure inductors with non metallic cable ties. Solder components leads to the pads on the bottom of the board. Attach wires from input and drivers, daughter board is wired to the LF output of the main crossover board along with the woofer. Mount crossover boards.