RCA / Cinch Y-adapter (stereo to mono downmix for subwoofer)

prusaprinters

An RCA Y-adapter for stereo to mono downmixing to connect subwoofers with a single RCA input to sources with stereo RCA outputs. The box design is simple and not very fancy.The circuit is inspired by multiple sources [1, 2] and should work fine for most line-level signals in consumer audio. No warranties, though. You will need to re-tune the subwoofer level after installing the adapter. Bill of materials2 male RCA cable ends (approx. 15 cm long)1 female RCA socket with M7 or M8 thread2 resistors with roughly 5 kOhm2 short pieces of flexible cable (about 4 cm each)1 M4x12 screw (M4x10 should work as well)2 cable ties for strain reliefSoldering equipment Build processPrint both case partsInstall the female RCA socket into the bottom part of the caseSolder one resistor each between the positive (center) lead of each RCA cable and the RCA socketSolder one short wire each between the negative (outer shielding) lead of each RCA cable and the RCA socketInsulate blank metal parts with tape, where requiredInstall one cable tie on each RCA cable inside the printed case as a strain reliefPut on the top case and install the M4x12 machine screw to secure it in place Print settingsLayer height 0.2 - 0.24 mmLine width 0.42 mmInfill 25 - 35%4 wall lines5 top & bottom layersSupports enabled (only on build plate)