Amazon.com: 6 Ft Castline Gold 3.5mm TRS to 1/4" TS Mogami 2549 Stereo to Mono Summing Cable with Resistors : Musical Instruments
Sescom SES-LSUMTS iPod/iPad Summing Cable Dual 1/4 TS Mono Male to 3.5mm TRRS Male for Apple Lightning Adapter - 3 Foot
The Stereo-to-Mono Summing Cable That No One Makes | Late Reflections – the Silent Sky Studios Blog
Balanced Stereo to Mono Summing Cable with Resistors Dual XLR Female to XLR Male | eBay
Amazon.com: 6 Ft Castline Gold 3.5mm TRS to 1/4" TS Mogami 2549 Stereo to Mono Summing Cable with Resistors : Musical Instruments
Why are two 1 kΩ resistors used for this additive stereo to mono conversion? (For audio inputs to an amplifier) - Electrical Engineering Stack Exchange
Q. What should I buy for Mono monitoring?
2) 12-inch Mono to Stereo summing 1/4" cables. | Reverb