8-Input Summing Mixer - DSUB TRS or XLR (Select Connection) with 2x Stereo to 4, or 4x Mono Switch
Speck X.SUM 32 channel Summing Mixer
SB2 Passive Summing Mixer Kit – DIY Recording Equipment
A-Designs Mix Factory 16-Channel Stereo Summing Mixer MIX
Wye Box (audio Summing Box) (with Pictures) - Instructables
A-Designs Mix Factory - 16 Channel Stereo Summing Mixer - Professional Audio Design, Inc
Direct Boxes (DI's) with Stereo to Mono Summing | Late Reflections – the Silent Sky Studios Blog
LittleOne 8x2 Analog Stereo Balanced Passive Summing Mixer Box - DSUB, TRS, or XLR - Select Connector type for studio mix
Balanced Line-Level Stereo to Mono Summing Box | Late Reflections – the Silent Sky Studios Blog
Single Stereo to Mono Converter, rca audio stereo to mono adapter summing box
Passive Discrete Summing Mixer 8 TRS in – 4 TRS out with 2xSTM + Gain Control + Master Mono + Direct Monitor switch
RANE Commercial - Knowledge Base
On-Stage DB1050 Passive Multimedia DI Box with Stereo-to-Mono Summing - Bill's Music
DI box with stereo to mono summing | diyAudio
SB2-EN Summing Mixer Box + 2x 8 Channel DB-25 to TRS Cables
How to Build a DIY Passive Summing Box – DIY Recording Equipment
SB2-EN Summing Mixer Box + 2x 8 Channel DB-25 to TRS Cables
8 Ch Summing Box - Variable Headroom + Mono Switch - Select DSUB TRS XLR
Passive Summing Box | Passivmix | Signal Audio Workshop
8-Input Summing Mixer - DSUB TRS or XLR (Select Connection) with 2x Stereo to 4, or 4x Mono Switch
SB2 Passive Summing Mixer Kit – DIY Recording Equipment
Balanced Line-Level Stereo to Mono Summing Box | Late Reflections – the Silent Sky Studios Blog
Single Stereo to Mono Converter, RCA Audio stereo to mono adapter summing box RCA L/R
Amazon.com: On-Stage DB1100 Active Direct Box with Stereo-to-Mono Summing : Musical Instruments
