TL;DR If you need to hook up more than one amp to a DAC the best/right way to do it is to buy a switcher. I will list the best units below for balanced XLR and se RCA. It is not safe for DACs to daisy chain amps via “PASS” jacks on the amps from one output in the DAC. Read this thread to find out why. Balanced XLR: custom number ins/outs custom high quality from Mapletree Audio available with any number of ins/outs. This is probably the best most transparent option. But not confirmed. This uses a Grayhill switch and gold plated amphenol XLRs with point to point wiring LR-1 Pro “LR 1 Pro Line Router - This is a balanced signal version of the LR 1. The standard model can switch up to 3 inputs and 3 outputs. Additional I/O can be accommodated using special multi-deck rotary switches. XLR connectors are Neutrik gold-plated type with locking tabs on the female version. switches are Lorlin or C&K enclosed rotary types with silver-plated contacts, and wiring is silver-plated stranded copper with Teflon insulation.” Goldpoint 1 in/out 2 in/out (this is the next best option) Nobsound 1 in 3 out Nobsound 3 in 1 out SE RCA: Custom number of ins/outs custom high quality from Mapletree Audio available with any number of ins/outs LR-1 “LR 1 Line Router - The standard version is designed to switch one of up to three input stereo signals to one of up to three outputs. Other configurations are available to handle up to 6 inputs and/or outputs. Chassis sizes are chosen to accommodate the required I/O connections. As with all the Mapletree switching components, RCA jacks are high quality gold plated with inside and outside hex nuts, switches are Lorlin or C&K enclosed rotary types with silver-plated contacts, and wiring is silver-plated stranded copper with Teflon insulation.” Decware Zen Switchbox 2 in/out 4 in/out i don’t know if the 2 both input/output the signal or what you should inquire. Maybe it could be turned into a 1 in/out 5 in/out box. “Audio is a game of hearing your gear sound only as good as the weakest link in the chain! This box is guaranteed to not be the weak link in your audio chain, even with interconnects costing thousands of dollars. The reason for this is simple. High mass steel chassis, pure silver /Teflon wire, silver switch contacts and hand soldered point to point with silver solder.” The AliExpress and Goldpoint units are probably the next best. But not confirmed. 1 in/out 3 in/out (it’s passive so you can you can use these either direction) these 2 are the best, available on AliExpress in wooden or metal enclosures. The metal is probably better for SQ and cheaper. Wooden version Metal version 1 in/out 4 in/out Goldpoint SW4 2 in/out 4 in/out Beharesford clone on Amazon —————————————————- 4 in 1 out switcher and passive preamp Goldpoint SA4 —————————————————- I posted this question in the general advice thread but got little feedback and I decided that since so many amps especially the popular drop amps have “PASS” jacks, I figured it would be helpful for more people than just me because if those pass jacks are there, a lot of people are going to be using them and given the prices of the drop amps a lot of those people will use them and not have a lot of technical knowledge. I am borrowing a Schiit Gungnir A2 MB usb5 from a kind local SBAFer running it via usb and SE until I get XLR cables and a pi2aes. I had 3 amps daisy chained to one RCA output on the Gungnir. Which a few people here said was ok to do or use an RCA splitter like this one. but after a week or so of turning on the amp. It suddenly started distorting badly. I contacted SCHIIT and they said it was because of daisy chaining amps to one output and I should instead use one amp per output. here’s my email to them and their response. ——————— Schiit, I’m borrowing a friend’s Gungnir A2 gen5 usb (not sure if you recognize A1 and A2 so if not then it’s a “more recent model”). It’s still under warranty. I’m using the RCA se output until I get some XLR cables in. I have it running 3 amps but no splitter cables or switch boxes. The first two amps are the massdrop 789 and Liquid Carbon X which both have SE PASS RCA outputs so I’m stringing the 3 together. I never use 2 headphones at once but I do have 2-3 amps on at the same time occasionally. I’m using an iPod 7 with cck adapter as source via usb. So it sounded fine for about a week. Then I unplugged my iem’s and plugged in an ortho into my SOHA1 (3rd amp at the end of the daisy chain) and it was super distorted. I thought the tube finally went bonkers in my SOHA1 but when I checked the other amps they all sounded distorted as well. Heavily distorted like blown headphone drivers. I then switched to my massdrop Airist R-2R DAC and there was no distortion. I turned off the gungnir for a few minutes and turned it back on and the LED on the furthest to the right was blinking for about 30 seconds which it didn’t do when I first turned it on. I don’t know what this means. It has been running pretty hot the whole time, as hot as my SOHA1, and I think I remember reading other people say that their Gungnir’s and Yggdrasil’s ran cool or luke warm. I’m writing you for my friend since it happened on my watch. But I haven’t touched the Gungnir since setting it up and first turning it on. It went from sounding fine to super distorted without anything changing except me switching headphones which I had previously done with no problem. Any ideas? Is it overheating? Does it just need to be sent in to you? Thank you! ———————————— Reply from Schiit: “You shouldn't really daisy chain amps to it. The Gungnir has 3 outputs - 2 RCA and 1 XLR. You should really be using them like that, otherwise it will cause distortion and draw power from the DAC. “ ————————- These are passive connections and work even when the amps are off. Does an amp simply being on really draw power from the DAC? I have my RDAC setup the same way and no distortion. if I ever own a gugnir I’m planing on using the XLR output with a Passive switch box but I don’t have the XLR cables yet. So does anyone know whether Schiit’s response is accurate about daisy chaining amps via the PASS jacks? If so I think a lot of people are making this same mistake. BTW, after reading Schiit’s response I bought this RCA switcher. Any thoughts on whether this is a good unit?