External Linear Power Supplies

You would need a separate power supply for each of these because they have different DC voltage requirements and different connections.

The iFi power supply might be better than some stock power supplies, but it’s still a wal-wart switching power supply. I would avoid it if you can afford the better ones.

If you’re on a budget, I have had good results with the China Teradak linear power supplies. Here is one with a 5V micro-USB cord for the Chord Qutest.

https://www.ebay.com/itm/TeraDak-DC5V-2-5A-Micro-USB-Linear-Power-supply-For-Raspberry-Pi3/183841452...

@elizabeth - that sounds right as the iFi is basically a switching power supply.  I'm sure that's a big reason why melvinjames did not get an improvement with it.

That Massdrop THX AAA unit looks to require a 24V DC power supply, so you are likely going to have to have to have at least two external power supplies because this is a higher than normal voltage for these linear DC power supplies.  Most small devices range 5-15V DC.  Even the 200W Small Green Computer only has a 19V output (unless you can get them to custom build a power supply).

So, either a single SBooster or Teradak for that 24V Massdrop.  Then you could try to find a dual-output power supply for the 12V SugarCube and the 5V Chord Qutest (with special micro-USB connector).

I don't completely know about that.  I suspect that Lab grade units use switching power supplies because everything is controlled from a digital/computer circuit.  I could be wrong, maybe there is a lab unit with linear power supply.

yup, linear power supplies have a break in period just like any other electronics.  It would be anywhere from 100-300 hours based on your system and listening preferences.

searching, here's one that has 2 18V outputs.  It's a variation of the LKS 25W power supply.  It really is only one power supply with two output.

https://www.ebay.com/itm/XMOS-TALEMA-Linear-Power-Supply-25VA-18V-1-5A-Dual-DC-Port-Ultra-Low-Noise-HIFI/182521664344?hash=item2a7f239358&_trkparms=ispr%3D1&enc=AQAEAAADQKvsXIZtBqdkfsZsMtzFbFsbX3WcW5fmB%2Fx7ZbaZTyexcp1Rc6ldAEv%2BvLdC%2BFs7dmQ83S54J8RJow8uNlocGs6ouF18I91SV%2FBq7G%2B6XvBlEHEA1o5KvjmOy7%2FYM4k3%2B6Z%2FNhbirOyxREWqdrHkOHSO4fIlXfX7Wk%2Fpmne7LveE6wt249gfhI%2FccU8%2B6WEoXf6GOJ3hWQJQIZ4WJhIwu3OQEmhfX4fI6%2FyFA3KTdJeH6G%2FvCWhErWG0atbRfgKGDB34apv%2F6VWvpp5nkkC%2BEWagWub%2B0Ghn%2FafRFlNUsIAHMD%2BeW9o8RQXRHJzGW4mMj7%2FkBpUZuAvlF4m7WfjFvtlfJ7UwIeN8MQDIAHjdyhtnLvO8YdIlN7czcJxv6aG6dfDjX5MJzg3Fld0xQN3tGpiU91NVDXxG5d6Cv%2FIgquTzQGATx%2FSwv0t30vHefLWw1JKE%2FNkwC6AuAzomMGS5Ryls88lC%2Bs1UuP%2FahccO6WIcnB7pWZcIHiL%2FQPyIxXgWB9KwqbdIh5pye4qh2c1oorq8L%2F0fCy4MKD7EcyU3BolhviGa1zDSY98%2BGZiaMkFfbOVNwqgBflzR%2BvIaEEUmiLH7StT7ofkT0QcAAyRmdVJwH%2BclqE4diR280byBxRHB%2Bk6hvDW1BuUf7AZ87GlvY4gx39i%2FQ5Xr0cIesW51xSIwwiBGM5V3tUrBKNVbTTEbd55W5vXFt6%2FRoDbb0ouEDMIuSJJedM5WnpVNEcxCIWBS7JGw0HeGQlhxgd7YbcOe7W%2FkOsUQgYjRQovNFku1bgEzC0Fx02NeM1wesZ47GCGQFAJHJXftllQFuqM0cR2szAB0MXecLlbLAoJ2VWkn%2BUZPTzcXDeDOW6WyF6e0H2dXZJQPAi9V%2FZ59mdG5x6AAYLUJsavc5cdjlLmymDlDBI8zVu%2FFj86ieDyTv0xqEIEBgsqF118VHY1qWG6n2UZJKuHrHWpoeoedsWK%2FKJjujVPu2%2BK4BJLudiXLOaTx6otrQm17TPMjnDd8rMru%2BoY%2BwXE0cbohlD9VOKpImefp7lspruvm6Ynu%2BJFskvYCPVUeqbCWJyS2JtSlS451qsK6V8gqP%2BLm0J4AmOmr031hjyA%3D&checksum=1825216643446e5f2d5bbad54a68b79874c7f0ddd165

Otherwise, this might be overkill, but this Zerozone has two independent power supplies that you can custom request be 18V each:

https://www.ebay.com/itm/ZEROZONE-Hifi-LDO-5AX2-Low-Noise-Dual-Output-Linear-Power-Supply-DC12V-DC19V/253930022076?hash=item3b1f68a4bc:g:CzkAAOSwr3xbwB9u

Not sure if there are others that are better.

I caution anyone who is intending to install an external linear power supply to a laptop.  The laptop power supplies are not straight forward.  They don't always send current and I believe they have battery charging circuitry built in.  Also, some laptop power supplies provide both 12V and 19V DC.