Re: looking for a soundcard to improve the builtin realtek
Reply #30 –
I ended up getting an ANENG 8008 on eBay for around $20. It's a true RMS, auto-ranging 9999 count model. The specs say it does AC measurements between 40Hz-1kHz.
I used a 60Hz sine wave generated in Audacity, and a 100 ohm dummy load, and the "(Rload * (Vnoload - Vload)) / Vload" formula to measure the output impedance of all of the headphone jacks I had easy access to:
Apple MacBookPro10,1 (laptop) 1.1 ohm
Xiaomi Redmi Note 3 Pro (phone) 1.8 ohm
Apple iPad 2 (tablet) 3.0 ohm
Xiaomi Mi Pad 2 (tablet) 1.4 ohm
Yamaha R-S300 (stereo receiver) 476 ohm
Denon AVR-1603 (AVR) 483 ohm
Nothing new here, just thought I would share. The Yamaha is a stereo-only receiver and was purchased circa 2012, and the Denon is 5.1 channel from circa 2003.