You're assuming the 30" Apple display has 1920 x 1080 resolution. It actually has a native resolution of 2560 x 1600 so 4 of those together would be 5120 x 3200 (not 3840 x 2160).
Let the hive mind of Engadget get that for you.
"I've found myself using my PC for a lot of conversations lately, and I'm also considering recording a podcast to share with anyone who will listen. There are tons of USB headset / microphones out there, and I'm hoping someone has some solid recommendations based on experience. I'll consider both headsets and standalone mics, by the way, but I'd like to keep the bill under $100 if possible. Help!"
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