The FTC originally proposed a 0.1% THD specification in 2020, but after a 4-year amendment period receiving comments from manufacturers, consumers, and retailers, they revised this upward to 1% THD because many products, especially inexpensive and tube amplifiers, could not meet 0.1%
factualpending
Evidence Quote
“in 2020 they originally proposed...they waited four years and took in a whole lot of comments...originally they proposed 0.1% THD...there's a lot of products that can't get especially especially tube amplifiers”
Created: 8/13/2026, 4:50:14 AM
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