Q: Will a 20 foot extension cable lower the sound quality from my amp to my headphones?
A: If you run really long cable, you have to watch out for two things: [1] the cable may pick up noise, particularly a hum, and [2] the signal may degrade if you run lengthy stretches of cable, usually because the voltage drops over long distances. And by long distances, I mean long distances, not 20 feet.
You can fix #1 by using with better shielding, and #2 by using XLR out instead of RCA.
But in your case, you aren't running cable through the entire neighborhood, just 20 feet, which is well within the tolerances for RCA unless there is a significant EMI transmitter between the your amp and your headphones.
In sum, you will be fine.
PS: Veni's Trivia of the Day: the term "RCA" in RCA cables comes from the Radio Corporation of America, who first used the format to connect their Victrola record players to their radios in the late 40s or early 50s. Prior to that they were using RCA cables to connect their record player pickups to the chassis, but not as interconnects.
A: If you run really long cable, you have to watch out for two things: [1] the cable may pick up noise, particularly a hum, and [2] the signal may degrade if you run lengthy stretches of cable, usually because the voltage drops over long distances. And by long distances, I mean long distances, not 20 feet.
You can fix #1 by using with better shielding, and #2 by using XLR out instead of RCA.
But in your case, you aren't running cable through the entire neighborhood, just 20 feet, which is well within the tolerances for RCA unless there is a significant EMI transmitter between the your amp and your headphones.
In sum, you will be fine.
PS: Veni's Trivia of the Day: the term "RCA" in RCA cables comes from the Radio Corporation of America, who first used the format to connect their Victrola record players to their radios in the late 40s or early 50s. Prior to that they were using RCA cables to connect their record player pickups to the chassis, but not as interconnects.
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