Video PART 1. Bi-wiring (not to be confused with bi-𝙖𝙢𝙥𝙞𝙣𝙜) is a method of connecting a loudspeaker with separate high and low frequency input terminals to a single amp channel, using TWO runs of twin lead [two conductor (+/-) wire], said to improve performance over the use of a normal, single run. The claimed benefits vary based on whom you ask, but Sound and Vision magazine, the largest and oldest audio magazine in the US, described the benefits (some maintain exist), as:
"While some experts maintain that bi-wiring can have a beneficial effect by allowing the high- and low-frequency portions of the audio signal to be separately routed to the high- and low-frequency drivers in the speaker. . ." https://www.soundandvision.com/conten...

This video is an in-depth analysis of the ACTUAL difference. Watch it to learn the secret truth most people don't know! After watching this you'll have a better understanding of bi-wiring than, I'd guess, nearly 99% of so-called audio industry "experts"!
00:00 Intro and Terminology
06:18 The Music Signal Pathways
12:29 VOLTAGE Differences
14:46 Testing The Claims

𝐍𝐎𝐓𝐄: 𝐁𝐢-𝙖𝙢𝙥𝙞𝙣𝙜 𝐢𝐬 𝐜𝐨𝐦𝐩𝐥𝐞𝐭𝐞𝐥𝐲 𝐝𝐢𝐟𝐟𝐞𝐫𝐞𝐧𝐭 𝐟𝐫𝐨𝐦 𝐛𝐢-𝐰𝐢𝐫𝐢𝐧𝐠 𝐚𝐧𝐝 𝙉𝙊𝙏 𝐭𝐡𝐞 𝐭𝐨𝐩𝐢𝐜 𝐨𝐟 𝐭𝐡𝐢𝐬 𝐯𝐢𝐝𝐞𝐨. It gets mentioned in passing (but only briefly) in order to explain the distinctions between bi-amping and bi-wiring, since so many people confuse the two. 3:27

Roger Russell, a retired engineer, inventor, and once Director of Acoustic Research at McIntosh Laboratory, Inc. is one of the few sources online who doesn't spread marketing lies in his discussion of speaker wires. He also provides a useful wire table to determine what wire gauge to use for a particular situation, here: http://roger-russell.com/wire/wire.ht...

The Audio Critic magazine (1977 to c. 2015) published a great exposé (including on the topic of bi-wiring) titled "The Ten Biggest Lies in Audio", you can read here: https://www.biline.ca/audio_critic/ma...
[Note: Their original website no longer exists but there's one which has swiped their domain name which seems completely different and more like an ad-centric Amazon affiliated site, it seems to me, so I'm providing this alternate "biline.ca" one instead.]
Because of the article's great importance, Ecoustics decided to reprint it online at their site as well, here: https://www.ecoustics.com/articles/te...

Sound effects were made by either my mouth or common kitchen appliances, I recorded and processed in Audacity.
This video have been simplified or dumbed down to appeal to a broad audience without technical backgrounds, including ones with little to no education in electrical theory nor psycho-acoustics. This is why the first third of the video is devoted to bringing people up to speed with the electrical symbols and industry lingo/terminology, so they can follow along with the rest of the presentation. As I point out with on-screen text at one point 12:40, some statements I may make in the video, like the signals are "exactly the same", I don't mean LITERALLY, but rather: "By 'exactly the same' I mean the music signal (voltage) is effectively FULL range, i.e., the HF and LF voltage content happily intermingle here . . . " There are a few other minor points I verbalized poorly, sorry.

One of the most important principles in audio is that just because two things can be found to be subtly different electrically does not prove they differ audibly. For that we use blind listening tests. From my AVS forum post:

""Bi-Wiring can provide noticeable improvements in the overall transparency". - Polk

A cursory google search on just this statement alone, in quotes, seems to bring up numerous examples endorsing bi-wiring from at least the following companies and/or their retailers, on just the first page of the results:

Polk: "Bi-Wiring can provide noticeable improvements in the overall transparency . . . "
Definitive Technology: "The result is an improvement in the midrange that many enthusiasts believe is significant "
Crutchfield: "A bi-wire cable. . . can improve treble and bass performance. "
Fluance: "How do I use the bi-wiring connections to increase the performance of my system?"
Denon: "Bi-wiring’s advantages are generally considered to be more subtle than bi-amping and center around better control of back EMF (electromotive force) from the speaker drivers and increased definition."
AudioMaxx/Monitor Audio: "Bi-wiring can provide noticeable improvements in the overall transparency"
SVS: "Bi-wiring can provide noticeable improvements in the overall transparency"
B&W, Bower and Wilkins: "Bi-wiring can provide noticeable improvements in the overall transparency"
ELAC: "Bi-wiring can provide noticeable improvements in the overall transparency "

Past this first page of google results there are even more."

Part 2 focuses more on the CURRENT split:    • Bi-Wiring, Pt 2: A Clever Trick You S...