Analog cables, digital cables, and optical digital cables all have forward and reverse directions. The sound quality also differs depending on which way the power outlet is plugged into the upper or lower hole.

       

Analog cables, such as speaker cables and RCA cables, as well as

SPDIF optical digital cables, coaxial digital cables, HDMI cables, etc.

All cables can be connected in either the forward or reverse direction.

After connecting the cables and turning on the power supply, it is recommended to connect them in the direction that provides the best picture and sound quality, or the direction that provides the least resistance when checking the power flow. It may be better to replace the power cable with one sold by another manufacturer for better sound and picture quality. Moreover, you may be able to see the difference in sound and picture quality by plugging the cable directly into a wall outlet rather than an extension tap, and then swapping the cable between the top and bottom holes. You may also try grounding or virtual grounding for better sound and picture quality. As a trial version of virtual grounding, why not try two empty steel cans of mandarin oranges and an alligator clip cord made by Akizuki Denshi, which clips between the empty cans and the ground terminal? After you have enough money, you can connect a virtual grounding wire (less than 30,000 yen per wire) or a grounding wire for each terminal of a wall outlet to the ground to improve sound and picture quality. Everyone's perception is different. Please connect one ground or virtual ground per hardware power cord. If you connect one ground or virtual ground to more than one power cord, it may cause a grounding loop, which may result in noise.

In general, banana plugs for speaker connectors are easy to use for beginners, but they are easy to disconnect, and from a sound quality standpoint, Y-lugs that are not nickel or gold plated but rhodium plated are the best in terms of durability, rust resistance, and sound quality. In addition, there are products such as OYAIDE's Y lugs processed by SPSL (machined copper alloy + silver/platinum plating) and 

http://www.oyaide.com/ja/products/power_supply/power_cable/tunami_gpx-r_v2

Oyaide's TSUNAMI power cables processed by buffing phosphor bronze and plating with gold/palladium plating. It is possible to ask an electronics store or an audio/audio accessory store to custom-order Y-lugs for speaker cables. Power cables and outlet plugs can also be special-ordered. Copper Y-lugs sound better, but unplated copper Y-lugs deteriorate quickly due to rust. Unplated copper connectors for power cables are commonly used for their good sound quality, but they also deteriorate quickly due to rust. Rhodium-plated or silver-plated connector plugs for power cables are also available on Amazon for special order. As for age-related deterioration, if sound quality begins to suffer after 15 to 20 years, it may be time to replace the product. The same is true for CDs made of resin, which deteriorate and cause sound quality problems.

       

Power cables for sale ONKODO

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When connecting the power plug to the power cable.

In general, it is better not to solder the power cable to the power plug.

It seems that in general, it is better not to solder when connecting a power plug and a power cable.

https://fixerhpa.blog.fc2.com/blog-entry-353.html

ONKODO BP-208BR Rhodium-plated banana plug

(made of beryllium copper)  

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ONKODO CT-204RH Rhodium plated Y-Lug 4 pcs.

(made of pure copper)  

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ZONOTONE 6NSP-Granster 5500α/m

ZONOTONE 6NSP-Granster 5500α/m cut sale

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Optical Digital Cable 2.0m Hi-Res Audio Compatible

192KHz 24Bit High Grade Square to Square Black

VM-4070BK