I found some examples of 8 gauge $peaker cable going into a 4mm banana style plug. The company that sells the cables said they had to add support to the connector to reinforce it due to the weight of the cable.
If you click on the bottom image (6th image down) in the amazon listing they mention why they had to modify the connector.
https://www.amazon.com/Audioblast-Ultra-Flexible-Audiophile-Speaker-HQ-SPK-AP2HD-8AWG/dp/B07WQCV3M9From the Listing:
The brand of connector we used for this professional cable assembly: Eminence 24k, 3 micron Dual Gold Plated 4mm (standard diameter) Audiophile-Grade Banana Connectors custom made for superior abrasion & corrosion resistance. Each connector weighs 10g with a fully insulated body to prevent accidental shorting.
Interesting terminology used in the top review...
(Not even burned in, treble was more airy, mid-range jump forward, depth of stage, etc...)
Previously I was using Audio Blaster 12ga cable and enjoyed remarkable sonic improvements in the mid-range, tighter bass and an open & airy treble. I rated the 12ga 5-stars for performance to price, a true improvement at a sensible price.
1yr later, I needed to increase length of cable to accommodate the new entertainment cabinet. Increased length of cable increases resistance, so I ordered a larger diameter cable (8 ga AWG).
I was blow away by the improvement in sound quality, the mid-range jump forward, treble was even more airy & open giving improved imagining/depth of stage with the bass even tighter, less restrained and they aren’t “burned-in” yet.
If you’re looking to upgrade your audio system speaker cable, looking to improve your sound, buy the 8-gauge cable. You will not he disappointed