No one actually knows how to lculate what speaker cable they need

It goes back to cable manufaturars, mostly provide no relevant data! to sales and the users. None will answer this!
Whay do you think that you own now the optimal cable to your setup?
I think I've figured it out. 

I would aspect cables maker to specify:

1. The actual cooper gauge.
2. The cable length (feet or meter).
3. It’s actual resistance (for a single and for a pair (Red+Balck) in Ohms.

I already made cables of 4 AWG (3m) and 0 AWG (2.5m).
Also has the technical solution to make 2x0 AWG and 4x0 AWG cables.
So far, all cables were made for free, only cost of material.

Can this site (forum) hold pictures? I can attach some.

For all who think it is a joke, you better check it out. First thing, you can get your speakers closer to the amplifier (as a start) and use some jump start cables between the amp. and speaker. Be carfull not to do any short circuit on amp’s outputs!
You may be surprised (for the good) from the sonic change! after that you may come back and share that with us. At the end, ask your self what is the right gauge you need and how to get one. You realize that the jump start cables can not to stay for long.

It is better to understand the relations between amplifiers, speaker cables and speakers, do a knowladgble calculation, and by that make a custom cable to fit - rather than gues and try, with no particular direction or insight.
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" Can this site (forum) hold pictures? I can attach some."
That would be great, 100% WAF for sure!
A 4 AWG connected to a B&W802D:
The other end is connected to a 250W PASS LAB power Amp.made for a friend in Israel:
A set of 0 AWG cables before shipping to my friend in Canada:
An other view of 1 set: 0 AWG 2.5m long, to connect between a 250W EMPTICA power Amp.
and a pair of Vienna acoustics Beethoven speakers:
For both cables, the outcome was noticable.
This is the comment of the 0 AWG cables replacing a 12’ 14 AWG set:

"My initial impressions: It’s like having new speakers. The sound is pure and clean. Minute details are suddenly apparent. The range is amazing. Highs, mid-tones and a new bass that I didn’t know my speakers were capable of.

It feels that for all these years my speakers were being choked, and now can suddenly breathe and have their full voice.

To say I’m happy about my new Lang speaker cables is an understatement. I’m thrilled. Thank you for building these superbly engineered cables to unleash the full potential of my home sound system".

For posting pictures to this site / forum:

Use his site to upload:

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