I see, well I reckon you've got good control of your pressure then James 👍Hi Gary, I use them on multicore cables from flex to 16 core, every size from 0.5. to 1.5mm. Thats why I use them strips outer sheath and inner sheaths with the same pair only have to switch for crimping.
They looked to me like some wire shears that I've got. With very little pressure on their long handles, they cut clean through 2.5mm twin and earth as if it wasn't there.....with less effort they'd take your finger off.
That speaker cable has virtually no outer insulation - my shears would be my last choice for removing it......I wouldn't have the control to prevent me chopping through 😜