Any trough hole friendly headphone protection circuit?

On single supply Amp with a capacitor on the out, I use this.
speaker-protector-circuit.png
 
I don't trust any piece of electronic equipment even it its 99% safe. For me a protection circuit is mandatory even in low power devices. If something happens i wanna keep my iem's and cans safe from any type of damage.
I agree. My headphones are worth a lot more than the amplifiers that drive them. An event that puts DC or a very high level AC signal on the output of the amp will destroy them.
 
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