Should I run my SMSL AMP-03 (TA2020 based) T-amp at 14V?

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I have been using my SMSL AMP-03 for years in my desktop setup with a 12V 5A adapter.

Yesterday evening, I tried it in my living room set up with my home made full range speakers and it blows my full size amp away at sensible volume levels so I consider swapping amps in the house and use the T-amp with a multiple input DAC.

Even though I am pleased with the sound and the volumes I can reach cleanly, I am wondering wether upgrading the power supply to 14V will add some headroom.

The unit itself has 9-13Vdc printed on it but I have seen 14V adapters suggested for TA2020 based amps.

Could I use an adapter like the SMSL 1438T or do I risk frying something?
 
I am using the amp with relatively inefficient 8 ohm speakers. I have not encountered any issues at comfortable volume levels. If it is risky for either the amp or the speakers then I will leave it at 12v. If 14v does not do any harm and adds a little headroom then I would like to do it.

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