Mine died too. I posted it on Head-fi:
I will post here for you to read so you won't have to click link:
I purchased my Topping E30 / Topping L30 stack November 10, from Amazon from seller SHENZHENAUDIO. The Topping L30 amplifier amplifier was only $118.99 on sale. However, I had to return my Topping L30 amplifier to Amazon today. It malfunctioned and destroyed the drivers in my Sony headphones. The headphone drivers were making crackling and popping noises on my ears. I unplugged them but too late and now they are fried. This is a darned shame because the Topping L30 made most every headphone sound very good compared to many other $100 amps. The Topping L30 made my Sony MDR-CD780 sound better than any headphone I have ever heard in my life. No other amp has ever done this. I am tempted to get another or possibly try get the Topping A90. This is not the first time I have been burned by buying poorly made Chinese electronics. I once purchased a $500 DAC that only lasted three months. Luckily the Topping E30 DAC still functions and sounds great.
This might be what happened to mine. I reached for the volume control when it all happened. Perhaps static jumped from my fingers to the amplifier causing amplifire?