The duplicated amplifier as ground design is pointless and pretty much strictly worse than using a normal ground, but has somehow become semi-popular among cert

The duplicated amplifier as ground design is pointless and pretty much strictly worse than using a normal ground, but has somehow become semi-popular among certain misguided parts of the audiophile community. Good article about it here[1]. The problem with just using the middle of the batteries as ground is that it creates a potentially headphone-damaging DC offset if the batteries drain unevenly for whatever reason. The resistor bridge is the simplest way to avoid this problem, though there are lots of ways to create a dual rail power supply with various tradeoffs[2]. [1] http://nwavguy.blogspot.com/2011/05/virtual-grounds-3-channel-amps.html http://nwavguy.blogspot.com/2011/05/virtual-grounds-3-channe... [2] https://tangentsoft.net/elec/vgrounds.html https://tangentsoft.net/elec/vgrounds.html