I've noticed from Topping's pictures of the internals of their headphone amplifiers, they really really like the TPA6120A2 for the output stage - a current-feedback amplifier design (it works with their nested feedback with top notch op amps like OPA1612, sometimes 1656, and other stuff that we can't see because it's top sekret! (in those shielded metal cases...). Usually the 6120A2 would have an output impedance of about 40 ohms, with 10 still being stable but barely. 5 ohms with low impedance headphones would be looking for problems. But Topping's somehow got it to 0.1 ohm (with protection, ofc)
So the Topping L30 II is a single ended stereo headphone amp with a 1/4" output (and RCA if you want to use it as a preamp). Inside, there are two 6120A2s... These are stereo chips!... So why are there two? Is it for more thermal headroom? Are they running the channels parallel?
In the A70 Pro (fully balanced input/output, though the signal is single ended through the volume control), there are FOUR of these chips! Are they in parallel? One side off to maximize thermals?
So the Topping L30 II is a single ended stereo headphone amp with a 1/4" output (and RCA if you want to use it as a preamp). Inside, there are two 6120A2s... These are stereo chips!... So why are there two? Is it for more thermal headroom? Are they running the channels parallel?
In the A70 Pro (fully balanced input/output, though the signal is single ended through the volume control), there are FOUR of these chips! Are they in parallel? One side off to maximize thermals?
