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The A90D is the one I felt it was more affected with this issue out of the two Topping headphone amps I tried out. I also have the LA90, which shows a similar behavior, though this is a power amplifier. Personally, I find interesting I have not experienced this with the THX 789 (even before...

I know I sound like a snake oil seller but I just wanted to give a description of the differences. There is no audible difference in noise, distortion or hum/hiss at all. IMO, it is not big deal but it is definitely undesirable. I wish I had two chains with the same components to carry the...

Newbie here seeking feedback on the sound coming from a cold vs warm headphone amplifier. I noticed the sound from both Topping A90D and Topping L70 tends to become more "open", deeper and crisper after being powered-on for around 30 minutes to an hour, depending on room temperature. At first...