10. Can the 3.5mm and 4.4mm ports of the FiiO KA3 output at the same time?

Yes, but when connecting headphones to the 3.5mm and 4.4mm ports at the same time, the working current will be higher and the life of the KA3 may be affected. Therefore, it is not recommended to connect the headphones to the 3.5mm and 4.4mm ports at the same time.