DAC同headphone amp input/output impedance的問題

hkpm

網上見到話DAC個output impedance要小過headphone amp input impedance最少10倍
我自己一向都無留意呢樣野
所以想問如果真係跟唔到的話,
say DAC output impedance = 1000 ohm, headphone amp input impedance = 2000 ohm
會有乜野後果? 聲音變差? 定係會整壞DAC/AMP/headphone ?