Buy a 音壓錶 and use the (Is it call )pink noise generated form the amplifier and let the 音壓錶 to help you to do the accurate measurement. Anyway,Is the speaker pointing towards you.
changing the amplifier may help but I guess Denon shouldn't be the bad.
You said "中置啲人聲好弱"? is that commonly in all the movies you played?

make sure all speakers are level matched.

u need a spl meter to manually calibrate.

應該點Set呢 ???

Denon 低 model 的通病/ 取向
之前用 2805 還可以
換了2309 一日, 中置失踪
立即換 2809 中置返來了
中置用Elac 2系
解決方法 1. 換高model(不是換中置, 可能不是中置問題)
2. 換AMP, onkyo中罝好些, 高低model亦然
3. 獨立調高中置音量

唔會因為唔夾而人聲弱個喎，校得唔夠好姐，慢慢㴝啦，再唔掂先請高手出馬啦！

So ???? Can you help me THX !!!!!

早兩期HIFI音響話天龍唔夾MK,夾厚暖聲底喇叭

請各位師兄提點
器材 Denon AVR 1709
Speakers MK 750 LCR
Woofer MK MX-250
Player Pioneer BD