HBAC-20 : I am disappointed

I am a beginner and this is my first acoustic guitar amplifier.

While I waited for delivery, I took from a friend Harley Benton AC PRO 120.

Even at home, in a small volume HBAC-20 it sounds much worse.

I was expecting that if I setting all frequencies to 0 value I get a clean guitar sound.

Unfortunately this is not true.

I suppose that because of the woofer amplifier frequency curve is not linear.

I observe some abnormal gain of medium frequencies.

Also the effects have been some kind of synthetic.

Reverb I think is similar to the hall effect than normal reverberation.

But the chorus seems that only distorts the sound and not add real effect, and is not usable.

I'm really disappointed.

I can not say anything bad about the appearance or quality of manufacture.

But I suggest that before you purchase this amplifier try it in live. Maybe only I think that the sound is bad, and others like it.