Taramps HD3000 IRS2092 version - low power

Hi everyone, I'm repairing a taramps hd3000 compact, the version with irs2092 as driver.
I will have repaired about twenty of them during my career and if memory serves me correctly, I always had the feeling that these sounded really soft, while the old version (the one with IR2010S as driver) sounded very loud already with a low input signal, so much so that you have to be careful with the gain potentiometer.
I've checked everything, absolutely everything, but there's nothing wrong.
The amplifier works perfectly, it draws the right current, it has no background noise, the voltages are right, it just doesn't sound much.
Has anyone noticed anything similar on this model?