Thank. I read somewhere , 300W will be the minimum to worth it... Fosi have 240W... I have separated power supplies for each mono... 48V 5A each... it will be enough?
My issue with those PS Fosi sells on their website is that they off the 48 V 5 A, or 10 A versions. That's fine for 8 ohm nominal speakers but for 4 ohm nominal, for 240 W, you would be better off with a 36 V, or even 32 V, 10 A power supply.
As I mentioned many time on ASR, the common way of looking at "Watt, Power" is not as good as looking at voltage and current rating instead.
Power depends on both voltage and current, so you can have the same 240 "Watts", but that 240 W it could be achieved with higher voltage, lower current,, or higher current, lower voltage. In this case, if you can only choose the 48 V version, yet your 4 ohm speakers is much better off with the 36, or even 32 V, but higher current rating such as 10 A.
Power supplies are rated for VA (commonly W as well but not as good), VA = V X I (voltage X current), so 32 V X10A = 320 VA (commonly stated as 320 W, but again, not as right).
The 48 V 10A can be rated 480 VA, or "W", but it doesn't help you because you use 4 ohm speaker (think Ohm's law as well, not just the power formula), that will do better with power supplies that has higher rated current, not higher voltage in this case. You can buy the 48 V 10 A that Fosi does offer, it would be overkill, but it will do the job, and you get both higher voltage and current, always better to have something you don't need than something you do need but don't have enough.
. Both are dated 2022 
