Topping PA5 II Plus with more power / more Volt /more Ampere ?

[Hufnagel]

Hello, has anyone tried to operate the Topping with more voltage/ampere?

At very high volumes, the amplifier crashes. I suspect the power of the power supply is too low.

So far I haven't found a 38 volt power supply with 6 or 10 amps.

It is possible to connect 48 volts with 10 amps.

Will the device survive that?

Thanks for the help!

 

[Roland68]

Hello, has anyone tried to operate the Topping with more voltage/ampere?

At very high volumes, the amplifier crashes. I suspect the power of the power supply is too low.

So far I haven't found a 38 volt power supply with 6 or 10 amps.

It is possible to connect 48 volts with 10 amps.

Will the device survive that?

Thanks for the help!

No, the chip is already running at maximum voltage.
The shutdown probably comes from the internal protection circuit in the chip.
You can test a Mean Well HRP N or N3 with 300 watts and 36 volts (can be set to 38 volts). You don't need more than that, the power supply on the PA5 II delivers over 8A, which is significantly more than the amplifier can handle, briefly even 20A, or 28A for 5 seconds.

Alternatively PA7, the new A7 from 3E Audio or a Sabaj A30a, my favorite over the PA5.

 

[DVDdoug]

Note that the amplifier determines how much current (Amps) flows, as long as the power supply is capable (Ohm's Law).

For example, if you live in the U.S. the 120VAC is constantly present at the power outlet but no current flows if nothing is plugged-in or tuned-on. With a 100W light bulb a little less than 1A flows. If you plug-in (and turn-on) a hair drier you might get 12-15A. If you plug-in tow hair driers you get excess current and blow a circuit breaker.,

 

[Roland68]

Note that the amplifier determines how much current (Amps) flows, as long as the power supply is capable (Ohm's Law).

For example, if you live in the U.S. the 120VAC is constantly present at the power outlet but no current flows if nothing is plugged-in or tuned-on. With a 100W light bulb a little less than 1A flows. If you plug-in (and turn-on) a hair drier you might get 12-15A. If you plug-in tow hair driers you get excess current and blow a circuit breaker.,

You're right, but nobody can tell us how much power the topping power supplies of the PA5 II (3.2A) and Plus (4.0A) can actually deliver continuously and for a short time.
If these power supplies are well constructed and have built-in overload protection, it may actually be the case that the PA5 II and Plus are limited in their maximum power.
With the suggested HRP with 300 watts and 8A, this is impossible, but alternatively you can use the HRP-600N3-36 with 16A and briefly over 55A (5 seconds).

 

[Hufnagel]

Thank you for your quick replies.

You can hear a click in the amplifier, so something is being switched off when the load is too high.

With a bit of luck, I ordered a second original power supply today (38 euros).

It was shipped from France today and will arrive in Germany in a few days.

I will operate both devices in parallel.

I will report on how the Topping PA5 II Plus performs with 8 amps.

 

[Roland68]

Thank you for your quick replies.

You can hear a click in the amplifier, so something is being switched off when the load is too high.

With a bit of luck, I ordered a second original power supply today (38 euros).

It was shipped from France today and will arrive in Germany in a few days.

I will operate both devices in parallel.

I will report on how the Topping PA5 II Plus performs with 8 amps.

You know that it is not a good idea to connect two switching power supplies in parallel?
And definitely do not operate them in parallel without a load.

 

[Hufnagel]

I didn't know that.

 

[Grotti]

Which speakers do you use?

 

[JeremyFife]

What kind of 'high volumes' are you trying to achieve? Can you give a bit more detail on your speakers, how far you sit from them and how big a space you are trying to fill?

It may be that you just need a more powerful amp (or more sensitive speakers) ...

 

[Roland68]

I didn't know that.

Then I would definitely advise you not to do that.
In the best case, you won't get double the power/200%, but a maximum of 150% power from one power supply, and that without additional overload.
In the worst case, you'll barely get more power with 2 power supplies than with one and overload. But there's a high risk that something will break.
And without additional components, I wouldn't connect the power supplies together, because if the amplifier switches off or you accidentally switch it off, there could be a problem.
For this reason, Mean Well and other manufacturers have special power supplies in their range that can be connected in parallel.
But with an amplifier like this, that doesn't make sense. And saving money is the worst guide.

 

[V.b.]

It is not likely that it shuts down due to power supply. It should just clip.

Unless it is defective, most likely you have a low impedance load. Try a new amplifier or use high pass filter on the speakers, with or without a subwoofer. You will not believe how much power is wasted by the amplifier in a frequency range the speakers are not able to reproduce.

Or try an amplifier rated for 2 ohm load.

 

[Hufnagel]

As promised, a short response. It is very likely that the TPA 3251 is installed in the topping pa5 II plus. It only works with a maximum of 36 volts and 5A. So my thoughts don't make sense. Thank you very much for your help!

 

[Roland68]

As promised, a short response. It is very likely that the TPA 3251 is installed in the topping pa5 II plus. It only works with a maximum of 36 volts and 5A. So my thoughts don't make sense. Thank you very much for your help!

The maximum voltage at which the TPA3251 can be operated is 38 volts, which is also the voltage of the topping power supplies. The measurements in the TI diagrams were also created with this voltage.

The current consumption of the TPA3251 can be around 8 amps at full power and the protection circuit allows peaks of up to 14 A, but this can also be set lower with the PA5.