New P482 Stereo Power Amplifier

[Alan March]

I would have thought a bridged design would be cleaner than an equivalent non-bridge design. Isn't the former a balanced design by nature, greatly suppressing even-ordered harmonics?

The differences are very small between the two measurements and don't forget we are still at the mercy of the signal source. The final result is a complex summation of the signal source, the device under test and the measurement system.

There is a lot more to it than expecting a "textbook" improvement. We are right at the limits of all the contributing components.

Distortion down at -140dB is really difficult to measure accurately. You will also see run to run variations with each subsequent measurement being slightly different.

 

[Oniiz86]

Well, it's not really novel. Composite amplifiers have been around for many decades. They still have limitations, but sure better than using the reference Hypex/Purifi circuit and hoping for the best like some manufacturers are doing

I should've clarified, I meant amongst Purifi OEM assemblers like yourself, the majority are using the OPA1656 and/or OPA1612 but Boxem has gone for a composite OPA1612/OPA1656 op amp design with DC filtering for his premium "Arthur" amp models but for the cheaper "A Series" models has settled on the OPA1612 like you've done without the superior buffer design & expertise.

 

[Alan March]

Yes interesting that they have had to put DC blocking capacitors in between the buffer and the module.

The high input impedance wouldn't have helped with the op amp input current creating a DC offset.

 

[SmartOne_2000]

Yes interesting that they have had to put DC blocking capacitors in between the buffer and the module.

The high input impedance wouldn't have helped with the op amp input current creating a DC offset.

Maybe they used a DC servo to cancel the offset ...

 

[Alan March]

Maybe they used a DC servo to cancel the offset ...

They didn't in the last version I looked at.

Edit: Just checked. The green caps.

 

[SmartOne_2000]

There is no "hassle" shipping to the US. No different to anywhere else. The only issue is the tarrifs. It would be a very bad business decision if BoXem pays the tariffs.

The EU is headquartered in Brussels, Belgium. So EU tariff rate of 15%.

Equally, buying from the US is not a "hassle". Customers would just have to pay VAT. The shipping companies contact the customer for payment.

Further explanation .... B2C = Business to Consumer.

 

[Alan March]

Further explanation .... B2C = Business to Consumer.

That's utter nonsense.

Apart from the fact that US consumers get charged the tariff tax by the shipping company before the product is delivered, nothing has changed.

There is nothing difficult about it. We as a company don't get involved at all with the tariff. We just send the product as normal and (DHL in our case) contact the customer for payment of the tariff as they are the customs/import brokers to the US government.

We do get some emails from sone customers asking why they have got a tarrif bill, but I just explain they have been lied to by Trump. The tariff is a tax on them, not us. Once they understand, their annoyance is directed at Trump, not us.

I would say that's it's simply the fact that BoXem have no US sales.

 

[SmartOne_2000]

That's utter nonsense.

Apart from the fact that US consumers get charged the tariff tax by the shipping company before the product is delivered, nothing has changed.

There is nothing difficult about it. We as a company don't get involved at all with the tariff. We just send the product as normal and (DHL in our case) contact the customer for payment of the tariff as they are the customs/import brokers to the US government.

We do get some emails from sone customers asking why they have got a tarrif bill, but I just explain they have been lied to by Trump. The tariff is a tax on them, not us. Once they understand, their annoyance is directed at Trump, not us.

I would say that's it's simply the fact that BoXem have no US sales.

What I don't get is that they tied it to 'Customer Satisfaction'. Are they saying US customers are a headache to deal with and that the back-and-forth, in an effort to please them, is not worth it?

What has your overall experience with US customers been like from the early days of your company?

 

[Alan March]

What I don't get is that they tied it to 'Customer Satisfaction'. Are they saying US customers are a headache to deal with and that the back-and-forth, in an effort to please them, is not worth it?

What has your overall experience with US customers been like from the early days of your company?

I don't understand that either.......unless they have a lot of problems with their product which makes it an expensive hassle to deal with.

US customers are no different to ones in any other country.