Multi-channel Amp,Which one you would like to own?

[blickpunkt]

Chose PAM252 instead of 3E Audio A7 because of the internal power supply. Will hopefully arrive on the weekend.

 

[daniboun]

(my bold)

not if the cooling in it's current form keeps the devices cool enough. That can only be determined by detailed thermal tests which I am assuming has been done by the manufacturer.

Assuming this was done by the manufacturer: does it need to be mentioned in the user manual?

 

[antcollinet]

Assuming this was done by the manufacturer: does it need to be mentioned in the user manual?

No. When have you ever seen a manual provide all the details of the R&D testing carried out during product development?

This is normally viewed as proprietary information (it certainly was by my company).

All that is needed in the manual is the operating temperature specifications, and any relevant standards the product is compliant with.

 

[daniboun]

All that is needed in the manual is the operating temperature specifications, and any relevant standards the product is compliant with.

Unless I'm mistaken, this isn't the case according to the PamX amplifier user guide.

 

[Roland68]

No. When have you ever seen a manual provide all the details of the R&D testing carried out during product development?

This is normally viewed as proprietary information (it certainly was by my company).

All that is needed in the manual is the operating temperature specifications, and any relevant standards the product is compliant with.

Unless I'm mistaken, this isn't the case according to the PamX amplifier user guide.

In the EU, temperature specifications for amplifiers are not required unless they fall under mandatory safety instructions.
The maximum housing temperature (contact temperature) in the EU is 50-55° Celsius. Since it is highly unlikely that the housings of these amplifiers will reach or exceed this temperature, no specifications or markings are required.

This does not apply, of course, if such devices are exposed to direct sunlight, and operating them in such conditions would be negligent.

 

[harkpabst]

Each channel is configured as PBTL (parallel bridge-tied load) mode, means two half-bridges are placed in parallel to supply twice the current and reduce the RDS(on), or on
resistance of the output MOSFETs. This provides greater output power and efficiency (from the data sheet)

Thanks I know that I read the spec.

 

[antcollinet]

This does not apply, of course, if such devices are exposed to direct sunlight, and operating them in such conditions would be negligent.

While perhaps not required by regs, I would expect it would be in the interest of any manufacturer to state limitations for operation - eg max temperature, not in direct sunlight etc - just to avoid this sort of issue.

Your average consumer is not going to be aware of the sunlight topic.

 

[Rafael2000]

@3eaudio I can see the pam amplifiers on amazon.de. But the pam258 does not seem to be available. Will it be available in the future? Buying it from Aliexpress does come with some uncertainties regarding tax and import fees.

 

[blickpunkt]

Are these the same modules (or same construction) as in the A7 Monos? I bought the PAM 252 and it feels like a double Mono construction with an integrated GAN Power supply. I can't find if the supply is 5A or 10A version

 

[harkpabst]

Are these the same modules (or same construction) as in the A7 Monos? I bought the PAM 252 and it feels like a double Mono construction with an integrated GAN Power supply. I can't find if the supply is 5A or 10A version

The A7 Mono is not based on a single channel module. It's based on the full stereo PCB of the A7 with one channel not populated.

The PAM15x and PAM25x are a new development.

 

[Roland68]

Are these the same modules (or same construction) as in the A7 Monos? I bought the PAM 252 and it feels like a double Mono construction with an integrated GAN Power supply. I can't find if the supply is 5A or 10A version

Essentially, these are the same modules with the same measured values.
The A7 is actually a dual-mono device in terms of its design. Therefore, the A7 Mono uses the same circuit board, but only half of it is populated—a complete TPA3255 in a PBTL configuration.

The PAM252 is practically identical; its design and measured values appear to be the same. However, each channel/TPA3255 chip has its own dedicated board.
The power supply is large enough for the full output, as it is designed for four mono modules.

 

[Hindsider85]

Why is there no 7 channel or a 3 channel one (Okay, that one is coming...)?
So 3E Audio made the chassis of the 6 channel version larger, only for customers to purchase the critical 7th channel modul, for a premium, after!? Or buy the 8 channel one and leave the 8th one pretty much unused and without any real purpose? I love the product but I HATE the underlying obvious scheme...

 

[Roland68]

Why is there no 7 channel or a 3 channel one (Okay, that one is coming...)?
So 3E Audio made the chassis of the 6 channel version larger, only for customers to purchase the critical 7th channel modul, for a premium, after!? Or buy the 8 channel one and leave the 8th one pretty much unused and without any real purpose? I love the product but I HATE the underlying obvious scheme...

There's no business model involved.
There are only two enclosures: one for four modules with one power supply and one for eight modules with two power supplies.
Accordingly, the smallest configuration for the four-module enclosure is two modules, and for the eight-module enclosure, it's five modules.
Currently, only the most popular configurations are available; all configurations will be available in the future.

You mustn't forget that all the finished devices first have to be manufactured, and of course, the whole thing needs to be financed somehow, since we're not just talking about five or ten units.
Additional modules for future expansion will be available for purchase

 

[Hindsider85]

There's no business model involved.
There are only two enclosures: one for four modules with one power supply and one for eight modules with two power supplies.
Accordingly, the smallest configuration for the four-module enclosure is two modules, and for the eight-module enclosure, it's five modules.
Currently, only the most popular configurations are available; all configurations will be available in the future.

You mustn't forget that all the finished devices first have to be manufactured, and of course, the whole thing needs to be financed somehow, since we're not just talking about five or ten units.
Additional modules for future expansion will be available for purchase

Yeah, maybe I was a bit too inquisitive here. I mean why not give us the 7 channel version outright? Yes, its a business and I think this way they want to ease the customers to the upgrade module style. Its still annoying. I just ordered the 6 channel one and my Dolby Atmos set-up has 7 floor speakers. Now I have to use one of those with my Denon X4800H. Which is annoying, because it can barely deliver a quarter of the power of a single Class D module here...Im just venting.

 

[Roland68]

Yeah, maybe I was a bit too inquisitive here. I mean why not give us the 7 channel version outright? Yes, its a business and I think this way they want to ease the customers to the upgrade module style. Its still annoying. I just ordered the 6 channel one and my Dolby Atmos set-up has 7 floor speakers. Now I have to use one of those with my Denon X4800H. Which is annoying, because it can barely deliver a quarter of the power of a single Class D module here...Im just venting.

It seems you don't want to understand, but 3E Audio isn't a huge corporation, and their devices have only been on the market for a few weeks.
They started out with DIY amplifier boards, had smaller projects with finished amplifiers, and then released the A5 and A7 series.
The PAM series is many times larger in terms of funding, assembly effort, logistics, facilities, and space requirements, etc. All of that needs time to grow, and ideally, without compromising quality, as is the case with other manufacturers.
On top of that, these devices are incredibly affordable, not to mention their performance and specifications. I don't know of any other manufacturer that can compete.

Have you even contacted 3E Audio to ask if they can supply you with a PAM257 yet?
Or if they could quickly supply you with a replacement module for a PAM256?

 

[Hindsider85]

Just gonna say, @3eaudio, I would never buy something with that horrible looking white text printed on the front.

It just screams "cheap"

True. Why not write it in cursive instead? Or a metal plate on the far side of the corner, with an emblem or something? Look, I have nothing to do with design and even I could have done a much better much. Hell, a 6th grader could have done a better job. Unbelievable...

 

[Hindsider85]

It seems you don't want to understand, but 3E Audio isn't a huge corporation, and their devices have only been on the market for a few weeks.
They started out with DIY amplifier boards, had smaller projects with finished amplifiers, and then released the A5 and A7 series.
The PAM series is many times larger in terms of funding, assembly effort, logistics, facilities, and space requirements, etc. All of that needs time to grow, and ideally, without compromising quality, as is the case with other manufacturers.
On top of that, these devices are incredibly affordable, not to mention their performance and specifications. I don't know of any other manufacturer that can compete.

Have you even contacted 3E Audio to ask if they can supply you with a PAM257 yet?
Or if they could quickly supply you with a replacement module for a PAM256?

Well im not well versed with this company, besides their A5/7 amps. Which are pretty much the best ones based on the Texas Instruments chips.
I wish I could get another module to finish my 7 speaker floor set-up, but I have seen the 6 and 8 channel chassis and I dont even know how one could place another module there. There are no openings or holes for another module. How can one do this without heavily modifying the backplate?
It doesnt make sense.

 

[Rinz]

Well im not well versed with this company, besides their A5/7 amps. Which are pretty much the best ones based on the Texas Instruments chips.
I wish I could get another module to finish my 7 speaker floor set-up, but I have seen the 6 and 8 channel chassis and I dont even know how one could place another module there. There are no openings or holes for another module. How can one do this without heavily modifying the backplate?
It doesnt make sense.

If you look closely at the images of the backplate, it appears they've placed some sort of cover or sticker that would be easily removed to provide access to additional modules.

 

[john61ct]

I mean why not give us the 7 channel version outright?

Mulit-channel Amp,Which one you would like to own?

Thanks for model#s Best source would be directly from China probably Tariffs continue to be a risk

www.audiosciencereview.com

Mulit-channel Amp,Which one you would like to own?

Now, if we read between the lines, we understand that AlsoZone is more of an integrator that has used the services of 3e Audio."powered by 3E Audio" I know that 3E audio offers OEM service "ODM/OEM Service Our ODM/OEM business is specialized in innovatively design and manufacture of audio...

www.audiosciencereview.com

Mulit-channel Amp,Which one you would like to own?

You now understand the actual intended meaning, give it a rest! Maybe get outside and touch some grass. If you can't cut him some slack, maybe just exercise your right to personally boycott all these brilliant makers with less than perfect English language skills.

www.audiosciencereview.com

 

[Hindsider85]

When can we expect a review from Amir?