My WiiM Amp tests

[jeromeof]

Regarding load dependence, is there an issue when impedance of the loudspeaker is 6 Ohms? The KEF LS50 Meta has a 6 Ohm impedance at higher frequencies.

One huge advantage this device has over say a Fosi Audio V3 as far as load dependence issues is the PEQ built in - effectively variation in higher frequencies can be fixed with a single filter.

 

[onlyoneme]

I've finally finished my LPF, first results are promising in terms of reduced impact of HF switching signal and reduced noise level. Unfortunately distortion based measurements do not seem to improve.

 

[canard]

I've finally finished my LPF, first results are promising in terms of reduced impact of HF switching signal and reduced noise level. Unfortunately distortion based measurements do not seem to improve.

there was no real reason for it to change the big problem observed on your device in imd or multitone at 5w...
but it had to be done...
;-)

your machine clearly has a problem....
"

A word about some concerns I have so far.
My unit is humming, buzzing, or hissing, no idea which word fits the best but the amp produces some noise from itself. It's more quiet with mediocre volume levels but gets louder for high power outputs. And unfortunately also when in idle. I can imagine it won't bother in daily use, but when it sits on the desk it's simply annoying. Fortunately I've been told that the noise is from the power transformer and it won't happen to production units."

 

[onlyoneme]

Measurement part has been updated.

 

[cc_rider]

WiiM has confirmed they're using the TPA3255 chip. Amir has just measured a TPA3255 amp with post-filter feedback (PFFB), which takes this chip to another level, apparently, and helps with that load dependency of the FR. @WiiM Team, any chance of implementing the PFFB?

3e audio TPA3255 Amplifier Review

This is a review and detailed measurements of the 3e audio TPA3255 chip based stereo amplifier. It was sent to me by the company as a complete unit even though they only sell the amplifier modules. As you see, it is a generic box which is something you can easily build yourself. I don't know...

www.audiosciencereview.com

 

[onlyoneme]

For those interested in technical details of PFFB for 3255:

https://www.ti.com/lit/an/slaa788a/slaa788a.pdf

 

[canard]

3E AUDIO 260-2-29A PFFB Stereo amplifier Module

The 3E Audio PFFB module is a high-performance Class D amplifier that can operate in stereo (BTL) or mono (PBTL) mode. It is based on the use of TPA3255 amplifier chips allowing it to develop an important power of 2x225W or 1x250W under 4Ω.

www.audiophonics.fr

 

[onlyoneme]

3E AUDIO 260-2-29A PFFB Stereo amplifier Module

The 3E Audio PFFB module is a high-performance Class D amplifier that can operate in stereo (BTL) or mono (PBTL) mode. It is based on the use of TPA3255 amplifier chips allowing it to develop an important power of 2x225W or 1x250W under 4Ω.

www.audiophonics.fr

I've seen some measurements of this module, results were impressive.

 

[DRC]

For those interested in technical details of PFFB for 3255:

https://www.ti.com/lit/an/slaa788a/slaa788a.pdf

Something to add in the Wiim Amp Pro or Amp Pro Plus.

 

[Brantome]

... with a headphone section/socket

 

[onlyoneme]

... and a pre-amp out

 

[Achim1811]

Next round opened?
And eventually an afterburner for power hungry Polk speakers?

 

[Smartplug]

... and a pre-amp out

Would be awesome if it has those mono block I have can be utilized.

 

[Brantome]

I don't know if it's just human nature but I see this in other arenas too - when a new product comes out, there are more comments about what it doesn't do or could have done better than there are comments complimenting it. Guess we're just an unhappy bunch at our core

 

[Smartplug]

Does AVR on pure direct mode is nearly or no where near on stand alone preamp?

 

[Achim1811]

I don't know if it's just human nature but I see this in other arenas too - when a new product comes out, there are more comments about what it doesn't do or could have done better than there are comments complimenting it. Guess we're just an unhappy bunch at our core

The good part is it keeps things moving.
The bad part is it keeps things getting more expensive.
The lunatic thing is that part two is ignored by one or another.

 

[canard]

in principle if a small headphone module was developed it could be integrated into a streamer alone like a pro pro plus... without hp amplification, mini system etc...

... with a headphone section/socket

 

[Smartplug]

I don't know if it's just human nature but I see this in other arenas too - when a new product comes out, there are more comments about what it doesn't do or could have done better than there are comments complimenting it. Guess we're just an unhappy bunch at our core

True sweet chick lol human has no satisfaction in life there will always be something that they always want or need. Even they give you 6 girlfriends you still not be happy

 

[Yoku-San]

... and a pre-amp out

Don't forget a Phono In.

Actually, I would love that. And an integrated CD Player. All I would need then is the WiiM Amp Ultra Mega Pro, my Lintons and my DUAL turntable.

 

[cc_rider]

I don't know if it's just human nature but I see this in other arenas too - when a new product comes out, there are more comments about what it doesn't do or could have done better than there are comments complimenting it. Guess we're just an unhappy bunch at our core

Except that this (PFFB) is something TI published for the chip that WiiM is using. They could have implemented, but chose not to, for some reason. Perhaps it’s a couple of bucks more parts?

Given the excellent performance of WiiM’s streamers which has driven sales, you’d think they’d want the best performance from their Amp, as well.