TPA3255 Reference Design Class D Amp with PFFB

[xrk971]

As long as they are the “best” to you is all that matters. But I have heard many systems and I can tell yours is up there. The frequency response in your thread is right on target with the slight tilt of the Harman House curve. I know what the GRS planar can do and I know Tang Band paper cone full ranges works well as a mid. I know you have got a great amp! 😂

You have a system to be proud of and can enjoy now. So spend some time relaxing and listening to music for a long time. Until the itch to build the XSD creeps in.

Speaking of Pearl 3, I am listening to Jhofland’s version and it sounds fantastic. I have a much more basic TT though but nice cartridge.

Cheers,
X

 

[Plott]

Many thanks for the kind words, X!
It's great to read this from someone who is light years ahead of me in speaker design!
Yes, now I enjoy the music, I listen to it since many hours now and it's just beautiful.
However... I have so much itch when it comes to building... HyperSET, Pearl 3, some linear PSUs...
And of course I have to finish the xo of The Open Baffle (currently it's a lump of components with point-to-point soldering) and the birch ply baffles will also arrive soon (instead of the MDF ones)... so, very much to do
But that's fun

Many thanks again!
Cheers

 

[Plott]

She likes it too

 

[Plott]

Just one last demo now with a completely different music:

 

[Plott]

After discovering how great this power amp can handle my speakers, it is now my main power amp, period.
I listen almost every day and it's simply gorgeous.
Just wanted to say
I'm curious, X, when you will offer another great power amp like this

 

[xrk971]

I have the A40 Class A amp coming out soon. It sounds amazing - full time SE push pull Class A Alpha Nirvana topology with 250 damping factor for bass so unbelievable woofer cone control.

I will also be developing a hybrid tube buffer Class D amp with 350wpc for a client as a commercial amp. Still early stages.

 

[Plott]

Thanks for the reply. My concern with Class A amps is the behavior at "weird" speakers on terms of strange impedance curve. It's mostly not in the bass range, rather in the mids, and it can cause a shouty midrange without control.

Your Class D plan is great - but being a commercial thingie, no chance

 

[xrk971]

The A40 is class A but has the oomph of a solid Class AB. I wouldn’t worry about weird speakers or shouty sounding.

 

[Plott]

Cool 👍🏻 but also a commercial design... unless you plan a GB

 

[xrk971]

You could just build the Alpha Nirvana. Same amp. Add the SFPP and SSR speaker protects. Add the SLB power supply if you want to go all out.

https://www.diyaudio.com/community/threads/alpha-nirvana-39w-8ohm-class-a-amp.344540/

Here is an example of the Alpha Nirvana in an exquisite build by Sledwards:

Here is listening impressions by Poseidonsvoice:
https://www.diyaudio.com/community/threads/alpha-nirvana-39w-8ohm-class-a-amp.344540/post-6987070

His build is also very impressive but I can’t find the thread off the top of my head.

The amp itself is quite simple all through hole parts.

 

[Plott]

Wow. Thanks X, I have to think about it, but it looks really great.
What's the difference between A40 and Alpha Nirvana, if any (if it's not a secret, which of course I would understand)?
The boards are in the shop; there is an SFPP with lot of SMD (no go for me), and an SFP with soldered SMDs - would it be okay too?
I fear a new project is born... 🙈

 

[xrk971]

Same amp but A40 has on board CRC PSU.