Being recent models, the chance of even getting a peek at a schematic is very slim. Even service agents will need access codes to the encrypted tech. details so unless they want a lawsuit for breaching confidentiality agreements, they won't be sharing schematics either - for quite a few years, I'd guess. 
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Try repairing one.
The design, construction, and materials used are all, unpleasant.
Very few repairers want anything to do with them.
They don't reply to emails.
Better still, have a look at all the forums and threads of their many failures.
Seems anything designed/sold by 'audio partners' is a migraine in the waiting.
The design, construction, and materials used are all, unpleasant.
Very few repairers want anything to do with them.
They don't reply to emails.
Better still, have a look at all the forums and threads of their many failures.
Seems anything designed/sold by 'audio partners' is a migraine in the waiting.
I should clarify, I'm not against the circuit design.
Although their are some rather silly choices made there.
It's the assembly design that sucks.
makes it very service unfreindly.
really cheap fibreglass boards that flex and also shrink with heat.
plate throughs that shear.
very poorly soldered.
have to undo and move multiple boards to get limited access to other boards.
have a read through some of the service manuals.
to flash the pic's you need to modify cables.
volume control issues that are mentioned as needing to be modified.
the whole thing just reeks of half hearted effort.
But I still suggest you go looking for postings about faults.
I have one unit here that other repairers can't fix, and I'm about to bin it as well.
I have another 2 units on there way to me, both have been rejected by two other repairers already.
And I know of three other repair shops that will have nothing to do with them due to the issues involved in service or repair.
That really inspires confidence in the brand doesn't it.
Although their are some rather silly choices made there.
It's the assembly design that sucks.
makes it very service unfreindly.
really cheap fibreglass boards that flex and also shrink with heat.
plate throughs that shear.
very poorly soldered.
have to undo and move multiple boards to get limited access to other boards.
have a read through some of the service manuals.
to flash the pic's you need to modify cables.
volume control issues that are mentioned as needing to be modified.
the whole thing just reeks of half hearted effort.
But I still suggest you go looking for postings about faults.
I have one unit here that other repairers can't fix, and I'm about to bin it as well.
I have another 2 units on there way to me, both have been rejected by two other repairers already.
And I know of three other repair shops that will have nothing to do with them due to the issues involved in service or repair.
That really inspires confidence in the brand doesn't it.
All the more reason to leave it on 24/7 to reduce thermal cycling/stress.
Designer
Hi,
Doug Self did design the 840 A & W from what I am told and came up with the Class XD design for the output stages as well.
But, the amps above the 840A like the 840A V2 and numerically up were heavily changed from his design before they were produced. Seems someone decided they could do better and while they kept the XD crossover design, the rest is quite different. Good or bad, only the 840A & W were as designed by him.
Hi,
Doug Self did design the 840 A & W from what I am told and came up with the Class XD design for the output stages as well.
But, the amps above the 840A like the 840A V2 and numerically up were heavily changed from his design before they were produced. Seems someone decided they could do better and while they kept the XD crossover design, the rest is quite different. Good or bad, only the 840A & W were as designed by him.
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