And what difference would that make (considering most hifi amps are unbalanced and have no common mode rejection at all)?
0.1% tolerance will not be good enough for superhigh CMRR. 0.01% gives you 74dB. See link:
What you need to know about CMRR- The instrumentation amplifier (part 2) - Analog - Technical articles - TI E2E support forums
Probably Bruno already uses 0.1% resistors. These resistors are affordable, going lower quickly increases the price.
Yes. As long as they are purely personal opinions. To go beyond that requires evidence and verification.
That's one of your stock remarks, Julf.
Discussions on audio forums are always based on/inspired by objective data and personal opinions; that's why these discusions are there...
Your quest for evidence and verification makes sense for objective data (Bruno is doing exactly that....searching and finding (hysteresis distortion) the cause of granularity in Ncore sound) ; by repeatingly mentioning th evidence/verification thing, you actually question someones personal opinion which does not make sense.
Inspired by, perhaps yes, but fortunately there are forums that don't pay much attention to purely personal opinions. The problem with personal opinions is that everyone has them, but not all are equally valid.
Not questioning. An opinion is an opinion. Just pointing out that a personal opinion is not the same as a fact (something people often seem to forget).
There's a DSP crossover over in the vendors' bizarr section, that has a "tube amp simulation" as an EQ option (it may not be just EQ). This kind of thing sounds similar, and right at the digital cross-over stage for active speakers.
To extrapolate that which we and i also agree..
Perhaps it is just as valid then to change your opinion, rather than for the amps to change.
Following this - looks like a very smart solution. I hope it's competitive on price.
What's "competitive price" is obviously relative. This is not a low cost amplifier. The cabinet is cut out in one thick alu block and the amp has no seams or visible screws (only screws underneath). A chassis like that raises the cost.
The design of the buffer as well as other functions and have taken a lot of time and brings up the cost with the parts needed too.
However, if you compare it with what's available in the commercial market with similar quality chassis and power, I think you'll find it very competitive.
The starting price is 23 200 NOK (Norwegian kroners) without VAT and shipping. That's approximately £1970 or 2300 euros with today's currency.
It's worth noticing that this amp has much lower distortion in the low frequencies compared to some other NC500 based amplifiers.
I have opened a new thread: Vera Audio Class-D Amp Build Quality | Audio Science Review (ASR) Forum.
With pictures resized, optimized and clarified to see details.
and three more.
With pictures resized, optimized and clarified to see details.
and three more.
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What nc500 amp are you running.
I run mine without an input buffer which lowers the gain to 13db, I think, was a long time ago I looked. Their input impedance is very low though will need something stiff to drive them.
You need the Hypex OEM buffers and a soldering iron if you want to do that or some knowledge.
Most of the nc500’s buffers are questionable but may suit your preference
Q. When is a buffer not a buffer.
A. When it's a Hypex buffer.
The term "buffer" is used by Hypex but for technical correctness it's really a preamplifier with roughly the same voltage gain as the NC500 / 1200 module, and also converts unbalanced inputs.
The ultimate implementation would be to use (build) a dedicated external class A discrete preamplifier that's capable of driving 12vrms into a 600 ohm impedance with very low distortion. This is something I intend to do.
Btw, I use NC500 mono amps to drive woofers (B&W 800di) and they sound fantastic. Great full range too but I slightly prefer the treble from my blameless class AB amp. Subjectively it's just a bit sweeter and more open and extended
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