restorer-john
Grand Contributor
Mine has had the entire OPAMP board removed so it's pure stereo only (no bridged mono).
So you've also re-labelled (changed the black to red) of the right channel speaker output jack from (-) to (+) I hope.
Mine has had the entire OPAMP board removed so it's pure stereo only (no bridged mono).
That might require the test circuit's load Wattage capacity increased and possibly the test AC supply mains being up'd too. The Rotel is a beast for sure. @amirm might chime in as per if his circuit parameters can test a Rotel RB-991. What is the max test parameter for a home amp?This review makes me wonder how my Rotel RB-991 would fare.
Don't you have to do this at high power to see anything through the noise?Hehe. Since it is for good cause, here you go:
View attachment 68262
I also tested at higher bandwidths and it just increased the noise level. There is no correlated crosstalk distortion that I can see at zero crossing.
I have Ncore based amps, and there isn't a single microcontroller in it. I'm not saying there isn't one in the M22, but why would it be "full of microcontrollers" .
Don't you have to do this at high power to see anything through the noise?
I stopped reading at this comment. PICs are not fragile. I was qualifying PICS to 177C constant operating temp with a unknown amount of extremely high G's in a 20KPSI environment. Used in down-hole petroleum drilling and other geophysical metering operations like what appeared to be volcanoes.PICs are fragile.
I stopped reading at this comment. PICs are not fragile.
We ran ~8% qualifying PIC rate in the oven overnight and then when MODs where made to the assembly and construction process the rate went to ~15%. We where apparently purchasing the best PICs that we could source.Electrically fragile. You can tell the bag of dead ones I have here otherwise. I've completely lost count of dishwasher, oven and refrigerator PICs that render entire controller boards and appliances a write-off. And my other favourite? Gate controllers. One electrical storm and your board is toast- thanks PIC.
They are better than the AMTEL ATMEGA MCs though, I'll give them that.
This amp is class G, not AB
That might require the test circuit's load Wattage capacity increased and possibly the test AC supply mains being up'd too. The Rotel is a beast for sure. @amirm might chime in as per if his circuit parameters can test a Rotel RB-991. What is the max test parameter for a home amp?
Is it the ABH2?Don’t tell, people will get confused.
A Class H amp owner.
That's a lot of heatsink!A lot of old NAD amplifiers: https://quirkaudio.com/?page_id=707
Resized and optimized
View attachment 68073
Is it the ABH2?
Edit: Ha ha I flubbed that one up! Is it the AHB2?
So you've also re-labelled (changed the black to red) of the right channel speaker output jack from (-) to (+) I hope.
Now i'm realy qurious how my NAD C370 will measure. It will come close or surpass the NAD 2200 i guess.There is one online review and it showed very similar power and distortion figures to mine. So I say they are probably close.
Hm i have a NAD C370 that runs now for more than 17 years no problems what so ever. I think the amount of NAD's produced like the C370 in the ten or hunderd of thousends can obtain some problematic amplifiers in comparison to amplifiers brands that are producec a few thousend or less i guess.The main culprit with NAD is that they often fail and you can be sure they do. It's a good amplifier to buy if you can get it for cheap and fix it yourself.
Their AVR's and C3xx series are the best (worst?) example - mediocre solder job, cheapest capacitors money can buy and very questionable if not stupid design decisions to place capacitors in pretty much sealed cans with class A driver stages or directly next to a hot heatsink of a voltage regulator.
I've done a 370 once, never ever again. Had to replace almost every electrolytic capacitor and have spent hours fixing bad solder joints on the thing.
You have about 100% chance it's already partially decayed if you find one for sale online.
And don't even start me on their CDP's....great while they work but they break down due to mysterious reasons, not only because of laser and electrolytics failing.
It's a shame because otherwise NAD gear really does sound very good and often delivers more than what they promise.
I have a C370 too. You can find measurements here. Unfortunately it does not stack up to the 2200 in power or THD+N, In fact, here is an example where the elusive crossover distortion seems to be showing itself a little bit.Now i'm realy qurious how my NAD C370 will measure. It will come close or surpass the NAD 2200 i guess.