The original kit required soldering, but not the current kit.No soldering ?
Oh man, I need to go learn how to do this, seems like something I would enjoy doing.
The original kit required soldering, but not the current kit.No soldering ?
Oh man, I need to go learn how to do this, seems like something I would enjoy doing.
Also interesting to see what the maximum power output would be if each 1ET400A were driven by a single SMPS1200True.
Would be interesting if you measure only 1 channel of this 1ET400A amp turned on. If it can beat the single nc400 then.
At what frequency?What does the amp’s square wave look like?
There are exceptions. Read the 1st two posts here, and take a close look at #2's 1st photo.
You'd be surprised, maybe, at how easy "good enough" soldering is... Get a soldering iron and a silly project (for practice) from the hobby store near you and try. Purists will correct me, I expect, but ...all you do is heat (by touching with your soldering tip, and holding still) the joint that you want to solder. Touch the solder to the joint itself (not to the soldering tip) and wait. The solder melts like candle wax when the joint gets hot enough to melt the solder. Done. The molten solder flows really quickly into the joint, so all you have to do is hold still for a few seconds. Lift the soldering iron when the lead flows and the joint will cool almost instantly. (Like most things, you can find a hundred good videos on YouTube.)
At what frequency?
No soldering ?
Oh man, I need to go learn how to do this, seems like something I would enjoy doing.
I am not sure what bandwidth JA uses at stereophile. Mine is at 1 Mhz but there is an AES-17 filter in addition:What does the amp’s square wave look like?
Added to the review. Here it is:@amirm could you show the wide spectrum no filter high frequency switching noise, as you did with other class D amps too? Thanks.
Here you go:True.
Would be interesting if you measure only 1 channel of this 1ET400A amp turned on. If it can beat the single nc400 then.
I am glad you asked me this as running in stereo showed that the previous comparison I made was the good channel of Hypex NC400 against the "bad" channel in 1ET400A.Also interesting to see what the maximum power output would be if each 1ET400A were driven by a single SMPS1200
That the Q of the second order low pass behavior is not far away from 0.7?I am not sure what bandwidth JA uses at stereophile. Mine is at 1 Mhz but there is an AES-17 filter in addition:
View attachment 28894
Let me know what you learn.
but if you look at this result you got when you only measured one channel of that nc400-implementation with a shared SMPS, nc400 has even lower distortion, right? So nc400 monoblocks might be "the shit"?
I am glad you asked me this as running in stereo showed that the previous comparison I made was the good channel of Hypex NC400 against the "bad" channel in 1ET400A.
Here is the stereo measurement using identical power supply in both:
View attachment 28902
I refined the graph a bit showing a bit more power now for the 1ET400A. That aside, as noted on the graph, I wonder if the 1ET400A amps are more efficient resulting in higher output power from the same supply.
Have to wonder if the noise is coming mainly from the HYPEX SMPS 1200, and if Bruno is planning to offer an improved Purifi switching PS.Here you go:
View attachment 28899
Note that the lower distortion advantage of Purifi 1ET400A gets lost in the above below max power since noise dominates THD+N.