Class D Audio, Who are these guys?

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#242
Ok, single ended, nice to know

Im not a fan of balanced as such
To me it does seem to offer tighter more controlled sound
In some cases it may sound slightly "mechanical", with slightly forward mid and top, more "bright"
Maybe due to the improved control, i dont know
Some would say less "musical"
Others would say more clean
But I guess it depends

But balanced is in general way overrated
But usually needed with pro gear
 
#244
fwki said:
Hi, I'm new to this forum and diy audio, lurking here for a bit though. I'm building a custom "juke box" PC and want to pull the trigger on the 125wpc Super D. I posted about this project in Source - PC Based...http://www.diyaudio.com/forums/pc-based/159045-my-ideal-amplifier-pc-2.html . TIA......I'm sure I'll need some help.
Click to expand...

You wont be disappointed, install is pretty straight forward. No soldering on the board is needed now with the attached molexs. Ask Tom to set it up for single ended input if not using balanced. Its just several jumpers but makes it eaisier.
PM me if you have questions and Tom is very prompt to reply with emails.
 
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#245
Here is some info Tom sent me on the new inputs, it mentions that single ended also take advantage of the technology which is what i have experienced. Cant help but wonder if balanced is even better.

“The patented InGenius balanced line receivers overcome a serious limitation of conventional balanced input stages: poor common mode rejection in real-world applications. While conventional input stages measure well in the lab and perform well on paper, they fail to live up to their CMRR specs when fed from even slightly unbalanced source impedances — a common situation in almost any pro sound environment. This is because conventional stages have low common-mode input impedance, which interacts with imbalances in source impedance to unbalance common-mode signals, making them indistinguishable from desired, balanced signals. Developed by Bill Whitlock of Jensen Transformers, the patented InGenius input stage uses clever bootstrapping to raise its common-mode input impedance into the megohm range without the noise penalty from the obvious solution of using high-valued resistors. Like transformers, InGenius line receivers maintain their high CMRR over a wide range of source impedance imbalances — even when fed from single-ended sources. But unlike transformers, these wide bandwidth solid state devices offer dc-coupling, low distortion and transparent sound”
Click to expand...
 
#247
In case this isn't known: the InGenius circuit was invented by people at Jensen transformers
www.jensen-transformers.com/an/generic%20seminar.pdf and chips designed for it are made by THAT corporation THAT Corporation 1200-series InGenius High CMRR Balanced Line Receiver ICs.

It actually is a pretty cool circuit, does a very good job of isolating inputs from ground loops, like an isolating transformer but better in a lot of ways. You can even make the circuit using regular opamps, see the diagrams at the links.
 
#249
I dont have any answers to your tech questions but i can tell you the distortion levels must be off the charts. No matter how loud i turn it up it up it still remains crystal clear. I have never heard a system that didnt kinda breakup at some point.
 
#251
A little update I replaced the stock Nichicon caps that came with the standard power supply with some Panasonic TS-HA caps. I increased the uf to 40k and got a real nice bump in bass and mid bass. Much more dynamic sounding and better seperation.
I used 4@10,000uf and still have two slots open to experienment with adding more. Highly reccomend. SuperD at 125wpc.

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#256
Okay I've been following this thread for a while now, just haven't got one yet, however I have a pioneer m-90 that has issue, if I can't fix it, I think I am going to put two of these boards in the case I think the power supply should work, there are two modes on it for 8 or 4 ohm loads which give 72v and 54v power I think the 54v should work, now what boards to get? I want it to be a power house, so I will use two boards in bridged mode, but what sound better? The ti or the cda? Thanks
 
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