[FredA]

There is no doubt the AC power is probably the most important aspect of an audio system. I am listening on Sat AM when all its quiet, and it sounds superb with the R7. I use PS Audio Harvester to monitor the noise from my AC and found a better receptacle that much quieter than the really noisy one that I used to use. It blinks when there is AC noise and supposedly gets rid of the noise as light energy. Now it is not really blinking much. But on normal evenings in weekdays, it blinks like crazy. So the HE option makes lots of sense. I wish Kingwa still has the HE regenerator on its own so one can hook up more components. It may likely works better with individual HE for each device. But I definitely need one for my PC, the noisiest of all my components. I already use 2 isolators but the AC noise is still an issue, hence I am planning to get a power regenerator based on the UPS (interrupted power supply) technology used in commercial industry, where AC is converted to battery DC and then back to AC again, see attached pdf.

Indeed, the he even things out to a great extent over a week. The regular version does not reach quite the same heights, but it is nonetheless an exceptional dac when ac is good.

 

[FredA]

Yes, you're correct.

I was talking to Kingwa about DC on mains a while ago, he said it will affect all his products that use toroidal transformers. The power amps will be the most affected since they have the largest transformers of all.

I am checking for a dc blocker now, thanks for the idea!

 

[Jackula]

I am checking for a dc blocker now, thanks for the idea!

No problems Hoping you can get a good margin of improvement with one!

I've seen cheaper DC blockers than the Holton one, but the Holton one uses very nice components, using four 100,000uf capacitors to filter both DC and HF noise. The same capacitors used in his international award-winning amplifiers.

 

[FredA]

No problems Hoping you can get a good margin of improvement with one!

I've seen cheaper DC blockers than the Holton one, but the Holton one uses very nice components, using four 100,000uf capacitors to filter both DC and HF noise. The same capacitors used in his international award-winning amplifiers.

I am taking note of this.

 

[Jackula]

Indeed, the he even things out to a great extent over a week. The regular version does not reach quite the same heights, but it is nonetheless an exceptional dac when ac is good.

I've always wondered what "HE" stands for, I wonder if it simply refers to Kingwa's Chinese name - "Qinghua He".

 

[Chopin75]

I am checking for a dc blocker now, thanks for the idea!

Check out these:

https://www.atlhifi.com/shop/fully-assembled-devices/dc-blocker-trap-filter-assembled-in-case/

https://avahifi.com/collections/used-demo-and-quick-ship/products/humdinger-dc-line-blocker

 

[PLGA]

I use a Holton DC Blocker in my system and its makes a good improvement in SQ.

I believe its a nice and somehow no too expensive upgrade to consider.

 

[Jackula]

Kingwa has been reading this thread and is now offering an optional DC blocker on all of his power amps now.

 

[motberg]

I wonder how a 1704uk would sound with HE power... hmmm

sounds wonderful - I use a HE350 + NOS7 + Gustard U16 (w/GPS 10M clock)... fantastic PCM setup

but this (discontinued HE7S) would probably be better for most folks looking for this flavor
http://www.audio-gd.com/HE/HE7S/HE7SEN.htm

Kingwa's flagship 1704UK stuff is classic... I will never sell the NOS7

 

[FredA]

Check out these:

https://www.atlhifi.com/shop/fully-assembled-devices/dc-blocker-trap-filter-assembled-in-case/

https://avahifi.com/collections/used-demo-and-quick-ship/products/humdinger-dc-line-blocker

I will probably give this guy's unit a try.

 

[Chopin75]

I will probably give this guy's unit a try.

The Atlhifi guy ? You can even buy the PCB from him and make your own. He also has some with filters.

 

[FredA]

The Atlhifi guy ? You can even buy the PCB from him and make your own. He also has some with filters.

Yep. Ordered his finshed unit off ebay for 100usb before shipping. I measured a 30mV offset on my line this morning. So hopefully, it will help.

 

[ToddRaymond]

You'd have to chop each HE-2 monoblock in half to ship it. Even with the Master 2H, my understanding is Kingwa sends the monoblocks in separate packaging because they exceed the weight limit when combined.

Ahh, okay. Thanks for that. That's too bad.

 

[darren700]

Im really starting to get jealous of the features in the new 2020 R-7. My first gen R2R-7 is starting to feel really outdated.
I have a DI-20 on the way and I would love to be able to connect the clock output of the DI-20 to my R2R-7 and bypass the TXCO clocks like the new R7 2020 version.
However im assuming this was a hardware change not software so i'm out of luck? Has anyone asked Kingwa about clock input on older R2R-7's?

 

[ungawa]

Im really starting to get jealous of the features in the new 2020 R-7. My first gen R2R-7 is starting to feel really outdated.
I have a DI-20 on the way and I would love to be able to connect the clock output of the DI-20 to my R2R-7 and bypass the TXCO clocks like the new R7 2020 version.
However im assuming this was a hardware change not software so i'm out of luck? Has anyone asked Kingwa about clock input on older R2R-7's?

With you on this one - and its all happened so fast!
I've only just replaced the internal TXCO's and am enjoying the changes there - but woah - step away for a second and the place has blown up with new ideas and upgrades!