Moon by Simaudio Neo 230HAD D/A headphone amplifier Page 2

Tue, 08/30/2016

COMMENTS
philipjohnwright's picture

It's what differentiates SF; writers like Herb, the much-missed SM, and the too-early-to-say-but-showing-distinct-promise Jana. Along with all the old (sorry guys) favourites

Keep them coming please John; earnest, humourless,colourless reviewers abound elsewhere; don't let them through the door here.

woodford's picture

you're probably already familiar, but there are wonderful 60s era phillips recordings of the Beethovem, Brahms, and Mendelssohn concerti with Haitink conducting. the Brahms is a particular favorite.

fourpobs's picture

As finish my coffee and get ready to put my butt-kissing suit on for a day in the corporate mines, the first couple paragraphs remind me there must be a way to make a living, have good audio and know interesting, inspiring people(perhaps even be an interesting person. Maybe even a "character"). I will read the rest of the article later on but thanks for that.

Anton's picture

Would this pass as a part of the definition of 'euphonic?'

"Even close-miked instruments are surrounded by a bit of moist air. The microZOTL's transparency surrounds instrumental tones with a kind of vibrating aura."

If it does that to everything, then it would strike me as being 'artifactual.'

Prediction: I think some key words that will appear in the Pass Labs review will be: composed, unruffled, effortless, matter of fact (in the best way, as in 'it possessed a matter of fact control and level of detail that made everything it did seem effortless.')

I really hope you like it. I think Pass Labs' amplification would be on my ownership list if I had adequate scratch!

Cheers, and thanks for a fun all around review!

audiodoctornj's picture

Herb a great review on, no doubt a great product, I would like to call your attention to, the Nuprime DAC 10H which is only $200 dollars more, than the Sim product you reviewed.

[Advertising copy deleted by John Atkinson]

We, Audio Doctor, www.audiodoctor.com have the Nuprime on display and have been supporting the first iteration of the company, Nuforce, and now in its second incarnation, Nuprime for years.

[Advertising copy deleted by John Atkinson]

Herb I would love to have you over to the shop to hear the Nuprime for yourself we are only three miles away from you, it is really something special.

Pages

Moon by Simaudio Neo 230HAD D/A headphone amplifier

I am a lucky person. Who gets to be an artist, an aspiring griot, and a Stereophile reporter? Who gets to stay at home in paint-smeared pajamas, draw pictures of teapots and barn owls . . . and then, on top of everything, gets paid to listen to music made by Henryk Szeryng, Eugene Hütz, and Winston Reedy? C'est moi!

I have groovy friends, too: other eccentric artists, scruffy musicians, recording and mastering engineers, beekeepers, authors and editors, art and junk collectors, tube wizards, turntable savants, DJs, Mensa-type amp designers, bat-shit-crazy poet-philosophers, and unrepentant hoarders.

Tue, 08/30/2016

Audio Alchemy DPA-1M monoblock power amplifier Measurements

Tue, 08/30/2016

COMMENTS
funambulistic's picture

To me, that was what AA was - innovative products at (reasonably) affordable prices, which is just like the new Schiit. They had an extensive line of kit, ranging from quite affordable to just out of reach (by my financial standards). I had an AA DLC (Digital Line Converter) and it was the best pre-amp I have ever owned. Congrats to the new AA but their prices are gradually becoming too dear. Stick to the basics, AA, and give us those those affordable products!

Anton's picture

Dude, that is the new 'affordable!'

;-D

georgehifi's picture

Att JA:
Please go back to showing what coming out of the output with the square wave shots as you normally do with Class D, instead of filtering it all out???? As what you've shown, this is not what gets to the speakers and i think is a bit misleading?

Quote JA: "I used, ahead of the analyzer, an Audio Precision AUX-0025 passive low-pass filter, which eliminates noise above 200kHz that would otherwise contaminate the measurements; for the 1kHz output power tests, I also used a 20kHz brickwall low-pass filter."

Cheers George

John Atkinson's picture
georgehifi wrote:
Please go back to showing what coming out of the output with the square wave shots as you normally do with Class D, instead of filtering it all out????

The only difference is that the tops and bottoms of the squarewave are obscured by HF noise, the level of which I still mention in the text. See, for example, fig.13 at http://www.stereophile.com/content/bel-canto-design-black-amplification-system-measurements. If I filter the noise, you can then see overshoot and ringing, when it exists, which I think more significant.

John Atkinson
Editor, Stereophile

georgehifi's picture

I find it more informative to see the HF noise on the square wave, this then gives me an indication of how good the manufacturers filtering is, as it's shown now it say nothing, because it's not the real thing.

Cheers George

dce22's picture

In ucd and ncore design it's the same squarewave + 400khz 350milivolt RMS sinewave added nothing special.

On the 7th page (the last page) you can see UCD switchmode signal on high bandwith analog scope that can capture couple Mhz more than AP can and on the 6th page you can see bad Class D that pollute the airwaves
http://www.hypex.nl/docs/appnotes/EMI_appnote.pdf

The use of AUX-0025 low pass filter is not needed for measuring ucd/ncore class d(it's better not to use it the big coil of wire pickup noise and distort the signal), but you have to switch on AES17 filter so that 400khz signal not miscalibrate the AP scale.

The guy who design ucd class d does not have AUX-0025
http://repforums.prosoundweb.com/index.php/topic,327.msg5253.html#msg5253

Cheers.

Les's picture

It would have been interesting to compare this to the NAD M22, which is based on the more advanced (?) nCore module. While not a monoblock and not as powerful, the M22 is at least priced accordingly (compared to the DPA-1M). I would imagine a person looking into the AA amp would also consider the NAD M22 as well...

Pages

Audio Alchemy DPA-1M monoblock power amplifier Associated Equipment

Tue, 08/30/2016

COMMENTS
funambulistic's picture

To me, that was what AA was - innovative products at (reasonably) affordable prices, which is just like the new Schiit. They had an extensive line of kit, ranging from quite affordable to just out of reach (by my financial standards). I had an AA DLC (Digital Line Converter) and it was the best pre-amp I have ever owned. Congrats to the new AA but their prices are gradually becoming too dear. Stick to the basics, AA, and give us those those affordable products!

Anton's picture

Dude, that is the new 'affordable!'

;-D

georgehifi's picture

Att JA:
Please go back to showing what coming out of the output with the square wave shots as you normally do with Class D, instead of filtering it all out???? As what you've shown, this is not what gets to the speakers and i think is a bit misleading?

Quote JA: "I used, ahead of the analyzer, an Audio Precision AUX-0025 passive low-pass filter, which eliminates noise above 200kHz that would otherwise contaminate the measurements; for the 1kHz output power tests, I also used a 20kHz brickwall low-pass filter."

Cheers George

John Atkinson's picture
georgehifi wrote:
Please go back to showing what coming out of the output with the square wave shots as you normally do with Class D, instead of filtering it all out????

The only difference is that the tops and bottoms of the squarewave are obscured by HF noise, the level of which I still mention in the text. See, for example, fig.13 at http://www.stereophile.com/content/bel-canto-design-black-amplification-system-measurements. If I filter the noise, you can then see overshoot and ringing, when it exists, which I think more significant.

John Atkinson
Editor, Stereophile

georgehifi's picture

I find it more informative to see the HF noise on the square wave, this then gives me an indication of how good the manufacturers filtering is, as it's shown now it say nothing, because it's not the real thing.

Cheers George

dce22's picture

In ucd and ncore design it's the same squarewave + 400khz 350milivolt RMS sinewave added nothing special.

On the 7th page (the last page) you can see UCD switchmode signal on high bandwith analog scope that can capture couple Mhz more than AP can and on the 6th page you can see bad Class D that pollute the airwaves
http://www.hypex.nl/docs/appnotes/EMI_appnote.pdf

The use of AUX-0025 low pass filter is not needed for measuring ucd/ncore class d(it's better not to use it the big coil of wire pickup noise and distort the signal), but you have to switch on AES17 filter so that 400khz signal not miscalibrate the AP scale.

The guy who design ucd class d does not have AUX-0025
http://repforums.prosoundweb.com/index.php/topic,327.msg5253.html#msg5253

Cheers.

Les's picture

It would have been interesting to compare this to the NAD M22, which is based on the more advanced (?) nCore module. While not a monoblock and not as powerful, the M22 is at least priced accordingly (compared to the DPA-1M). I would imagine a person looking into the AA amp would also consider the NAD M22 as well...

Pages

Audio Alchemy DPA-1M monoblock power amplifier Specifications

Tue, 08/30/2016

COMMENTS
funambulistic's picture

To me, that was what AA was - innovative products at (reasonably) affordable prices, which is just like the new Schiit. They had an extensive line of kit, ranging from quite affordable to just out of reach (by my financial standards). I had an AA DLC (Digital Line Converter) and it was the best pre-amp I have ever owned. Congrats to the new AA but their prices are gradually becoming too dear. Stick to the basics, AA, and give us those those affordable products!

Anton's picture

Dude, that is the new 'affordable!'

;-D

georgehifi's picture

Att JA:
Please go back to showing what coming out of the output with the square wave shots as you normally do with Class D, instead of filtering it all out???? As what you've shown, this is not what gets to the speakers and i think is a bit misleading?

Quote JA: "I used, ahead of the analyzer, an Audio Precision AUX-0025 passive low-pass filter, which eliminates noise above 200kHz that would otherwise contaminate the measurements; for the 1kHz output power tests, I also used a 20kHz brickwall low-pass filter."

Cheers George

John Atkinson's picture
georgehifi wrote:
Please go back to showing what coming out of the output with the square wave shots as you normally do with Class D, instead of filtering it all out????

The only difference is that the tops and bottoms of the squarewave are obscured by HF noise, the level of which I still mention in the text. See, for example, fig.13 at http://www.stereophile.com/content/bel-canto-design-black-amplification-system-measurements. If I filter the noise, you can then see overshoot and ringing, when it exists, which I think more significant.

John Atkinson
Editor, Stereophile

georgehifi's picture

I find it more informative to see the HF noise on the square wave, this then gives me an indication of how good the manufacturers filtering is, as it's shown now it say nothing, because it's not the real thing.

Cheers George

dce22's picture

In ucd and ncore design it's the same squarewave + 400khz 350milivolt RMS sinewave added nothing special.

On the 7th page (the last page) you can see UCD switchmode signal on high bandwith analog scope that can capture couple Mhz more than AP can and on the 6th page you can see bad Class D that pollute the airwaves
http://www.hypex.nl/docs/appnotes/EMI_appnote.pdf

The use of AUX-0025 low pass filter is not needed for measuring ucd/ncore class d(it's better not to use it the big coil of wire pickup noise and distort the signal), but you have to switch on AES17 filter so that 400khz signal not miscalibrate the AP scale.

The guy who design ucd class d does not have AUX-0025
http://repforums.prosoundweb.com/index.php/topic,327.msg5253.html#msg5253

Cheers.

Les's picture

It would have been interesting to compare this to the NAD M22, which is based on the more advanced (?) nCore module. While not a monoblock and not as powerful, the M22 is at least priced accordingly (compared to the DPA-1M). I would imagine a person looking into the AA amp would also consider the NAD M22 as well...

Pages

Audio Alchemy DPA-1M monoblock power amplifier Page 2

Tue, 08/30/2016

COMMENTS
funambulistic's picture

To me, that was what AA was - innovative products at (reasonably) affordable prices, which is just like the new Schiit. They had an extensive line of kit, ranging from quite affordable to just out of reach (by my financial standards). I had an AA DLC (Digital Line Converter) and it was the best pre-amp I have ever owned. Congrats to the new AA but their prices are gradually becoming too dear. Stick to the basics, AA, and give us those those affordable products!

Anton's picture

Dude, that is the new 'affordable!'

;-D

georgehifi's picture

Att JA:
Please go back to showing what coming out of the output with the square wave shots as you normally do with Class D, instead of filtering it all out???? As what you've shown, this is not what gets to the speakers and i think is a bit misleading?

Quote JA: "I used, ahead of the analyzer, an Audio Precision AUX-0025 passive low-pass filter, which eliminates noise above 200kHz that would otherwise contaminate the measurements; for the 1kHz output power tests, I also used a 20kHz brickwall low-pass filter."

Cheers George

John Atkinson's picture
georgehifi wrote:
Please go back to showing what coming out of the output with the square wave shots as you normally do with Class D, instead of filtering it all out????

The only difference is that the tops and bottoms of the squarewave are obscured by HF noise, the level of which I still mention in the text. See, for example, fig.13 at http://www.stereophile.com/content/bel-canto-design-black-amplification-system-measurements. If I filter the noise, you can then see overshoot and ringing, when it exists, which I think more significant.

John Atkinson
Editor, Stereophile

georgehifi's picture

I find it more informative to see the HF noise on the square wave, this then gives me an indication of how good the manufacturers filtering is, as it's shown now it say nothing, because it's not the real thing.

Cheers George

dce22's picture

In ucd and ncore design it's the same squarewave + 400khz 350milivolt RMS sinewave added nothing special.

On the 7th page (the last page) you can see UCD switchmode signal on high bandwith analog scope that can capture couple Mhz more than AP can and on the 6th page you can see bad Class D that pollute the airwaves
http://www.hypex.nl/docs/appnotes/EMI_appnote.pdf

The use of AUX-0025 low pass filter is not needed for measuring ucd/ncore class d(it's better not to use it the big coil of wire pickup noise and distort the signal), but you have to switch on AES17 filter so that 400khz signal not miscalibrate the AP scale.

The guy who design ucd class d does not have AUX-0025
http://repforums.prosoundweb.com/index.php/topic,327.msg5253.html#msg5253

Cheers.

Les's picture

It would have been interesting to compare this to the NAD M22, which is based on the more advanced (?) nCore module. While not a monoblock and not as powerful, the M22 is at least priced accordingly (compared to the DPA-1M). I would imagine a person looking into the AA amp would also consider the NAD M22 as well...

Pages

Audio Alchemy DPA-1M monoblock power amplifier

To those who were into audio in the late 1980s and early '90s, the name Audio Alchemy is a familiar one. I've owned DACs and jitter-reducing devices made by Audio Alchemy and Perpetual Technologies (the first successor to the original AA) and found them to provide excellent performance at modest prices. Indeed, at the time, many in the industry felt that the Audio Alchemy products were underpriced, leaving too little room for profit, and that this led to the company's demise. The new Audio Alchemy—led by its original designer, Peter Madnick, and having on staff other employees from the old AA—is what Madnick describes as a "grown-up" version of the original company, maintaining "the brand's original ethos of superior technology and value." And the prices, while quite reasonable for the performance they seem to offer, appear high enough to allow the new AA to survive.
Tue, 08/30/2016

Rudy in Birdland

Art Blakey’s A Night At Birdland, Vol. 1 remains a landmark of both bebop and the earliest live recordings of jazz in a club setting.
Mon, 08/29/2016

Cans, You Dig It?

The graphic above was created with data provided to me by the CTA (Consumer Technology Association). I understand that this data cannot possibly account for every single pair of headphones sold in any given year, but I believe that this is the most accurate account of data currently available to us.
Mon, 08/29/2016

NAD, Bluesound, MQA Demonstration in Florida Wednesday

Wednesday August 31, 6:30–8:30pm, Encore Home Entertainment Systems (2115 Siesta Drive, Sarasota, FL 34239) is hosting a special NAD/PSB/Bluesound event. Travis Huff, the Central Regional Sales Manager for Lenbrook America, parent company of NAD, PSB, and Bluesound products, will be discussing and demonstrating the introduction of the Master Quality Authenticated (MQA) audio codec into NAD and Bluesound components for 2016. Featured models include the NAD MDC module and all six Bluesound network-streaming player, speakers, and electronics products.
Mon, 08/29/2016

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