Musetec (LKS) MH-DA005 DAC

You are taking me away from listening to music - I will respond to you but not americanspirit as he/she makes no logical sense. I have listened to enough gear to know that I like sources and speakers that are "straight up" but amplifiers that add a little cream to the coffee - either big class A or tubes. 

You're right - there were no measurements of the Ars when I purchased it - I relied on the speaker designer himself using this amp to voice the speakers and present them at shows. I am fairly confident that in my nearfield setup, moderately sized room, and easy load speakers, this 30W amp pushes out the requite 5-10 watts needed for 75-85 db listening with low distortion and a little room left over for dynamics. I recently brought home a lovely sold state Luxman integrated for comparison and got to experience all I am missing and gaining from this tube amp.

IF measurements showed this amp to have an obvious engineering flaw - frequency modulations, gross distortion at moderate power, excessive power supply noise - then I would be pissed. It bothers me that expensive gear may come with "scratches and dents." A $10,000 amp recently measured in Stereophile had a 2 db channel imbalance and other measured anomalies that were linked to a cold solder joint. 

Can audio components be designed entirely by ear- exchanging capacitors in the circuit based on the sustain of a piano in one recording or the input jacks based on one singer's voice? I don't think so. Maybe there is a rare unicorn with the requisite skills, absolute perfect pitch, and access to reference recordings. Otherwise,  engineering and measurements are important pieces to this puzzle. 

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@batvac2

Can audio components be designed entirely by ear- exchanging capacitors in the circuit based on the sustain of a piano in one recording or the input jacks based on one singer’s voice? . . . . Maybe there is a rare unicorn with the requisite skills, absolute perfect pitch, and access to reference recordings.

Well, not a unicorn exactly. Just a trained engineer--caring more about audio design than marketing--with a fine ear, a love of music, and the requisite skills. Perfect pitch not required. He would not be the only one in the history of high-end audio.

You seem to have put together an audio system that deserves better than the Topping as your source. Sooner or later you’ll want to trade up. By your selections, I’m guessing that you look for good value. Having hung around here for a while, the Musetec must be tempting. The testimonies here and elsewhere surely suggest that it is in the category of DACs costing far more. I’ll leave it at that.

Always comes down to a very simple question. Who is one trying to please, measuring bot or oneself?

I have Merlin VSM-MM as second speakers, I purchased based on a number of listening sessions at audio shows and speaking with Bobby. Yes, Bobby generally partnered with Ars Sonum, and I did find pairing alluring. Bobby chose this pairing based on his listening preferences, measurements played role in that he understood what was required of partnering amp. Virtually any solid state, push pull tube could adequately power the Merlins, Bobby chose Ars Sonum based on subjective listening tests.

And speaking of capacitors and ability to hear differences with this particular part exchange. Merlins originally came with Hovland caps in both speaker crossover and BAM, I was perhaps first to mod VSM with Duelund VSF caps. Result was far more natural timbre, greater transparency, resolving powers. I called Bobby with great enthusiasm for mod, Bobby not too happy with me, but could detect a fair amount of curiosity in regard to mod. And so, a few months later, Bobby comes out with new iteration of VMS with Duelund VSF caps!  Point of this is, some are very familiar with certain sound qualities of systems and/or components, small changes can be extremely salient with this level of familiarity. These are not differences you're going to hear in double blind tests or short term listening with just a few recordings. Long term listening with wide variety of recordings in static setup required to detect these differences.

Musetec used above method to arrive at final sound qualities of 005, designer and/or designers used their ears and sonic preferences in voicing this dac. Assume measurements sacrificed for particular sound qualities.

Lastly, I would hope every designer of quality audio components has at least one audio system, preferable a number of them to voice those components. And the quality of that system, and the sonic preferences of designer certainly play a great role in final voicing. When preferences of designer and listener align we have sympathetic match!

Measuring bots and I not sympathetic match!

I spoke with Bobby a few times about his speakers - super nice guy. Apparently, massed choir was his passion. Which brings me to your point about voicing. I recently decided to learn some basics about audio, purchased a UMIK, and started making measurements- including simulated anechoic, on axis, off axis... My Merlin VSM-MXM have a clear 4-7db hump from about 700-1000 hz. With a lot of experimentation, I was able to create a reliable convolution filter that yields a smooth harman-like frequency response at the listening position (and emulates the BAM digitally so I could remove this). The filter - to my ears - is a real improvement - but the amount of improvement varies by music type. And one type of music actually seems to sound best (to me) without any correction: massed voices. As I hear it, goosing up the 700-1000hz region gives multiple singers a more "spread out" presentation. 

For this, and other reasons, I more skeptical than you about audio designers being able to reliably pull off the trick of voicing.