SUT - electrical theory and practical experience

Dear @holmz ​@lewm ​@intactaudio : My Denon AU-1000 just arrived from its measurements I ask and what I receive of information is that this exxtremely special custom made for Denon Murata SUT transformers has a bandwindth ( my hard silver wired . ): - 1.35db at 3hz ( FR is the champ in tihis frequency range ) and totally flat to -2.5db at 305khz. It's THD 0.001 and noise levels -105db. I understand that the Murata is c0oper wired but superior to the silver Knondo and Ortofon silver wired too.. For me is really good this Denon. Unfortunatelly I did not ask for its rise time.

I own other Murata SUT’s as Entré and Denon AU-340 and even that the Entré transformers looks similar to the AU-340 exist a tiny differences in favor of the Denon, both transformers hard wired with same kind of cable.

Lewm as I told you , the AU-1000 is really near the direct connection to the MC in my phonolinepreamp and this speaks a lot of its quality performance levels.

R.

It looks like Bats are being catered for in the frequencies being presented and being a outcome of a Theorem presented.

@pindac The theory behind wide bandwidth in a zero feedback system has to do with filter theory. In a zero feedback system like a cartridge driving an SUT all the elements are passive so there is no correction.

To prevent phase shift (per filter theory) wide bandwidth is required.

Filter theory as it applies here:

Typically when a single frequency pole is present, it will induce a rolloff at 6dB per octave. Phase shift components of a 6dB slope will be induced down to 1/10th the cutoff frequency (the latter being defined as the -3dB point). That is why you see such wide bandwidths promoted in transformers, which typically have no feedback correction.

(As you may have surmised, if there is feedback correction the need for such wide bandwidth is reduced.)

So an SUT that cuts off at 50KHz will have some phase shift down to about 5KHz. The ear perceives phase shift over a range of frequencies although it cannot perceive it at any one frequency. Over a range of 5KHz to 20KHz where phase shift is induced by a 6dB/ocatve rolloff at 50KHz, the ear will perceive this as a ’darkness’ or ’slowness’; IOW a tonality is assigned. Conversely if there is an zero introduced at 50KHz rather than a pole, the ear will perceive this as a ’brightness’. So to maintain a neutral presentation, the bandwidth is important.

@pindac  : " 

The thread now is grounded with ones intention to attempt to impress their Mathematical Preference as being the better over another.

This attempt to hold centre stage, is being met by others, with a countering of this  very obvious intention at large, especially where the Math has been used as the support for the notion being proposed.

The Mass of Users of Devices as a Listener, do not care for such a Topic of Discussion. "

Who do you think are to came here and tell us what to post or not?, tghis is asother internet forums a free one to post what we want on the audio world.

So if you can go to other forums to preach. For me you are no one especial and only other audfiophile as thousands of thousands out there.

Your statements are TOTALLY wrong like it or not. If you don't like what you read here then just do not read it.Period.

R.

@rauliruegas As you have kindly made a direct contact with myself, I have chosen to read the content of your post.

I usually avoid your posts, as I do not like what I read,  and when a Thread has a value to me, I copy and paste the valuable info, into a Draft Email. This method has been very useful and has been learned as a result of individuals like yourself bombarding a Thread with pointless crap.

From the off-set your attempts has been to knock the use of the Device being inquired about by the OP, where yourself and your cronies have even gone to the extent to derail the made inquiry and insult the OP as suggesting their intention for the thread was to act as a 'Troll'. This early attempt at manipulation of a Thread, and is my opinion the earliest entries to the content that is an attempt to,

" tell us what to post or not? " - Your Words not Mine

I am pleased as a "no one special" -'non ego centric' forum member, along with the multiple thousands you seem to have a similar disregard for, to be one, who has whilst visiting the analog section of Audiogon, have discovered a usable way to avoid having to be caught up in seeing the drivel from yourself and those that are in Cahoots with you. 

It is the Season to be Jolly and during this season there is a acceptance of the odd Preach.

As a Preach, as said before,

"I can easily forgive your outbursts, in the same manner I reserve for Friends, Family and especially my young Grandchildren, who are doing their best to find their way.

I can see your sickness to be recognised as a authority loud and clear, in the same way I see my Grandchild stand in front of a TV when not getting the attention they crave. It does seem this personality trait does manifest most noticeably during the Festive Period, it looks like this same trait comes to fore with @rauliruegas at this same period as well, along with all the others unashamedly displayed throughout the year.   

@rauliruegas I wish you and all Forum Members in equal measure,  the very best for the Festive Season and hope for a Prosperous 2023 to be met. Period.    

I’ll “step up” 😀 and wish you “happy holidays” as well.