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Old 24th September 2019, 09:36 AM   #21
AKSA is offline AKSA  Australia
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Hi Maty,

Thanks for the post - you make complete sense to me, avoiding transformers is terrific advice...... and I always try to twist all AC cables to keep fields small. Depth is an interesting one but I have noted that, at least with power amps, it is related to minimising global feedback. This tells me it is a phase issue, perhaps 'time-smearing'?

Thank you finding the earth connection, Rom! Are you in Sarajevo?

Peter,

I will despatch your new SAKSA next week, I'm a bit short on energy this week!

Cheers,

Hugh
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Old 24th September 2019, 09:47 AM   #22
maty tinman is offline maty tinman  Spain
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Weeks ago I used the 64-bit PEQ (minimum phase, like analog) of JRiver MC to modify the frequency response of my modified KEF Q100 speakers very slightly, before making the decision to change the filter for another one proposed by Zvu.

Minimum Phase vs Linear Phase | Page 7 | Audio Science Review (ASR) Forum

[IMG, link] https://www.audiosciencereview.com/f...zvu-png.32991/

[IMG, link] https://www.audiosciencereview.com/f...100-png.32987/

Already put, from the PEQ you can add delays. In principle, the human ear / brain appreciates them after 5 ms (factor to be taken into account in the design of the hearing aid). I tried with 50 ms and I went down to 5 ms, where I stayed.

In principle it is used to adjust the speakers that are not the same distance from the listener, but when doing tests I found that improvement.

Sound: 340 m/s. Then 5 ms -> 1.7 m.

These modifications using 64-bit software must be not very aggressive so as not to lose more than win.


The other improvement, analog sound, was unexpected: Foobar or JRiver | Page 8 | Audio Science Review (ASR) Forum
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Last edited by maty tinman; 24th September 2019 at 09:53 AM.
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Old 24th September 2019, 11:12 AM   #23
pan53 is offline pan53  Austria
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Hugh,
thanks that is really good news! Hopefully Austrian customs will work quicker this time!


Maty,
you really are an expert! Adjusting time delay to optimize speakers! Thats far beyond my level of education....


Fortunately this (time-delay) is a problem I don't have. My Mangers are broadband, they play from180Hz to 30.000Hz. And at the low end phase differences because of different driver distances to the listener do not seem to be much of an issue...
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Old 24th September 2019, 01:52 PM   #24
pan53 is offline pan53  Austria
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Hugh, no need to answer - found it myself:

"The electrical conductivity of 6-nines copper and 4-nines copper (99.99% pure) is nearly the same at ambient temperature, although the higher-purity copper has a higher conductivity at cryogenic temperatures. Therefore, for non-cryogenic temperatures, 4-nines copper will probably remain the dominant material for most commercial wire applications. (Wikipedia)


and (on layers of strands):

Basics of Wire and Cable: Solid vs. Stranded Conductors | OmniCable



@ Hugh:
Quote:
I try to use six nines with multiple layers of copper wires, rated to eight amps, suitable for speaker and power supply wires.
One question remaining due to the naming of wire in different countries/languages: What is this: "six nines with multiple layers of copper wires" ?
[Can I look up (on the internet) a picture or a classification table of wire in the english speaking countries? ] Sorry for bothering you with a question the answer of which most of you will know...

Last edited by pan53; 24th September 2019 at 02:18 PM.
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Old 24th September 2019, 11:57 PM   #25
AKSA is offline AKSA  Australia
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Hi Peter,

six nines is 99.9999% and can be bought in 8A wires, with many strands, extremely thin filaments. Very easy to solder, too.

Any good quality wire, I use automotive wire when I can. I will try to find a graphic on the net for this wire!

Cheers,

Hugh
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Old 28th September 2019, 07:30 PM   #26
pan53 is offline pan53  Austria
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Default second transformer arrived so I had to put it in...

Today the second transformer arrived and round 5mm LEDs so I could not resist putting them into the case right away. I turned both transformers upside down so as to get the transformer cables down to the grid plate and a bit out of the way. I also put the common ground screw on the underside of the the grid to get it out of sight too. Then I exchanged the rectangular LEDs I had fixed with tape to the front plate to the newly arrived round ones. (Looks much nicer if only on the inside...)

Twisted the transformer cables and bent them away from the signal leads as far as possible (ca. 1 1/4 inch).

The black input signal cable was too short to get it further away from the transformers.

Please Hugh, when dispatching the 2nd Saksa, please add 120 cm of the input cable, I could not find a decent one here in Austria.

I hear a faint hum at around a foot from the speakers, therefore I have to get longer cables and reroute them, probably between Printed Circuit Board and heatsink, where I hid the LED-cables for now.

Currently the amp weighs 13,7 kg (30 lb) (completed it will be around 15 kg (33 lb)

When I first put the module into the case I had it oriented so the heatsink was in the middle, between transformers and the PCB. I did not like that as I could not easily get to the connections on the PCB so I turned it around. Did not make a sound check to see if the little hum was less that way.
If anyone has experience on that any help is appreciated.


Yesterday I had a disturbing listening session. Since ages I listened to Peter Paul & Mary's Greatest Hits again and was shocked about the scratchy, really distorted voices, especially of Mary. As the instruments were fine I suspected the SAKSA first. Only when listening to other known music I realised that it was obviously the recording. What a shame, I really like the music of P,P&M.
Which proves your point, Hugh, that most of the recordings leave something to be desired....
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Old 28th September 2019, 07:59 PM   #27
maty tinman is offline maty tinman  Spain
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Quote:
Originally Posted by pan53 View Post
Yesterday I had a disturbing listening session. Since ages I listened to Peter Paul & Mary's Greatest Hits again and was shocked about the scratchy, really distorted voices, especially of Mary. As the instruments were fine I suspected the SAKSA first. Only when listening to other known music I realised that it was obviously the recording. What a shame, I really like the music of P,P&M...
Peter Paul And Mary - The Very Best Of Peter Paul And Mary (1975), CD, Warner, Europe

Now Playing + What are you listening to?

The others albums I have are in vinyl. The famous Peter, Paul and Mary - Peter, Paul and Mary (1962) By Warner 2013 Re, 45 rpm has only DR11 too.
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Last edited by maty tinman; 28th September 2019 at 08:04 PM.
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Old 28th September 2019, 09:23 PM   #28
pan53 is offline pan53  Austria
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Thanks Maty!
Found this comment on your link:

man_reik_vinilo
29. November 2018
bezogen auf Peter, Paul And Mary, CD, Album, RE, 1449-2
"Mary's vocals sound distorted/clipping in "500 Miles"? I wonder if it's just this release or was it recorded this way... "


So its not my old ears......

Right now Norwegian singer Kari Bremnes is making glorious music (Svarta Bjoern from 1998) WITHOUT any distortion. :-))) Practically all of her discs are first rate and marvelously recorded. But you probably will know that.

Last edited by pan53; 28th September 2019 at 09:50 PM.
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Old 8th October 2019, 09:37 PM   #29
pan53 is offline pan53  Austria
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Default To provide some reading stuff and prepare the home for my next SAKSA….

Thanks to Maty tinman I had a look at the Starquad cable. I must admit that I mostly use the ordinary black power cables. Not being willing to spend a lot of money again I built two power cords myself.
One 60 cm for the SAKSA and one 3.5m for the connection from the wall outlet to the Dynacord X4100 line filter.
I ordered
Viborg power plugs:
4-strand cable: 4 x 1,5 mm² made in Germany, but no 6 nines copper, no fairy dust.
ground cable (1,5 mm²)
expandable braided sleeving
shrink wrap

And according to the photo tutorial at
Belden 83754 Star-Quad Powercord -
I built the 2 cables.
Look nice, give peace of mind.
Audible difference?
Nothing I can reliably report. But then, I did not take the time to compare old and new….
Maybe I DO need some fairy dust ….

Last edited by pan53; 8th October 2019 at 09:40 PM.
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Old 9th October 2019, 08:00 PM   #30
maty tinman is offline maty tinman  Spain
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Quote:
Originally Posted by pan53 View Post
One 60 cm for the SAKSA and one 3.5m for the connection from the wall outlet to the Dynacord X4100 line filter.
Must be Dynavox X4100, you should drink less Schnaps and Jägermeister

DYNAVOX X4100 HiFi Filter 8 Schuko Black - Audiophonics

DYNAVOX X4100 - SIŤOVY FILTR - Siťovy rozbočovač s vestavěnym VF filtrem - www.hifionline.cz

Inside:

[IMG, link] https://www.hifionline.cz/photos/ori...ltr-inside.jpg
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Last edited by maty tinman; 9th October 2019 at 08:07 PM.
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