Vinyl rig 1 - NAS Spacedeck / FR64s / Lab 12 Melto / Denon SUT / Ortofon GM SPU. Vinyl rig 2 Mono Set Up - Lenco GL75 c/w Jelco 750D / AT33 Mono / EAR 834P Modded. Amplifiers - Audio Note Empress Silver / Hattor Passive Pre. Digital - Fanless Mini PC / Lampizator TRP / Linear PSU / Hummingboard Network audio adaptor. Speakers - Horns.pl Mummy's. Cables are Audio Note / Albedo / Furutech Speaker wire. Power conditioner is a Gigawatt PC2 EVO
Test 6, and 7 didnt surprise me Alan, that is what I would expect from most things with a clock, good on you for doing the test though, hopefuly it will give folk interested in this thread a bit more insight.
I remember reading somewhere years ago that; if all of a sudden all radio frequencies became visible, there would be so many, that we wouldnt be able to see!
"Today scientists have substituted mathematics for experiments, and they wander off through equation after equation, and eventually build a structure which has no relation to reality"
Nikola Tesla
Its now a conspiracy theory to believe that the Immune system is capable of doing the job it was designed to do.
A fish is only as healthy as the water its swimming in ! [Dr Robert Young]
www.tubedistinctions.co.uk
Matthew 5:10
Yes I did think after seeing all those harmonics that the clock must be on the good side> You don't get a spectrum like that without fast edges.
I had Tony around this afternoon and we did some more testing with a box and cables in various connection arrangements.
Unfortunately we drew a blank with being able to see anything happening, on the spectrum analyser or a 200MHz scope
Steve.
My System:- dCS Vivaldi Transport + dCS Vivaldi Apex DAC + dCS Vivaldi Master Word Clock + dCS Vivaldi Upsampler Plus, Aurender N20 Music Server/Streamer, TW Raven One tt/Graham Phantom II/Transfiguration Orpheus L & Audio Technica ART20 mc's, Whest Titan Pro, D'Agostino Momentum HD pre/S250 MxV power amp, TAD CR-1 MKII loudspeakers, REL Gibraltar G2 subs, Coherent Systems BD Mains, interconnects & speaker cables, Sablon Audo EVO USB cable, Tellurium Q Ultra Silver power cords, Ziro Disclosure & Vertex Roraima Hi-Rez power cords + Furutech FI connectors, Stillpoints ESS racks/component stands, Vertex Aletheia PSU2 balanced power supply, Coherent Systems RTZ3 ground box + CR/BD cables, Acoustica Applicata DaaD room treatment, Mutec Ref10 SE-120.
Are your scopes able to focus/magnify in on the audio band and surrounding area? Say from 5hz to 30khz?
Current: [P20] Roon/Tidal > Custom PC> Chevron Paradox NDF16 > Phast Pre > Neuro. 686 > Tannoy Berkley (RFC tweaks)
Yes I have had a very good improvement to the sound quality, I bought the box and leads a few days ago. Whoopee
The scope was used to view the eye pattern coming from the CD transport, the spectrum analyser can't focus in that low in frequency.
I wonder if it is possible to measure THD+N using something as simple as a calibrated mic and software such as REW?
Current: [P20] Roon/Tidal > Custom PC> Chevron Paradox NDF16 > Phast Pre > Neuro. 686 > Tannoy Berkley (RFC tweaks)
Great afternoon at Alan's lots of scratching of heads swapping of test probes cabilbration and more head scratching but more importantly music after brainstorming
Even was accused of having a quantum slingulaity finger
However the bottom line was predictable which is why Alan is still listening to music I suspect even the vinyl sounded pretty good
Long day 350 miles but Alan is a very genial host also good to bounce a few ideas off
Alan already has his own RTZ box so I am sure there will be more to follow from the man himself at some point in the future
Last edited by Mr. C; 07-02-2019 at 23:08.
Coherent Systems
Real high end sound with musicality not hifi
I put my RF hat on last night and had a think about how the grounding box cables are made.
The construction will effectively create a balun that can reflect an impedance connected to the end of the cable.
The length of the cable (balun) will determine where impedance nulls and peaks will occur across the frequency range. This is the theory so the test is to find out if the grounding box actually has an impedance.
This impedance is relative to free space (RF/antenna engineers will understand this). The impedance of free space is 377 ohms, though this could be thought of as a construct as it is calculated from the theoretical capacitance and inductance of free space, or a vacuum if you will.
What is really needed is a Network Analyser to measure the reflected impedance but I don't have one.
The next best thing is to use the calibration signal of the Spectrum Analyser which is a 50MHz square wave, so displays frequencies at 50MHz intervals across the screen.
I quickly made an adaptor so the grounding box cable could be connected directly to the Spectrum Analyser.
The spectrum was monitored with and without just the lead connected, no difference was found. When the grounding box was connected to the other end of the cable a difference was observed, but only to the bottom 4 frequencies, namely 50/100/150 and 200MHz.
The differences were small but repeatable so the Analyser was set to display to 200MHz and at its maximum vertical resolution of 3dB per graticule line.
Display with/without just the cable connected:
Note the respective levels of the four spikes.
Display with cable and grounding box connected:
Note the 50 and 150MHz responses have increased and the 100 and 200MHz responses have decreased.
OK what does this tell us? It doesn't tell us what the impedance is as that is beyond the scope of the test.
It does confirm that the grounding box has an impedance at RF.
Last edited by Firebottle; 08-02-2019 at 14:06.