Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Oct 8, 2018 5:07:05 GMT
How do you guys measure SPL?
I previously used my phone, until one day I went to someone’s house that had a professional solution - my phone picked up sound 20db louder than it!
One mans 99db could very well be another’s 90db.
|
|
|
|
Post by MartinT on Oct 8, 2018 5:22:52 GMT
I use a Tandy (Radio Shack) digital SPL meter. In fact, I have two! Always set to C-weighted. /about/radio-shack-sound-meter-xxx-57e1c42a3df78c9cce340e81.jpg) |
|
|
|
Post by MikeMusic on Oct 8, 2018 9:08:14 GMT
The exact model I was using.
If looking 2nd hand go for digital display. There are is also an analogue version which I would not buy
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Oct 8, 2018 20:23:45 GMT
I am now satisfied your conversation is accurate  Carry on! |
|
|
|
Post by MartinT on Oct 8, 2018 20:51:24 GMT
Can we get back on topic now? Has anyone else any experience of any grounding box?
|
|
|
|
Post by Stratmangler on Oct 9, 2018 10:39:46 GMT
I don't have a grounding box, but I have referenced my signal ground to the mains earth.
The power for my audio equipment is a "clean" feed back to the consumer unit (as clean as anything off a single consumer unit can be), and all of my audio equipment is class 2 compliant, so no protective earth requirements.
The phono preamp is quieter as a result, and that always benefits vinyl playback sound quality (in fact it's the grounding point on the phono preamp where the mains ground is connected).
The knock on is that the mains (and therefore CMET) connected signal ground is present on all of the equipment in my system, and it makes the digital stuff sound better too.
|
|
|
|
Post by MartinT on Oct 9, 2018 11:17:41 GMT
I was using the reference earth connection in my ifi Purifier to the DAC before setting up the SGS.
I need to play some more with the SGS. I'm going to go back to using it only with the DAC so that I can make some more direct comparisons. I hear next to no difference when clipping to the Pi so I'll take that out of the equation for the moment.
|
|
|
|
Post by MartinT on Oct 10, 2018 18:42:51 GMT
The experimentation continues. I've disconnected the grounding box to the Pi as I couldn't hear any difference. I reconnected my ifi Purifier ground cable to the SEG and left the SGS connected, too. I've now put the second SGS cable on my preamp's power supply. This sounds promising so I'll do some more listening.
|
|
|
|
Post by The Brookmeister on Oct 10, 2018 20:33:57 GMT
|
|
|
|
Post by jandl100 on Oct 11, 2018 7:18:27 GMT
The SGS blurb suggests connecting the grounding box to the neg posts on speakers.
Have you tried that?
|
|
|
|
Post by DaveC on Oct 11, 2018 7:39:09 GMT
The SGS blurb suggests connecting the grounding box to the neg posts on speakers. Have you tried that? A balanced or bridged amplifier will cause all sorts of problems. A Class D is likely to re-inject switching hash into the system. And some systems might go ultrasonically unstable destroying tweeters.
Although I struggle to see how these work generally, but I have heard good reports of the CAD units.
Dave
|
|
|
|
Post by MartinT on Oct 11, 2018 7:42:11 GMT
No, and the SGS cables are not long enough.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Oct 11, 2018 8:27:23 GMT
The SGS blurb suggests connecting the grounding box to the neg posts on speakers. Have you tried that? A balanced or bridged amplifier will cause all sorts of problems. A Class D is likely to re-inject switching hash into the system. And some systems might go ultrasonically unstable destroying tweeters.
In agreement on this one Dave not in favor of amplifier connections at all, have seen a few 'interesting results' when people have tried this! Scott's units are not bad the GC-1, compares very well with Entreq units upto the silver Tellus. More than happy to perform a comparison with the one Mike uses no problem at all. |
|
|
|
Post by Stratmangler on Oct 11, 2018 8:45:48 GMT
The black stuff looks like shot blasting grit.
|
|
Deleted
Deleted Member
Posts: 0
|
Post by Deleted on Oct 11, 2018 9:15:16 GMT
The black stuff looks like shot blasting grit.
Hi Chris This is what is affection-ally know as Vampire poo in the trade  Think along the lines of Shunyata's Fesi balls You will be pleased to know none of our RTZ boxes are constructed anything like that! I noticed this morning they have a new uber Olympic version for £6600 (no cables lol) and it weighs 46Kg, a lot of Vampire poo in that box! Our 20 outlet version weighs about 14Kg but size is 20cm x 8cm x 30cm and is a solid alloy casework. I took apart one of the smaller boxes a few years ago humm. must cost them not a great deal to fabricate them imho |
|
zacke
Rank: Soloist
Posts: 11
|
Post by zacke on Oct 11, 2018 9:17:02 GMT
My first posting here.
Yesterday I ordered a SGS 1 with a variety of cables. I have had my eyes on Entreq for a while and also CAD. But it’s to much money for me to spend. So I’m hoping that one or more SGS 1 will have similar effect on my system.
It seems like the only way to go is to do a lot of testing. Sadly I’m not a person who like to test an do a lot of comparisons. But something tells me that signal grounding is one important step in the chain to clean the digital signal.
Now it’s about 10 days of waiting for the stuff to be delivered.
|
|
|
|
Post by MartinT on Oct 11, 2018 11:37:25 GMT
The Entreq build quality looks poor which is one reason why I didn't buy a used one, preferring to go with a new SGS.
|
|
|
|
Post by MartinT on Oct 11, 2018 11:44:09 GMT
It seems like the only way to go is to do a lot of testing. Sadly I’m not a person who like to test an do a lot of comparisons. But something tells me that signal grounding is one important step in the chain to clean the digital signal. Exactly. I read up on grounding boxes and there is no consensus on generic advice for using them. I have been experimenting and am on about the fifth set of connections. Now I'm listening more which seems to indicate I've found a sweet spot. It may be different for different grounding boxes! Please do add your findings when you receive your SGS, Zacke. I will be very interested. |
|
|
|
Post by julesd68 on Oct 11, 2018 12:01:09 GMT
Could this work with a phono stage or are we just talking digital signals?
|
|
|
|
Post by Stratmangler on Oct 11, 2018 12:30:51 GMT
Could this work with a phono stage or are we just talking digital signals? What's the phono stage? If it's valve based I'd expect it to already have some kind of ground reference.
|
|
Carry on!
