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Post by BilliumB on Nov 22, 2020 13:22:32 GMT
Hi Martin
Did you ever get to do any further tests with a 'more expensive' meter?
Cheers. Bill
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Post by MartinT on Nov 22, 2020 13:33:54 GMT
Hi Bill, no, I found that the cheap meter correlated highly with the sound quality I was getting.
Worst case was those dimmable LEDs above our dining table. Terrible noise (over 200mV) and the SQ suffered a little.
Getting the noise in the music room down to 19mV or lower correlated with the best sound I was getting.
Remember, my system already rejects noise pretty well. For most households and systems, noise is going to be a greater problem.
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Post by MikeMusic on Nov 22, 2020 15:53:33 GMT
LEDs ?
Thought they would be ok
Was it the LEDs or the dimmer causing the noise ?
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Post by MartinT on Nov 22, 2020 16:08:06 GMT
LEDs ? Thought they would be ok Was it the LEDs or the dimmer causing the noise ? Both, I think, with the dimmer causing noise at both ends. Here's a good diagram of what a nasty waveform dimmers create...  |
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Post by MikeMusic on Nov 22, 2020 17:00:09 GMT
Ouch
What lighting do you use now ?
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Post by MartinT on Nov 22, 2020 17:45:05 GMT
All-LED in the Music Room but only two uplighters lit when I'm listening.
The rest of the barn is as normal. Ruth knows not to turn on those shitty dimmed lights over the dining table when I'm listening.
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Post by MikeMusic on Nov 22, 2020 18:28:55 GMT
All-LED in the Music Room but only two uplighters lit when I'm listening. The rest of the barn is as normal. Ruth knows not to turn on those shitty dimmed lights over the dining table when I'm listening. Good for me with as few lights as possible Wouldn't a compact fluorescent be noisier ? Like the idea of Ruth sitting in the dark  |
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Post by MartinT on Nov 22, 2020 20:10:04 GMT
Yes, CFLs are worse which is why they're nearly all gone. Just waiting for the few left to die.
There are plenty of LED lights in the main house, she doesn't need the dining table lights!
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Post by MikeMusic on Nov 23, 2020 10:48:19 GMT
Good to hear
I'll be replacing our CFLs with LEDs
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Post by MartinT on Nov 23, 2020 12:26:51 GMT
Switched LEDs good.
Dimmed LEDs bad!
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Post by Slinger on Nov 23, 2020 14:07:23 GMT
I think I mentioned, I've used LED tubes in the kitchen for a while, and they're much better than the old fluorescent tubes. They activate immediately, so there's no " hold on, I'm still thinking about it" pause when switching on, there's no angry buzzing, etc.  You can also get them in cool, daylight, white, etc. |
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Post by MartinT on Nov 23, 2020 14:17:27 GMT
Our garage has tubes so I'll look at the LED ones when they need replacement.
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Post by MikeMusic on Nov 23, 2020 15:55:19 GMT
Switched LEDs good. Dimmed LEDs bad! If I was going to get a dimmer I won't now |
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Post by MikeMusic on Nov 23, 2020 15:57:45 GMT
Our garage has tubes so I'll look at the LED ones when they need replacement. We have some odd, small strip lights in the kitchen May or may not be fluorescent Short life span so hope to get LEDs |
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Post by robin5 on Dec 17, 2020 18:08:07 GMT
I’ve found that Shunyata mains cables (nr versions) to be very effective in removing mains hash.
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Post by MartinT on Dec 17, 2020 19:32:17 GMT
Likewise with Coherent mains cables. However, it's best practice to first remove all sources of noise as much as possible and get that noise floor down.
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Post by MikeMusic on Mar 21, 2021 10:16:21 GMT
Interesting revisiting this thread to usefully remind me of what you found on testing
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arnop
Rank: Soloist
"...Obviously You're not a Golfer..."
Posts: 8 
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Post by arnop on Mar 22, 2021 6:09:39 GMT
I’ve found that Shunyata mains cables (nr versions) to be very effective in removing mains hash. Would be interesting to see measurement values with/without a certain power cable (not fully unplugging and then get a value of "0" that is ;-) ) |
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Post by jandl100 on Mar 22, 2021 7:01:40 GMT
Yes, it's interesting re-reading this thread.
One of the main shortcomings of my Cyrus preamp is a relative lack of soundstage depth.
I wonder if the Cyrus is particularly sensitive to mainsborne noise.
I shall dig out a couple of my usually useless ferrite clamps and listen for any differences.
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Post by MartinT on Mar 22, 2021 7:58:14 GMT
One of the main shortcomings of my Cyrus preamp is a relative lack of soundstage depth. With your speakers, lack of soundstage depth would be hard to achieve. Worth trying a plug-in filter. Unfortunately, only the Kemp and Sercal measured well and they're both hard to get. Use your eBay fu! |
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You can also get them in cool, daylight, white, etc.
