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My cable test enterprise - Page 14

post #196 of 437
3/1/09 at 6:11pm
Quote:
Originally Posted by nick_charles View Post
This text is between a DH labs BL-1 Series II Silver Plated Copper cable and the solid copper Sidewinder with the cymbals sample.

Maximum difference is at 19488hz where the difference is -75.3254db to
-75.3695db i.e a difference of 0.0441db, average difference from 20 to 20K is 0.0014 db.
Well man, your numbers keep saying what I already knew and expected, the differences are so puny they are not audible for human.

I was also wondering where the pink line of the DHL was, but it is obviously on the same place as the blue one. You can see one tiny pink dot close to the -70.000 Hz line.

I also guess numbers speak by themselves, don't they nick? You do not need to comment the results

Keep up the good work.

Additional note: I am sorry the webmaster has not updated yet the article i translated... Starting to get pissed of.
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post #197 of 437
3/1/09 at 6:23pm
Quote:
Originally Posted by nick_charles View Post
No, that is not quite true. With all cables there was a low level but steady undercurrent of noise in the audible range - generally around -96db i.e close to the 16 bit theroretical noise floor, with some spikes (-77 to -84db) at 17K 18K and between 20 and 200hz. It was not audible at normal listening levels but was when you crank the volume up to full which is an insane ear-bleeding level on my amp with my headphones.
I did not answer before because you answered your statement by yourself.
Did you get to determine those spikes why they appeared on those ranges?

I also have another question for you. When you do your tests do you turn off all the possible apparatus that could interfere any signal? -Like cellphones, radios, etc-

I hope you did not try to find out those differences by turning up the volume to those ear-bleeding levels, didn't you?
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post #198 of 437
3/1/09 at 6:31pm
Thread Starter 
Noise pattern fro DH Labs cable - nothing unusual here, low levels of background noise at an average of -95.63db and a few spikes at ~ -86db pretty much the same as the Zu


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post #199 of 437
3/1/09 at 6:33pm
Thread Starter 
Quote:
Originally Posted by upstateguy View Post
Hey Nick

You're doing a great job....

Is the difference in post 194 audible?

USG
I will give it a go and report back.
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post #200 of 437
3/1/09 at 6:49pm
Thread Starter 
Quote:
Originally Posted by Bullseye View Post
Did you get to determine those spikes why they appeared on those ranges?

I also have another question for you. When you do your tests do you turn off all the possible apparatus that could interfere any signal? -Like cellphones, radios, etc-

I hope you did not try to find out those differences by turning up the volume to those ear-bleeding levels, didn't you?
No, though some in the < 200 hz are are most likely mains related, the 17K and 18K spikes I have no idea but each cable has a slightly different pattern of spikes.

No cell phone or radio is on though I sit close to a wireless home phone which is a 5ghz type, I do not know if that is interfering, but at normal listening levels......

It is literally silence plus a little bit of noise so no ear damage even at full volume
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post #201 of 437
3/1/09 at 7:05pm
Thread Starter 
Quote:
Originally Posted by upstateguy View Post
Hey Nick

You're doing a great job....

Is the difference in post 194 audible?

USG
No, well not for me in a FooBar ABX.
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post #202 of 437
3/1/09 at 7:10pm
The thread has been made. The article is finally online.

Go here to read it: http://www.head-fi.org/forums/f133/t...5/#post5475079
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post #203 of 437
3/7/09 at 7:09pm
Thread Starter 

DH Labs Silver Plated Copper vs Monoprice stranded copper

White Noise tests 20 - 20K
-------------------------
Maximum difference at any frequency = -0.00436 db , the Monoprice cable has less attenuation at all frequencies, the average difference = - 0.00266 db.

No graph posted, no point , impossible to see the deviations.
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post #204 of 437
3/7/09 at 8:03pm
This thread has been an interesting read. Thanks for your considerable efforts and personal cash outlay.

I'd be interested to see how MIT cables fare in these tests. I've always felt these were the only cables I could really differentiate from most others. My assumption (quite possibly very wrong) was that whatever was in those potted network boxes was actually altering the signal in some measurable way.

My impression was that MIT cables did sound different from everything else. Not necessarily better, but reliably different. Whether that is actually true (reliably) or not is another issue.
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post #205 of 437
3/8/09 at 12:42am
Thread Starter 
Quote:
Originally Posted by fallsroad View Post
I'd be interested to see how MIT cables fare in these tests. I've always felt these were the only cables I could really differentiate from most others. My assumption (quite possibly very wrong) was that whatever was in those potted network boxes was actually altering the signal in some measurable way.
A Zobel network ?. If so very likely but then the cable actually becomes a circuit so is not directly comparable to other cables.
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post #206 of 437
3/8/09 at 1:09am
Quote:
Originally Posted by nick_charles View Post
A Zobel network ?. If so very likely but then the cable actually becomes a circuit so is not directly comparable to other cables.
I'm honestly not sure what is in the box. I saw one cut apart years ago, but they pot the components inside the network boxes.

I'm curious what the boxes do to the signal, if anything, and what sonic consequences that has. Be interesting to see if they measure differently from the cables you've tested, and if so how, and whether or not those differences are audible in your listening tests.
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post #207 of 437
3/12/09 at 7:46pm
This thread is awesome. Thank you Nick for all your work, two hours to setup. You have more patience than I.
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post #208 of 437
3/12/09 at 7:58pm
Thread Starter 
Quote:
Originally Posted by mbd2884 View Post
This thread is awesome. Thank you Nick for all your work, two hours to setup. You have more patience than I.
You are welcome. Awaiting Silver cable for final tests.
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post #209 of 437
3/14/09 at 2:05pm
Thread Starter 

Silver Cable is here

Watch this space...
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post #210 of 437
3/15/09 at 12:53am
Thread Starter 

Silver vs Copper - noise

For these tests I made a slight change to my protocol I used a 16K FFT analysis which translates to 7K sample points. Since I have all the original wav files I may redo them with a smaller FFT later if it is a bust.

Noise differences ranged from
Freq (Hz)SilverCopperdiff
1418-101.0146-92.8366-8.1781
1421-100.8319-95.2206-5.6112
1416-100.7780-95.2324-5.5456
541-99.8670-96.9008-2.9662
15111-97.3906-95.1398-2.2508
538-99.8972-97.7621-2.1351

to

Freq (Hz)SilverCopperdiff
721-79.8842-95.098515.2143
301-80.4885-95.816915.3284
299-79.8153-95.577015.7617
719-79.4283-95.246215.8179
121-65.8202-82.408316.5881
600-79.7158-96.373216.6574
118-66.7071-83.371416.6642
363-80.7216-98.865118.1435
358-73.5922-99.016525.4243
361-70.9139-98.449627.5356


Silver Average Noise level = -97.8339 db
Copper Average Noise level = -99.5085 db
Average difference = 1.6746 db

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