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Author Topic: The All Purpose Advice Thread  (Read 139949 times)

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Priidik

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Re: The All Purpose Advice Thread
« Reply #760 on: November 22, 2014, 01:19:29 PM »
Chemistry is somewhat toxic to all inhabitants.

Freese, heat or expose to  x-rays.

Micro-waves should penetrate glass fibers as well.
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Priidik

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Re: The All Purpose Advice Thread
« Reply #761 on: November 22, 2014, 01:37:26 PM »
Being lazy again, so i'll just ask some power cable questions here.
I went through some cable threads in HF and din't get much coherent info there.   So many are swearing they hear differences in all major fronts in sound quality. So its hard to stay totaly ignorant at this point.  :)p3

I made a dedicated power line (with dedicated ground) to audio equipment, but so far i haven't heard improvements, sounds the same to me. Though the power cords are all cheap ass chinese shitt. So maybe there is something there i am missing. I have no tools to measure power quality just jet, so the task is on ears.
What should i look for in a power cable to dac or amp? What is there technically?
« Last Edit: November 22, 2014, 02:12:42 PM by Priidik »
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manatworks

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Re: The All Purpose Advice Thread
« Reply #762 on: November 22, 2014, 02:30:40 PM »
Alright guys, just broke down and ordered a pair of UERM today.
Do i even need to upgrade the cable of this one? Or the stock is the best config already?
I know this sounds really weird but most of my friend in hifi meeting group here keep telling me that i might need to upgrade them.
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thegunner100

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Re: The All Purpose Advice Thread
« Reply #763 on: November 22, 2014, 03:08:33 PM »
The stock cable is great in terms of ergonomics and durability. I haven't tried other CIEM cables, so I don't know if they'll make a sonic difference or not. Just stick with the stock cable and save your money imo.
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Solderdude

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Re: The All Purpose Advice Thread
« Reply #764 on: November 22, 2014, 03:09:20 PM »
Quote from: Priidik on November 22, 2014, 01:37:26 PM

What should i look for in a power cable to dac or amp? What is there technically?

Decent and mechanically well fitting connectors are essential, don't need to cost that much either, not too long, not too short, no need for screening (everything behind the wall socket isn't screened). Cable thickness: the thinnest is enough for low power devices, power amps can do with somewhat thicker copper wires.

Of course others (fanboys and cable sellers) may have other opinions.

A mains cord ONLY carries short (a few milli seconds wide) 'pulses' in a 100Hz or 120Hz tempo.
Upper harmonics of those pulses, that have some power behind it, may end up in the few kHz region.
The mains-trafo's FR range limits that peak speed and as most power transformers do not go much further than a few to 10kHz the 'speed' of mains systems is always rediculesly slow.
Harmonics well above 50kHz will usually be common mode and have no problems passing any cable except when ferrites are mounted or mains filters are applied.

There is NO AUDIO passing through any power cord.
Safety ground doesn't do anything againt RFI EMC, it only works as 'safety' ground (so you won't get a shock when touching metal parts)
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Use your ears to enjoy music, not as an analyser.

firev1

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Re: The All Purpose Advice Thread
« Reply #765 on: November 22, 2014, 04:12:27 PM »
Quote from: Priidik on November 22, 2014, 01:19:29 PM
Micro-waves should penetrate glass fibers as well.

I could try disassembling a cheap microwave and fire it at the rockwool I guess, or else its air dry after some spraying I guess?
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Priidik

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Re: The All Purpose Advice Thread
« Reply #766 on: November 22, 2014, 05:30:08 PM »
Quote from: Solderdude on November 22, 2014, 03:09:20 PM

There is NO AUDIO passing through any power cord.
Safety ground doesn't do anything againt RFI EMC, it only works as 'safety' ground (so you won't get a shock when touching metal parts)

Thanks for the insight. Though 'hum' can come through (sure, it could be flawed psu and etc), and i wonder if its characteristics are manipulated by the conductor before a transformer. And then show up as a function of ripple on the dc side, that could affect amplified signal. (Perhaps i should educate myself a bit more in this subject, before waisting other people's time.)

I installed separate ground because of my household appliances and computer crap out all sort of pulses to the ground, so its ~5V average differnece between the separate ground, yea the household ground is just poor.

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Priidik

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Re: The All Purpose Advice Thread
« Reply #767 on: November 22, 2014, 05:42:19 PM »
Quote from: firev1 on November 22, 2014, 04:12:27 PM
I could try disassembling a cheap microwave and fire it at the rockwool I guess, or else its air dry after some spraying I guess?
If you are going for it then try on a small spot first, if it does absorb the waves, then the fibers will stick together, agglomerate.

Back when i built sound absorbers to my room, i sealed the wool panels in a plastic film and then covered with cloth to prevent fibers spreading out. The creatures inside would probably starv there.

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Azteca X

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Re: The All Purpose Advice Thread
« Reply #768 on: November 23, 2014, 02:48:52 AM »
General consensus regarding SPDIF is coax is better than Toslink, right?
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firev1

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Re: The All Purpose Advice Thread
« Reply #769 on: November 23, 2014, 04:21:29 AM »
Quote from: Priidik on November 22, 2014, 05:42:19 PM
If you are going for it then try on a small spot first, if it does absorb the waves, then the fibers will stick together, agglomerate.

Back when i built sound absorbers to my room, i sealed the wool panels in a plastic film and then covered with cloth to prevent fibers spreading out. The creatures inside would probably starv there.



Its okay to shrink wrap them in thin plastic? That would pretty much solve everything :3

@Azteca, ask me and I would say it depends but generally coax has better bandwidth.
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Time spent on enjoyment is not time wasted. - someone
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