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Old 15th January 2018, 01:07 PM   #13111
Max Headroom is offline Max Headroom  Australia
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There are significant differences, the initial 1.5 seconds room sound is one difference.

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Old 15th January 2018, 01:11 PM   #13112
scott wurcer is offline scott wurcer  United States
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Quote:
Originally Posted by Max Headroom View Post
Attachment 656992

Attachment 656993
There are significant differences, the initial 1.5 seconds room sound is one difference.

Dan.
Easily visible by eye, there possibly is a difference in spectral balance that is perceived as louder. There looks like some clipping too, not a good sign for critical listening.
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Old 15th January 2018, 01:12 PM   #13113
gabdx is offline gabdx  Canada
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Maybe people moved in the room or they placed a sound damper behind the microphone.
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Old 15th January 2018, 01:13 PM   #13114
Max Headroom is offline Max Headroom  Australia
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If you have to ask the question then you cannot understand the answer.
Try to be a teacher, we are all ears.
Quote:
Good cables are inexpensive to buy but very difficult to make (unless by "make" you just mean putting bought connectors on the ends of bought cable). Almost all DIY cables are seriously inferior to sensible bought cables. Bad cables can be very expensive to buy.
So what defines a 'good' cable versus a 'bad' cable, physical durability etc considerations excepted for the purpose of this discussion.

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Old 15th January 2018, 01:18 PM   #13115
Markw4 is offline Markw4  United States
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Dan, both look clipped which would cause some distortion. Also, since the room sound went up in one case, it may be that whoever was doing the sound recording turned up the gain when the "good" cable was switched in. Maybe that was done so the folks watching online could hear a "difference" given the low fidelity of most streaming audio.

Last edited by Markw4; 15th January 2018 at 01:22 PM.
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Old 15th January 2018, 01:20 PM   #13116
Max Headroom is offline Max Headroom  Australia
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Originally Posted by scott wurcer View Post
Easily visible by eye, there possibly is a difference in spectral balance that is perceived as louder. There looks like some clipping too, not a good sign for critical listening.
The clipping is likely the audio AGC pushing too close to the wire.
Agreed, constant gain would be better but the differences are audible as is.
Wav - 01 - Spectrum.png

Wav - 02 - Spectrum.png

Dan.

Last edited by Max Headroom; 15th January 2018 at 01:22 PM.
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Old 15th January 2018, 01:25 PM   #13117
DF96 is offline DF96  England
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Quote:
Originally Posted by Max Headroom
Try to be a teacher, we are all ears.
Find a good undergraduate textbook on quantum mechanics. Read it. I cannot recommend one as my books are from 40 years ago. If necessary, learn the prerequisite mathematics first: linear vector spaces, concept of orthogonality, complex numbers, second-order differential equations etc. Also, it helps if you have a good grasp of classical mechanics, especially in the Lagrangian and/or Hamiltonian form.

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So what defines a 'good' cable versus a 'bad' cable, physical durability etc considerations excepted for the purpose of this discussion.
Adequately low series resistance, and can carry required current without overheating. Adequately high shunt resistance, and can carry required voltage safely. Moderate (not too high, not too low) inductance and capacitance. If unbalanced, then well shielded accurate coaxial construction. If balanced, then adequately tight twist of pair.
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Old 15th January 2018, 01:36 PM   #13118
Max Headroom is offline Max Headroom  Australia
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Old 15th January 2018, 01:38 PM   #13119
gabdx is offline gabdx  Canada
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KK , not want to name the manufacturer, makes possibly the best speaker cables. Can be bought by the spool too. Not too hard to make a replica.

Possibly the type of copper makes a difference: slow/fast drawn, cold drawn, hot drawn etc. at the molecular level.
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Old 15th January 2018, 01:43 PM   #13120
billshurv is online now billshurv  United Kingdom
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Funniest snake oil theories
Thanks Dan, That's really interesting.
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