There are many topics regarding these types of cables on this forum but no topic comes close enough to answer all my questions
I have 2 Denon dnx3700 cd turntables and a dnx1700 mixer for my studio and I want to link them via the coaxial connection because some people say its better than the old left and right analogue rca???? Since the cd players are digital and the mixer is digital too is it correct you should have digital cables to minimise the amount of digital to analogue converting all the time?
Can I use a standard top quality rca connector?
I have heard it has to be a certain impedance connector?
I have access to some 75ohm quad shielded Belden coax cable wb2006 would that work good enough?
The length of the cable will be 15inches on one cd player and 20inches on the other, will that matter over that length? timing issues?
thanks people😉
I have 2 Denon dnx3700 cd turntables and a dnx1700 mixer for my studio and I want to link them via the coaxial connection because some people say its better than the old left and right analogue rca???? Since the cd players are digital and the mixer is digital too is it correct you should have digital cables to minimise the amount of digital to analogue converting all the time?
Can I use a standard top quality rca connector?
I have heard it has to be a certain impedance connector?
I have access to some 75ohm quad shielded Belden coax cable wb2006 would that work good enough?
The length of the cable will be 15inches on one cd player and 20inches on the other, will that matter over that length? timing issues?
thanks people😉
You would need to feed very high frequencies to achieve any timing effects. So feel free to pick your lenghts.
Brgds
Brgds
thanks man, I know alot about sound quality and producing music from my studio and working with recording artists but I don't realy know alot about the technicial side of things.
O yeh I forgot would silver solder be best or would standerd 60/40 work fine?
O yeh I forgot would silver solder be best or would standerd 60/40 work fine?
Those will probably work just fine gmarch in an digital setup but where is the learning experience or great fun in that?
At 15 or 20 inches, any cable you can find will work great.
Now at 40 feet, it's a different ballgame.
Now at 40 feet, it's a different ballgame.
If you have to use an RCA connector, there is a Canare RCA that is as close to 75ohm as you will get. It needs to be solidly crimped. I would use a 75ohm coax such as Beldon Video Brilliance. You can purchase ready made cables with the above from a US based online vendor called Blue Jeans cable.
The vendor I suggested can do you a cable with a minimum length of 12inches. For practical reasons, I find it better to make all my cables 1m (3.2feet) long so I can interchange them and allow for repositioning.
Cheers
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Hi,
I Googled alot of sites to make your own digital cable,here is some of what I found and what I did.....CD players and other equipment use 75 Ohm cable,the double shielded cables work the best with SOILD copper single wire core,and tin foil with a close braided 100% shield,now here's where it gets tricky,the ends,some say BNC some say RCA,well BNC will conduct those frequencies and RCA will just get you by,I prefer to go straight to board to board no connectors,I don't swap my equipment around ,I have read you loose signal,ect. going through connectors,and did you know the connection is not a 100% touching the insides,that's where the connection loss comes in.
another thing is impedance match,if your using consumer equipment it usually terminated at 75 ohm's, if it commercial it's 110 ohms ,
I have read different lengths do matter,as the reflected back wave needs to be out of sync with the signal,in other words no less than 1 meter seems to be the correct length,
Sp/dif,75 ohm,aes/ebu 110 ohm, all theses can run on the same short cable ,but you must have a way to select from your software what to use,most equipment is sp/dif.
I also found thought listening that the yellow RCA video cable that comes with 2 audio cables works well up against some expensive ones.
These words are my opinions and my findings so take them with a grain of salt, There are many articles on Google and also go to RANE website lots of great info there!
Happy Listening!
NS
I Googled alot of sites to make your own digital cable,here is some of what I found and what I did.....CD players and other equipment use 75 Ohm cable,the double shielded cables work the best with SOILD copper single wire core,and tin foil with a close braided 100% shield,now here's where it gets tricky,the ends,some say BNC some say RCA,well BNC will conduct those frequencies and RCA will just get you by,I prefer to go straight to board to board no connectors,I don't swap my equipment around ,I have read you loose signal,ect. going through connectors,and did you know the connection is not a 100% touching the insides,that's where the connection loss comes in.
another thing is impedance match,if your using consumer equipment it usually terminated at 75 ohm's, if it commercial it's 110 ohms ,
I have read different lengths do matter,as the reflected back wave needs to be out of sync with the signal,in other words no less than 1 meter seems to be the correct length,
Sp/dif,75 ohm,aes/ebu 110 ohm, all theses can run on the same short cable ,but you must have a way to select from your software what to use,most equipment is sp/dif.
I also found thought listening that the yellow RCA video cable that comes with 2 audio cables works well up against some expensive ones.
These words are my opinions and my findings so take them with a grain of salt, There are many articles on Google and also go to RANE website lots of great info there!
Happy Listening!
NS
Shortest length is always optimum, the rest regarding cable lengths and reflections is myth.
Ask yourself what is critical in determining the frequency content of the square wave, as this will have more affect on signal integrity than trying to guess a cable length.
Ask yourself what is critical in determining the frequency content of the square wave, as this will have more affect on signal integrity than trying to guess a cable length.
Hi marce,
You may be very correct here's the but,
Cable length has a ohm value,
and a capacitance value,
those 2 will give it a RF value, and also affect the square wave slew rate,Be it 1 m or 100 m.
so I must ask have you conducted experiments with these aspects?
or are they so negligently imposed, that they really don't influence the signal degrading a square wave and proportionally the clock integrity?
I am not trying to pick a fight here,I am looking for real tests and not theory, Have you tried this and listened?
And did you know that reflections are the method used to find breaks in cables, it can be calculated in feet exactly where the break or problems is.
Cheers!
You may be very correct here's the but,
Cable length has a ohm value,
and a capacitance value,
those 2 will give it a RF value, and also affect the square wave slew rate,Be it 1 m or 100 m.
so I must ask have you conducted experiments with these aspects?
or are they so negligently imposed, that they really don't influence the signal degrading a square wave and proportionally the clock integrity?
I am not trying to pick a fight here,I am looking for real tests and not theory, Have you tried this and listened?
And did you know that reflections are the method used to find breaks in cables, it can be calculated in feet exactly where the break or problems is.
Cheers!
Coax is good to hundreds of megahertz- there's decades of experimental results including your cable TV system. SPDIF is orders of magnitude lower in frequency.
Might as well worry about the effect of cosmic rays.
Might as well worry about the effect of cosmic rays.
If your coax is correctly sourced and terminated, there will be no reflections. That's basically the whole idea with coax as transmission line....
You have missed out inductance (very very important) and conductance
If you have a look at other threads regarding SPDIF transmission you will find simulations I have done regarding the signal transfer. Also as I specialise in getting digital signals round PCBs for very high speed designs, RF etc and use the simulation software on a regular basis to check signal integrity, the answer is YES...
This is one link, it also shows the transmission line model used for the simulation.😉
http://www.diyaudio.com/forums/digi...-wave-spdif-cable-possible-6.html#post3817956
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Surprising as this might seem, for coaxial transmission lines the theory accurately predicts what is found in any well-constructed test. That saves engineers a lot of time and trouble, as they don't have to test every new design (apart from checking for manufacturing or construction errors) - they simply calculate what will happen.noSmoking said:
Did you know that marce spends his working days designing high-speed circuitry for industry, commerce, military etc. so he is very familiar with transmission line techniques?
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