Audio cable question re: 75 ohm

tavogee
tavogee Posts: 91
edited January 2011 in Electronics
This is in regards to connecting the Onkyo receivers rca speaker pre-outs to the Emotiva amplifiers rca inputs. Somewhere I had read that 50 ohm rca audio cables should be used. When I received my 10 foot rca cables from Monoprice, they were 75 ohm rca coaxial cables. Would this cable work as intended for this application? THANKS FAVORITES
LIVING ROOM: Onkyo TX-NR808 Receiver | Emotiva XPA-5 Amplifier | Polk Dsw Pro 660wi Subwoofer | Polk RTi A9 Fronts | Polk CSi A6 Center | Polk FXi A6 Surrounds [5.1 Channel Setup]
Post edited by tavogee on
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  • apphd
    apphd Posts: 1,514
    edited January 2011
    Hope someone else can add more than me, but I have never heard what you have read. It is my understanding that 75 ohm RCAs are the norm, and what is intended in design and manufacture. I do believe that not all 75 ohm cables are truly a perfect 75 ohm, but can vary from make to make but usually with out any consequence. Having good consistant impedence match I think is benificial. Like I said I hope someone with more knowledge than me can help you more.
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  • [Deleted User]
    [Deleted User] Posts: 7,658
    edited January 2011
    Hello,
    A characteristic impedance of a connecting cable is really only a concern when dealing with radio frequencies (RF) as opposed to audio frequencies. Connections between an FM antenna and an FM tuner, or connections between a digital transport and a digital-to-analogue converter would need specific impedance matching. However, connections between a preamp and power amp do not need a specific impedance from the cable. This is referring to what is called the "characteristic impedance" not the total series impedance of the cable, that is different.
    I hope this is helpful.
    Regards, Ken
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