If adding a coupler does not add capacitance, there is no real impact to the performance?

[GabrielPhoto]

Hi!
I needed a 25foot RCA cable for my subwoofer but I realized I had two Monoprice Onix cables one 15 and one 12' so just 27'. So I used a coupler and measured capacitance (if that even matters) and it was still 21pF per foot so not sure if there is anything else that is a concern when using a coupler?
Thanks

 

[DVDdoug]

No harm.

And capacitance (in parallel like with a cable) is especially unimportant with a subwoofer because if it has any effect it starts to act like a low-pass filter.

 

[AnalogSteph]

A coupler adds two pairs of contract surfaces so might be a cause of issues in that regard, but other than that it won't do much at audio frequencies.

 

[Speedskater]

Total cable capacitance in a line level interconnect system has no impact on analog audio performance.
However in a phono cartridge to pre-amp input cable it can have an impact on high frequency performance.

 

[GabrielPhoto]

The reason I was asking is because I found some comments about losing conductivity due to the coupler..for whatever that matters in my case

 

[sam_adams]

The capacitance of the coupler is significantly lower than the total cable capacitance so that's a non-issue. There might be a small change in the overall total resistance of the cable because of the coupler, but you would be measuring that in milliohms, so again, it's really not going to be of any consequence.

 

[GabrielPhoto]

I am happy to save money then..
Thanks all!!!

 

[MaxwellsEq]

As others have said, it should not be a problem. However, it does increase the number of junctions in series. If you live in a high contamination area (near the sea or near roads etc), it's worth remembering to regularly disconnect and reconnect this junction and other RCA connections.

 

[GabrielPhoto]

BTW, while researching this I stumbled upon this " interesting" article...

Why Subwoofers Should be Connected With an RCA - REL Acoustics

Field Notes are real life experiences we share with you gleaned from the over 2,000 visits to dealers we make each year. We’re in the field a LOT, helping

rel.net

 

[Speedskater]

The person in that video is totally confused about cable construction.
But anyway, a low subwoofer cable with RCA connectors should have a heavy braided shield. Not the cable that the cable TV system uses.

 

[Speedskater]

By the way, RCA refers to a type of signal cable connector, some other signal connectors are: BNC. XLR, DIN, 1/4 inch phono and some smaller connectors.
coax is a type of cable that has one central conductor and a circular shield. There are many different coax cables optimized for different purposes.

 

[SSS]

Of course shielded coaxial cable can be used for audio too. It is often more rigid, but for a permanent installation this should be no problem. And there exist RCA connectors which are able to catch the bigger diameter. There are also audio RCA ready made cables with big diameter. The referenced blog above tells just nonsense.

 

[Speedskater]

Of course shielded coaxial cable can be used for audio too. It is often more rigid

You are thinking of a particular type of coax cable optimized for cable or satellite television.
Almost all nice RCA connector audio interconnects use a coax cable.