Interconnect Lengths

Posted by: staffy on 04 February 2016

I have just ordered a Chord Chorus Reference interconnect at 1 metre in length.  I was told by Chord that an interconnect has to be at least 1 metre in length or the signal  that passes through it is reduced.  That is to say a half metre, which is what I wanted, is basically no good.

Is this true?.      Surely a company like Chord would not say something to the contrary, just to sell 1 cable.

My Flatcap and Nait are only 10" inches apart so I did not really need a 1 metre length.

Posted on: 04 February 2016 by Wiltshireman

Not sure what they would say that as they make half metre lengths themselves or at least did. 

Posted on: 04 February 2016 by George F

I don’t believe it.

Surely the wires that join the pre-amp to the power side in an integrated amp are only an inch or two long!

Also what about something like the DAC V1 where the DAC signal amplified by the pre-amp section is adjacent and hard wired to pre-amplifier part.

No this is marketing nonsense! 

I bet Flashback would make cables of whatever length you asked for.

ATB from George

Posted on: 04 February 2016 by hungryhalibut

What exactly are you planning to connect with this lead?

Posted on: 04 February 2016 by staffy

I will be connecting my FC xs to my Nait xs 2.   Chord say they do not make half metre lengths.

Posted on: 04 February 2016 by james n

Why don't you use the standard Snaic leads - they work well ?

Posted on: 04 February 2016 by staffy

If I had known that I would not have bought the Chord.  Needless to say I will not be buying any more.  I think I will be paying Witchhat a visit for interconnects.  Mine are 16-18 years old and I want to modernise a couple.

Posted on: 04 February 2016 by james n

Ah ok 

Posted on: 04 February 2016 by hungryhalibut

As far as I am aware, the chord lead is an interconnect, for connecting a source to a preamp. As a consequence, it has its five pins in a 180 degree semicircle. The 5 pin Snaic, which is what you want, has its pins in a 240 degree shape. As a consequence the chord lead will not fit. 

We did advise you what to buy in the other thread - i.e. proper Naim snaics, but you seem determined to ignore advice for some reason. 

Posted on: 04 February 2016 by staffy

I have two snaics connecting the FC to the  amp.  The Chord is to allow my rega TT from a stageline into the FC.

To do this I need an interconnect hence the chord.

Posted on: 04 February 2016 by hungryhalibut

I always thought the Stageline needs a 5 pin Snaic and a 4 pin to 5 pin interconnect. Is it the latter that you have ordered from Chord. Sorry, I'm getting confused!

Posted on: 04 February 2016 by Richard Dane

Sounds like you want the Naim 4-5 Interconnect - the ideal solution for taking Stageline signal from the Fclatcap 2 to your NAIT xs.

Posted on: 04 February 2016 by Don Atkinson

Staffy,

Interconnects are more than just the wires, they include the terminations or the connectors at each end.

My understanding is that signals passing along the cables are "reflected" by the terminations at each end. On really short cables, these reflections (and their subsequent re-reflections etc) can cause interference. Longer interconnects suffer less from these reflections and re-reflections. Different terminations cause different amounts of reflections, with the traditional RCA type connections amongst the worst offenders.

This might be the reason that Chord (and others) limit the minimum length of their cables.

Quite separately, it is perfectly acceptable on this forum to seek advice, receive that advice and then subsequently move in a different direction, without having to explain yourself, or appologise for your decisions.

Posted on: 04 February 2016 by staffy

Going back to dealer....he has 45 years in trade and knows people at naim and Chord by names. He was on phone to chord for 10 mins explaining things re the IC.

Posted on: 04 February 2016 by Mike-B
The signal IC - Chord Chorus, Lavender, HiLine - is a 180 degree 5 pin.   It carries left & right channel signals & a common ground ( ch1  ch2  & -ve )  connected to 3 of the pins in the 5 pin plug. 
 
The Flatcap & Nait combination needs TWO cables called SNAIC
They are connected between the Nait's removable "upgrade" link plug & the Flatcap
One connects Flatcap to the Nait pre-amp section & has 240 degree 5 pin plugs,  it carries 2 signal channels & 2x 24v power supplies & a common ground (-ve)
The other connects Flatcap to Nait power amp section & has 240 degree 4 pin plugs,  it carries 2 signal channels & a common ground (-ve) 
 
If you want shorter ones,  have a look on (www) Flashback Sales, they make to length  
Posted on: 04 February 2016 by staffy
Don Atkinson posted:

Staffy,

Interconnects are more than just the wires, they include the terminations or the connectors at each end.

My understanding is that signals passing along the cables are "reflected" by the terminations at each end. On really short cables, these reflections (and their subsequent re-reflections etc) can cause interference. Longer interconnects suffer less from these reflections and re-reflections. Different terminations cause different amounts of reflections, with the traditional RCA type connections amongst the worst offenders.

This might be the reason that Chord (and others) limit the minimum length of their cables.

Quite separately, it is perfectly acceptable on this forum to seek advice, receive that advice and then subsequently move in a different direction, without having to explain yourself, or appologise for your decisions.

Thanks Don...the advice so far has saved me a lot of cash. Will be speaking at length with dealer.

Chord basically reiterated what you have just stayed.  Thanks for confirming.

Posted on: 04 February 2016 by rjstaines

It's definitely to do with signal reflections in the cable...  isn't this what all the array tuning is about, trying to minimise this effect?  I do hope so because I have a £2,000 pair of din to XLR leads on dem at the moment, and I'm not hearing much reflection at all. In fact I'm hearing lots of music, and all this through a NAC202 preamp.  So my advice to Staffy (OP) is to go with the best interconnect you can afford, and that's probably going to be a Chord or a Naim (although others on here will advocate other brands).

Aim for interconnects being around 10% of the amplifier/preamp cost, that would be my stick in the ground   

...but this probably doesn't help you right now, and I'm guessing this would be because you haven't yet had the opportunity to hear what a difference an interconnect actually does make to your music.  Open your mind to the improbable, and maybe even the impossible... they both occur quite often in this game / hobby / pastime / search-for-perfection that most of us are pursuing. 

Posted on: 05 February 2016 by Mike-B
Its my understanding that the "reflection" issues is related to RCA interconnects & that its caused by an impedance mismatch between the RCA plugs & the cable.  The RCA standard was originally designed with its dimensions set for 50ohms, in practice they can be anywhere from 40ohms to 200ohms & unless the cable impedance is close to whatever the plug is, then this becomes a potential problem.  I also understand it most applicable to long cable length rather than short.  
DIN and XLR connectors do not have the problem and they assume approximately the same impedance as the cable.

 

Posted on: 05 February 2016 by Don Atkinson

Mike,

My recollections about "reflections" as set out above are somewhat vague, so I anticipate that your understanding is more accurate.

Just as important (probably more important) is the OP is now getting advice from his retailer/manufacturer and appreciates that he is at liberty to seek initial advice here without (too much) criticism !

Posted on: 05 February 2016 by staffy

Thanks Don.  Proper gent

Posted on: 05 February 2016 by Don Atkinson
staffy posted:

Thanks Don.  Proper gent

no worries (as I think they would say Down Under) !

Posted on: 05 February 2016 by Don Atkinson
Don Atkinson posted:

Mike,

My recollections about "reflections" as set out above are somewhat vague, so I anticipate that your understanding is more accurate. And i'm pretty sure that Staffy and others will also appreciate your guidance. Many thanks.

Just as important (probably more important) is the OP is now getting advice from his retailer/manufacturer and appreciates that he is at liberty to seek initial advice here without (too much) criticism !

Somehow, I failed to copy this part from my initial draft - apologies.

Posted on: 05 February 2016 by Mike-B

Not required Don, it's what the forum is all about.  I'm not too sure about any audible effects of this problem, especially with differences between 1m & 1.2m. I suspect that if he can hear something that he sleeps during the day hanging from rafters by his toes.

It will be nice if Staffy lets us know how it turns out

Posted on: 06 February 2016 by Mike-B
Further fuel on the fire  ...........   a picture of my IC's
The CDX2 is now an NDX  but the IC connects at the same position. 
I've compared with various other IC's & found nothing audibly better. 

Posted on: 06 February 2016 by Huge

Mike, typical engineer, obsessed with neatness to the point of OCD! 
It does look good though.

My understanding is that because the wavelength of the audio signal in the cable is so long, the 'reflections' are irrelevant at these frequencies, and only become significant at RF.  Shorter audio cables won't necessarily sound better or worse, but they may be different as they'll affect the tuning of the RFI rejection of the system.

Posted on: 06 February 2016 by Mike-B
Just so Huge - trade skills training always shows - OCD & proud
Also with absolute minimal C, L & R & an antenna length in 100's MHz,   I'm luxuriating in the fact that my shortest possible cables are adding & taking away next to nothing in audio terms, so in that respect my cables sound like nothing.