2. amps-preamps
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Balanced vs RCA between amp/preamp

Well I'm taking my first step into separate components with a Marantz SC-11s1 and SM-11s1. Would like to know about the +/-'s of using RCA vs balanced interconnects between the two. All my input sources are single ended.

I understand the Marantz components balanced connections have pin 2 wired cold and pin 3 wired hot. Does this mean I need to reverse the cables going to my speakers (if I decide to use balanced connections between amp/preamp).

I also understand the RCA connections conserve absolute polarity. But is there a performance "hit" taken by using singled ended connections between amp/preamp?

Thank you in advance......
wec56
tweak1
3,666 posts
 
audiorusty

Im envious. I always lusted for A-S kit, but was always out of my budget. Perhaps the closest I got was when I had Accoustats with their OTL amps. Did a few modes to the boards + chips and cryoed NOS tubes. Even if the sound was comparable, the Accoustats were affixed directly behind each speaker, designed exclusively for their panels.

Must be cool just to look at them, such a classic design honoring an important era in communications kit that looked like military hardware 
Post removed 
bhd72
11 posts
 
My home system was dramatically improved by 2 instances of changing to XLR cables: the tube preamp (ARC) to SS amp (McIntosh) connection eliminated noise that was present with unbalanced cables (cables were about 7 feet long) & my Marantz SACD (SA-11S3) to the pre made a huge difference, whether only because the balanced connection was louder (as some attest) or the cable was of far better quality than the previous unbalanced one, I don't know.
ieales's avatar
ieales
1,201 posts
 
Sorry, but posts like the above are just fanboy prattle, equivalent to
      "I changed everything and it sounded different."

Many balanced devices are bodged to accommodate unbalanced operation and coupled with generally incorrect balanced wiring, they don't stand a snowballs chance of optimum operation in unbalanced mode.

If 4+ decades in electronics has taught me anything, it's that if it can be screwed up it will be: 
  • inexperienced engineers
  • incompetent sales staff
  • ignorant consumers

pbnaudio's avatar
pbnaudio
1,613 posts
 
Regarding ground connection being connected first and disconnected last  IS true if one wire the balanced connections as perhaps intended. The shell which has the 4th terminal on a 3 prong XLR connector is intended for Chassis ground.  XLR connectors are available with up to 6 (7) termination points.  

Most however don't use this 4th connection point, including me.  Pin 1 Chassis Ground, Pin2 Positive Node Pin3 Negative node.  So to refer to the OP since your Marantz gear have the same termination on both pre and power amp - your in electrical phase and don't need to do anything else.

As far as balanced operation which in my opinion offer vastly improved performance dynamics for an example and noise rejection and that the interactions of the cable is practically eliminated the list goes on.  All the equipment we make is fully balanced form input to output. Even on our economy line Liberty Audio the gear is fully balanced.

Good Listening

Peter

https://pbnaudio.com

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