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Thread: Balanced amp / output ?

  1. #11
    Join Date: Mar 2017

    Location: Seaford UK

    Posts: 936
    I'm Dennis.

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    balanced systems were developed by pro audio because they are much more manageable from the S/N point of view, where in pro setups. frequent connecting and disconnecting are the norm, and often with long cable runs. They don't want to faf around with hum problems while a band is waiting to record for example.

    There are true balanced systems and also other variations which approximate to balanced. ATC active speakers for example have balanced I/Ps. As has been said, the circuits have twice the elements in them, and usually about twice the distortion, bt in reality it is probably still insignificant.

    I am happy with balanced pre and speakers, but FM O/P has an unbalanced O/P, and also my CD player, but it is very much more usual to feed a balanced I/P from an unbalanced O/P, than the other way round.

  2. #12
    Join Date: May 2012

    Location: Dagenham Essex

    Posts: 9,064
    I'm I'mteachingmarcotheartofpishanto.

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    Quote Originally Posted by Light Dependant Resistor View Post
    Balanced audio finds use where you have need for long cable runs, it has ability to reject noise and offer wider dynamic range than unbalanced audio.
    However unbalanced can be made to similarly reject noise intrusion where opto coupling is used, and provide just as good, if not better ability for silence,
    in the process improving signal to noise ratio. The NSL32SR3 LDR for instance offers this ability, however requires much care with how it is powered.
    Marco ( The Headmaster ) might provide a review of a unit I sent to him late last year... if we are all good

    Some equipment that benefits from balanced audio includes phono stages, seen in the Audio Synthesis ADEQ product of the 1990's. Also headphones can be
    rewired for balanced audio and some amplifiers are provided with balanced inputs. Traditionally though balanced audio is used in recording studios and for live concerts.
    http://www.aviom.com/blog/balanced-vs-unbalanced/

    Whether balanced sounds better than unbalanced requires comparison using identical equipment. There is far more complexity with balanced audio. IMO the same advantages
    it offers can be attained with unbalanced, as explained above. That said some stages like phono benefit from being arranged with RIAA eq being balanced and turntables wired for balanced
    - which is due to the very small voltages involved. Taking this purist path requires attaining or building a balanced phono stage

    Generally converting unbalanced to balanced can be done with a THAT 1646 http://www.thatcorp.com/1600-series_...iver_ICs.shtml
    noting you need to regulate the current to each polarity of the devices power supply ( LM317/337 )
    Thanks Chris for the detailed reply
    Music , fills the gaps between silence !

    TAT Sale post Leader " Marcos Mentor "

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  3. #13
    Join Date: Nov 2008

    Location: North Down /Northern Ireland/ UK

    Posts: 18,683
    I'm Neil.

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    Subjectively I feel that balanced designs sound better, even when using short cable runs 1m. In saying that there is a positive benefit using long cable runs.

    I doubt the Toshiba 9500 has true balanced outputs, more likely just XLR outputs and it does not have a dual differential circuit. I can't be bothered opening mine up to look.
    Regards Neil

  4. #14
    Join Date: Dec 2018

    Location: Maidstone

    Posts: 40
    I'm julian.

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    In my experience, they both sound very much the same, but i have only used 1 metre runs of cable. If i have the option, at the same price point, i would go the balanced option.
    PS Audio Directstream DAC, modified Dennon DVD player.
    1980's Aloia 6L6 prototype, Definative Audio modded Rogue 88 Magmum 6550. CI Audio passive pre.
    Wilmslow Audio modified Chario Academy Millenium II's, Zingalis, Podium 0.5's, Frankenstein DIY's
    Ripnas etc

  5. #15
    Join Date: Apr 2017

    Location: England

    Posts: 46
    I'm Pete.

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    Hi All

    The Meridian G series amplifiers have both balanced xlr inputs and unbalanced rca inputs. Of possible interest is that when using the unbalanced rca inputs the signal is converted to balanced before the signal gets any amplification.

    I have a G55 - some detail here http://www.meridian-audio.info/show.php?compid=22 - using the rca inputs.
    It sounds much cleaner than the Meridian 205 monoblocks I was using and the 605 monoblocks a friend brought round to compare with the G55.

  6. #16
    Join Date: Jul 2013

    Location: Kingsbury, NW London

    Posts: 1,091
    I'm Clive.

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    Without getting too technical XLR outputs are higher than RCA which in effect will lower the noise floor. Most of us will not readily be able to hear that but you pays your money and takes your choice.
    I use XLR connections in the main as I like the ability to lock cables securely in place. I have in the past experienced RCA cables working loose and hate having to get to the back of kit and giving the cable a wiggle.
    SOURCE:Auralic Aries G1, OPPO UDP-205 BluRay, SkyQ, Technics SL1210M5G/Achromat/MN Bearing/Isonoes with Boots/Origin Live Encounter Mk3A/Hana SL or AT-OC9XSH or AT33PTG/II, PS Audio NuWave Phono Converter
    DAC: Chord Qutest, Chord Mojo/Poly
    AMPLIFIER:Bryston BP17-3 Pre & Bryston 4B3 Power
    SPEAKERS: Spendor D7.
    HEADPHONES OPPO PM-1 with Atlas Zeno cable, B&W C5 v2
    CABLES: Analogue: Speaker - Chord Signature. Interconnect - Atlas Mavros XLR x2, Atlas Mavros Ultra, Chord Indigo Plus XLR.
    Digital: Atlas Mavros Ultra x2, Atlas USB, Chord Optichord.
    Mains: Chord Power Chord x2, Black Rhodium Libra/MK/Shurter or Wattgate x4, IsoTek Orion 6 way, Sounds Fantastic 6way Mains Blocks.
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