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The Centrance HiFi M8 thread

Discussion in 'Portable Source Gear' started by firev1, Aug 15, 2012.
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  1. thomascrown
     
     
    Hi, as you can read, Mr Goodman has already described the advantage of using the balanced ouput on the hifi m8. Now it's matter of trying how is noticeable the difference between the outputs
     
  2. moodyrn
    Apparently you are missing the point and my initial question. I'm not asking if there's any improvement with the technology used. But the difference between the two jacks when Michael also stated that the single ended output used the same balanced impedance topology and was the same as the balanced out.
     
  3. thomascrown
    I see, well I think the advantage it's for those who want to keep using their already modified headphones without swapping cables.
     
  4. jazzman7
    I too have an M8 and really love its sound, especially when driven by the USB B input (hi res).
     
    On balanced outputs, I've gotten balanced cables for two headphones in my stable that I thought would benefit from it (LCD-2, Alpha Dog).  I use those cables with the M8, although I cannot claim to hear a difference in that output vs. the unbalanced 1/4-inch output.
     
    I did come across this thread from almost 9 years ago on balanced amps, which has lots of discussion from Tyll Hertsens (at a time when his post count was low, it seems) and others:
     
    http://www.head-fi.org/t/140716/what-are-the-technical-advantages-of-a-balanced-headphone-amplifier/
     
    I found this post particularly enlightening:
     
    ----------
    Mick Maloney of Supratek
     
    Quote:

    Balanced operation
    I often get asked about the advantages of balanced operation-my reply is based on the following:

    Balanced/unbalanced is a conentious subject. It comes from the pro audio world where they need it to balance out the noise pickup from very long cables.
    True balance involves either using balancing transfomers or turning a Single Ended cicuit (as most preamps are) into a push pull circuit with double the components, circuitry etc- this is the only way to achieve "true" balanced throughout the preamp.
    There's a lot of hype about it, with a lot of so called balanced operation being psuedo balanced, which is basically having an XLR socket wired to accept a balanced signal and turning it back to unbalanced.
    Personally I prefer Single Ended operation every time- there's an ease and effortlesss about it, wheras true balanced sounds more electronic to me, especially the push pull types of operation.
    One area where it is useful is in helping with RF noise in the big cities- it is not an isue for me in my country town isolation, but places like NY benefit from it and in my mind the best way to use balanced is to take it off the output transformer of a preamp, which fortunately we can do with the Supratek pres- it is true and perfect balanced with the minimum of circuitry to degrade the sound.
    ( there's virtually no circuitry!)
    One balancing point in a preamp is all that is necessary- the output transformer turns the single ended circuit into a balanced circuit with two phases and the noise common to both channels (hum, RF etc) is greatly reduced.
    Going for balanced throughout is sonic overkill that does more harm than good IMO- it has been a successful marketing campaign by some companies, but it is marketed to sell amps.
     
    ----------
     
    What this has taught me is the following (all IMO): 
     
    1)  I will never recable a headphone with a permanent cord to make it balanced.  I'll only buy detachable cables for headphones to use them with balanced outputs if desired. 
    2)  I will never seek a balanced connection for a portable headphone -- it simply adds bulk and offers marginal gains for that type of headphone. 
    3)  Balanced amps are a "balancing act" and as such, I will never seek to buy a headphone amp just because it is balanced, "fully" or otherwise.  Of course, if an amp is great because it was designed to work in balanced mode, that is a different story as its designers made that choice.  My ears will be the judge.   
    4)  Head-Fi changes a lot over enough time (I don't recognize any of the amp names, manufacturers, or even posters, except Tyll who has totally changed his job description from back then)
     
  5. headwhacker
     
    My exact same sentiment I enjoyed M8 even before I tried using the balanced output. I have demoed it against a Sony PHA-1 on a unbalanced output and it won me over so I bought it on the spot from a local distributor.
     
    However, I was curious about using the balanced output so I bought a store-modified Beyerdynamic T1 with a detachable balanced cable. No matter what music I use to compare I really can't hear any difference between balanced and unbalanced output on M8.
     
    Before I purchased my T1, I was thinking about buying a balanced cable for my JH16 or go the DIY route. I only dropped the idea when I didn't hear any difference on my T1.
     
    Fortunately for me I didn't spend more on balanced cable for the rest of my in-ears and I still would get the modded T1 for convenience even if I knew M8 only has a balanced output from the start.
     
  6. likes2hike
    Perhaps some of the confusion has come from earlier posts  which stated that the M8 WAS a balanced DAC/AMP
    http://www.head-fi.org/t/622939/the-centrance-hifi-m8-thread/90#post_8737974
    post #96 of 4910
     
    [​IMG]
     
  7. Francisk
    In other words, the only way to truly appreciate the quality of a balanced headphone is through a true balanced headamp which of course will not come in the form of a portable unit
     
  8. mgoodman

    Great find, thanks! If memory serves right, this is about the time (Fall 2012), still during the design phase, when we actually switched from a fully balanced path (yes, we had a version like that in the beginning) to a different circuit topology, with a single-ended, but more powerful amp and an impedance-balanced output. I still have the old PCB somewhere and can show that we did in fact test that fully-balanced version.

    The reason we eventually switched was battery life. We had to make a compromise and give you both high output level AND relatively long-lasting battery. We achieved both with a design technique that was a good choice (and judging by customer satisfaction it still is a good choice today, on the sound quality level, aside from the verbal controversy.)

    The reason I never got into the argument about balanced headphone cables was simple. There is a small army of devotees out there who DO hear the difference. Possibly due to RF protection offered by balanced output. May be they live in a busy metropolitan area with much cell phone interference and M8 filters that out well. Or may be because their recabled headphones offer a better balanced impedance in the send and return wires. We can only guess at the factors now, but people have written in to say that the balanced output worked for them.

    Whether or not there is a huge difference is not my place to decide. I provided the feature without questioning why. If we start questioning the real delta difference between having a feature or not, let's ask if anyone has seriously benefitted from re-purchasing their music collection in full 192-kHz glory. Would it be my place to argue that the benefit there is small? Of course not! Not my business, but the business of the customer to make that call. I deliver the tools, not the taste.

    Having said all of that, a sneak peak to let you know that the upcoming Mini-M8 actually does drive the balanced output with a dual amp. Not as powerfully as HiFi-M8, so we could both use the dual amps AND extend the battery life to 11 hours (Mini-M8 is designed to be used mostly with IEMs, so output power is smaller than HiFi-M8, which will continue to sell and power all big cans). So with Mini-M8 it will be truly possible to hear the difference between a balanced driver and a single-ended one. And yes, the balanced jack will have about 6dB more sound level.
     
    ButtUglyJeff likes this.
  9. pink panther
    Mr. Goodman, this was a very detailed and a very honest statement.
    You did a great job with the M8 concerning versatility, sound quality and battery life.
    Keep on with the development of these fine portable devices.
     
    Regards with respect Martin  
      

     
  10. mgoodman

    Thank you for the kind words!
     
  11. likes2hike
    Thank you for your participation in this forum and your candid responses.
     
  12. pekingduck
    @mgoodman When can we buy the mini m8, and how much would it be?
     
  13. mgoodman

    At the risk of being booted for commercial plugs... We are shooting for late summer availability and same price as the HiFi-M8, $699. Mini-M8 will have 4 inputs (USB, iPhone/iPad/iPod, just like its bigger brother, but will also add optical AND coaxial SPDIF for compatibility with many different DAPs.)

    The plan is that It will also do DSD, which is what we are working on now. Because it has many additional features, it's priced the same. The drawback compared to HiFi-M8 is lower output power, but true balanced. While Mini-M8 is best for IEM use, it will still drive many low impedance headphones with plenty of oomph. As usual, we are striking a tight balance.
     
  14. moodyrn
    So the mini will have a fully balanced amp? 
     
  15. Francisk
    Will the mini M8 be able to drive the balanced Hifiman HE6 or Sennheiser HD800?
     
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