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"This Harbeth User Group (HUG) is the Manufacturer's own managed forum dedicated to natural sound, realisable by controlling the confounding variables between tthe microphone and the listeners' ears.

For example, the design of and interaction between the hifi amplifier and its speaker load can and potentially will alter the sound balance of what you hear. To reproduce the sounds captured by the recording microphones, as Harbeth speakers are designed to do, you would naturally select system components (sources, electronics, cables and so on) that do not color the sound before it reaches the speakers.

Identifying components for their system neutrality should, logically, start with the interpretation and analysis of their technical, objective performance, as any and every deviation from a measurably flat frequency response at any point along the serial chain from microphone to ear is very likely to cause the total system to have an audible sonic personality. That includes the contribution of the listening room itself.

HUG specialises in making complex technical matters simple to understand, aiding the identification of audio components likely to maintain a faithful relationship between the recorded sound and the sound you hear. With our heritage of natural sound, HUG cannot be really be expected to guide in the selection, approval, endorsement or even discussion of equipment that is intend to introduce a significantly personalised sound to the audio signal chain. For that you should do your own research and above all, make the effort to visit an Authorised Dealer and listen to your music at your loudness on your loudspeakers through the various electronics offered there. There is no on-line substitute for that time investment in a dealer's showroom.

If you desire to intentionally tune your system sound to your personal taste, please consider carefully how much you should rely upon the subjective opinions of strangers. Their hearing acuity and taste will be different to yours, as will be their motives and budget, their listening distance, listening loudness and listening room treatment, not necessarily leading to appropriate equipment selection and listening satisfaction for you.

Alternatively, if faithfully reproducing the sound intended by the composer, score, conductor and musicians over your speakers is your audio dream, then understanding something of the issues likely to fulfill that objective is what this forum has been helping with since 2006. Welcome!"


Jan. 2018
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Active Crossover for M30

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  • Active Crossover for M30

    Hello,
    I?m interested in a active crossover for my pair of M30. Do you think this is a good idea and is it available?

    many thanks,
    betuned

  • #2
    Re: Active Crossover for M30

    As a matter of interest how would you commence the design and what test equipment would you be using?

    It is absolutely impossible to make a successful active crossover for a passive speaker unless you have an intimate knowledge of the entire speaker's drive units, dimensions and current crossover network. I've covered that here.
    Alan A. Shaw
    Designer, owner
    Harbeth Audio UK

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    • #3
      Re: Active Crossover for M30

      Dear Alan,

      thanks for your quick reply!
      A friend of mine (who knows a lot more about electronics than me) has recently activated a pair of ATC SCM 50. He?s a recording engineer and has ordered active crossovers from ATC which was possible. The result is stunning. So I thought it?s a good idea to activate my M30 too (with the help of my friend). I?ve read in your prospect for Pro-User there?s an active version of the M30. So you?ve already developed an active crossover for the speaker. Is it possible to order this seperately and use it to activate my M30?

      thanks,
      betunded

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      • #4
        Re: Active Crossover for M30

        I regret that I can't offer you an active version. If your friend was supplied with active filters from the factory then, of course, he should be able to activate his passive speakers. But as we can't supply the active electronics then you would need to start the project from the very beginning - and that means months of work.
        Alan A. Shaw
        Designer, owner
        Harbeth Audio UK

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        • #5
          Re: Active Crossover for M30

          Dear Alan,

          what a pity! Perhaps you can offer it sometimes in the future. There must be a reasen why so many pro?s use activated speakers. In my experience there?s much more control.

          many greetings,
          betuned

          Comment


          • #6
            Re: Active Crossover for M30

            Being an ATC owner (of 100A's once and currently 20ASL Pro's), I'd say that "activating" the 50's is the best thing that could have been done with them!

            It's not for me to go into any real detail of another company's products here, but I think I can say that there is a definite need for exact driver matching in three way ATC's that use their dome mid driver, especially in the phase matching at the crossover point between bass and mid unit (easy to set if you know what you're doing and have the proper test equipment to do it). The active amp packs allow this, as well as the usual fine level adjustments normally seen. Remember too that the amps are specifically designed for the 16 Ohm driver load too.

            For years, I thought that "active" was automatically better, the losses in a passive crossover being far greater than any well designed active circuit, but having recently inherited some old Spendor BC2's (with later bass units) and having owned BC1's, Yamaha NS1000's and Harbeth HL5's in the past, I'd confirm today that a well designed passive speaker where all the design parameters have been carefully mixed together doesn't lose anything that a well specified driving amp can't cure to be honest (in my opinion, some other active speaker manufacturers seem to cripple their passive crossovers to make active a necessary upgrade, making the active option part of their costly upgrade path. Not many have the ability to do it properly as a matter of course [Meridian/ATC/Harbeth M40's?]).

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