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Feb. 2018
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Harbeth Monitor 40.1 specific

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  • #31
    M40.1 - when available in Hong Kong

    Could you please give an idea of when M40.1 will be available in HK?

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    • #32
      Re: M40.1 - when available in Hong Kong

      I was in Hong Kong a few days ago and discussing the delivery situation. We have a substantial back-order from Hong Kong. We are duplicating the PCBs now. Unfortunately, our production manager broke his arm just before I left the UK and it has not healed. As I write, he is in hospital having a metal plate fitted across the break. He is key to us starting production.

      It is our intention that we make the first few pairs next week and that includes some stock for Hong Kong.
      Alan A. Shaw
      Designer, owner
      Harbeth Audio UK

      Comment


      • #33
        Re: M40.1 - active version?

        Active M40.1. Situation is this:

        A very gifted sound engineer (with a large broadcast organisation) has, at his own initiative and with just basic data from me, found a way to program a multi-channel off-the-shelf digital filter box to precisely clone the crossover of the passive M40.1. This dramatically cuts the development time of a marketable active M40.1 solution, just requiring the programed filter box plus six channels of amplification (bass, mid, tweeter x 2).

        We discussed today making time between Christmas and my trip to CES2008 to get together and verify that the DSP works as we expect and to measure and listen to this low-cost active solution v. passive. If it does sound OK, then we will endorse his solution. Whether he is willing to make it available to all customers I can't say, but we are treating this project very seriously indeed.
        Alan A. Shaw
        Designer, owner
        Harbeth Audio UK

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        • #34
          Re: Monitor 40.1 , pre-production photograph & room size

          [QUOTE=A.S.]. Your room is about the size of my listening room and I truly believe that the M40.1 is not capable of excess bass: the bass is extended and tight.

          Thanks Alan, thats great to know. Now starting to save up for a pair.

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          • #35
            Re: Monitor 40.1 , pre-production photograph & room size

            You will not be disappointed. If you are, I will offer to eat them for you!
            Alan A. Shaw
            Designer, owner
            Harbeth Audio UK

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            • #36
              Re: Monitor 40.1 , pre-production photograph & room size

              Mr Shaw, if it really happened and you happened to be too full to eat, I'd volunteer to bring the great speaker home to enjoy the feast. :P

              mike

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              • #37
                Monitor 40.1 photographs

                Here are photographs of the Monitor 40.1, production model in various settings.
                Attached Files
                Harbeth PR,
                Harbeth UK

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                • #38
                  Fireplace photo behind M40.1

                  I love the fireplace behind the speakers!! Does anybody live there? The Queen?

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                  • #39
                    Monitor 40.1 frequency response curves

                    Greetings Alan,

                    Do you have the frequency response numbers for the M40.1? I"m curious to know how they (may) differ from the M40's 40Hz-20kHz +/- 3 dB.

                    Thank you.

                    Frank Winston

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                    • #40
                      Monitor 40.1 frequency response curves

                      Hello,

                      We don't publish frequency response curves, because there are so many variables in the measurements that comparisons are impossible. Each brand develops its own methodology and refines it until their measurements convey enough information to them, which somehow correlates with what they hear. Most of us use mathematically manipulated in-room frequency responses (various smoothing techniques) to arrive at a believable quasi-anechoic curve with mental allowances for the known features of the room, according to our long term experience. Unless you could differentiate the room from the measurement the curves would be useless.

                      What I can say in that in-room (which is what really matters) the M40.1 is, under my measurement conditions and even more importantly, to my ear, exceedingly neutral, balanced and exciting. There are no oddities in an otherwise commendably flat response, and certainly no 'BBC dip' which has never been a feature of Harbeth speakers and about which there is much misunderstanding.

                      You are correct: what measurements would reveal is that the overall mid/top measured response is very similar between M40 and M40.1 +/- 1dB or so but the M40.1 is measurably and subjectively dryer and tighter in the bass in my rather sparsely damped listening room. What you really need is an outside quasi-anechoic curve, but I'm sorry to say that it's too cold outside to take one. For that we need to get up to 20 degrees C or more or an expensive re-visit to the BBC anechoic chamber, which I do not myself need now I am completely happy with the design.
                      Alan A. Shaw
                      Designer, owner
                      Harbeth Audio UK

                      Comment


                      • #41
                        Designer's options e.g. Monitor 40.1 low frequency curves (generalised)

                        I found a picture on the internet which shows a generalised situation concerning the low frequency response of most speaker systems, sealed or vented. This is not at all specific to the Monitor 40 or M40.1 (all details are different) but it shows the general idea of the designer's options.

                        Note that there are a number of frequency response (sound pressure) curves that have been overlaid. Each one represents a choice for the designer who will eventually optimise the speaker system to behave as one and only one curve. Note that all curves pass through a point which I call the 'pivot point' at, in this generic example, 60Hz. You can see that if the designer wants some more output above the pivot point this can achieved done but the trade-off is that there will be less output below that point. In other words, he can trade extension for output around the pivot frequency.

                        Although the designer will fix the parameters of the bass unit unit and/or enclosure to whatever his marketing dept. tell him is the low end sound needed by the customer, if the box is vented (ported) the user does have a small ability to swing the changes around the pivot frequency. He can stuff the port(s) with socks or similar which will have the effect of reducing output above pivot frequency and increasing below ..... but he will reduce power handling and he will probably change the sonic quality in the middle frequencies as the box can no longer 'breath'.

                        The relevance of this discussion is how it relates to the M40 and M40.1. In general terms you could say that the M40 and M40.1 have approximately the same pivot frequency, and the M40.1 has been tipped in favour of extended bass, a lower Q, and hence more compatible with typical untreated domestic rooms. The original M40 was specifically designed to mimic the BBC LS5/8 and work in traditional BBC-style control rooms where the deep wall-lagging is tuned to suck-out lots of sound in the 50-100Hz region.

                        Hope that helps.
                        Attached Files
                        Alan A. Shaw
                        Designer, owner
                        Harbeth Audio UK

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                        • #42
                          Stand height for M40.1

                          A different question from the previous discussion.

                          What is the recommended stand height for 40.1? 14" or 17"? What stand height are most people using for M40?

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                          • #43
                            Stand height for M40.1

                            Hi Chord,

                            The M 40.1 speakers were on 16" (41cm) stands at the CES show and performed wonderfully.
                            The original version mostly was placed on 20" stands, here in North America.

                            Noel Nolan.

                            Comment


                            • #44
                              Stand height for M40.1

                              Hi Skylan,

                              It seems that Sound Anchors tailor make the stands for M40.1 at two heights: 14" and 17". What would the implication on sonic difference for stands of different heights be?

                              Would you recommend 14" or 17" yourself?

                              Comment


                              • #45
                                Stand height for M40.1

                                Hi Chord,

                                Noel "Skylan" Nolen is the manufacturer of Skylan who build highly regarded speaker stands specifically for each Harbeth model. HIs webpage is http://www.skylanstands.com/stands.htm

                                Don

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