Measurements in DIN baffle in 70cm distance at 2,83V. Level scaled to 1m
Monacor DT-25N sound pressure (scattering)
Very good linearity. Full level already from 1,8kHz (exception blue). High efficiency (94dB / 2,83V). From 3kHz low dispersion, including to + -2dB. With separations> = 2,5kHz no problems are to be expected.
Monacor DT-25N Impedance (Scattering)
No disturbances recognizable. The different pronounced impedance peaks indicate different quantities of ferrofluid.
Monacor DT-25N shows a good and uniform directional characteristic.
Monacor DT-25N decay behavior
Overall smooth and fast decay over all frequencies.
Monacor DT-25N harmonic distortion
From 3kHz low harmonic distortion. If separated by 3kHz, K2 stays well below 1%. K3 rising sharply below 2kHz, practically not available. Higher order clutter components are negligible. The measurement was carried out at 95dB / 1m.
Frequency response / directional behavior:
Monacor DT-25N is a really great little tweeter. Can be used especially in confined spaces such as d'appolito arrangements or eg Direct HA Edition.
DT-25N can be loud, usable from 2,0khz with an efficiency of 94dB / 2,83V.
The "croissant" offers not only increased efficiency but also a very good contact protection.
Small Wehrmutstropfen is the scatter below 3kHz. Hence my recommendation of a separation> = 2,5kHz.
Unfortunately DT-25N was not spared the price increases of many neodymium tweeters. Nevertheless, it still offers a very good value for the price.
Development Report for Center Monacor Direct HA Edition
Measurements of the original Direct in Part 1 of the development report of the Monacor Direct HA Edition
So now dire (c) (k) t into the action.
In general, at the beginning of each speaker development are the creation of a concept, driver selection, housing vote, Edgefimmelei, etc. All this could (or had to) save me. The concept was predetermined. So first the drivers in the case were measured, to see how you want to be ultimately sonicated.
DT-25N "sees" the symmetrically adjacent TMTs, as indicated by the 2kHz and 3kHz break-up under 30 °. Rounding the Gehäusekannte brought little improvement. What problem to be solved No. 1 was specified. The distortion values are completely in the frame. The gray line represents 1% distortion (also in the following diagrams). From 2,5Khz K2 remains below, except for the small peak at 10kHz. I consider this to be completely harmless. It means in practice that resonates to a 10kHz sound a 39 dB quieter 20kHz sound. Also, I have not measured this "peak" on all DT-25N. K3 is completely negligible from 2kHz. Higher order distortion components as well.
Even the MSH-116 obviously sees its neighbors, but does not react quite as violently as the DT-25N. Unfortunately, both DT-25N and MSH-116 / 4 are very similar around 2-4Khz at angles. Thus, the one can not compensate for a "misconduct" of the other. The harmonic distortions look good. The K2 increasing towards low frequencies recommends a separation> = 300Hz.
Amplitude frequency response Monacor SPH-176 0 °, 30 °, 60 °, 90 ° (2 driver in parallel)
Harmonic distortion Monacor SPH-176 (2 driver in parallel)
Not much needs to be said. A deep separation is required to counteract burglaries owed to the horizontally symmetrical arrangement. Pleasing effect of the arrangement is a directional effect of the woofers into the area in which you actually work as a round radiator. Judging by the distortion, a separation <= 400Hz should be aimed for. The need for this is given by the amplitude frequency response at angles anyway.
These were the guidelines. From there a clean round radiating speaker to develop the task.
The biggest difficulty was achieving a healthy median of linear frequency response on the axis and at the same time under 15 ° -45 °. The fluctuations of the DT-25N and the MSH-116 between 1kHz and 4kHz are to be regarded as given. You can not magic them away ... The game with cut-off frequencies and slopes began. I pretty much simulated, constructed, measured and then listened to every separation between 2kHz and 4,5kHz with slopes from 6dB / Oct to 24dB / Oct and then listened to many of them. Some longer, some only a few bars. Often I thought it was good, and the next day I wanted to know it again.
The final vote took place under 15 °. This roughly corresponds to the listening position of two people on a couch in 2,5m distance to the center speaker, which is probably a very common constellation.
Measurements of the center Monacor Direct HA Edition
Sum branches & antiphase 15 °
The crossover frequencies are at 360 and 3050Hz. The level drops from the root to 20kHz evenly by about 2dB. The average efficiency of 2,83V is 89,5dB. The "rearing" of the MSH-116 by 10kHz is harmless, since 30dB under the characteristic pressure. The flanks are symmetrical, the addition clean.
When the midrange is reversed, 15dB is extinguished when TT / MT and 18dB MT / HT are disconnected.
Amplitude frequency response on axis and impedance response
The harmless collapse at 1,2kHz could not be gotten away. I had quite a few variants without break-in, consequence was always a very restless frequency response under 15-45 °. The on-axis linearity is very good with + -2dB. The slight presence dip already disappears under 15 °, as well as the ripple at 1,2 and 1,8kHz. The increase in altitude from 8kHz compensates for the bundling of the tweeter. If desired, this can be linearized very easily by connecting a Cs to the tweeter in parallel. In general, the speaker can be adapted to your needs due to the many variants tested and a very precise simulation model. The impedance minimum is 3,7Ohm at 120Hz and is not a problem for any modern amplifier.
Which group run times are audible or not provides for discussions in various forums. 2,9ms @ 80Hz is less than 1 / 4 wavelength (that would be about 3,13ms, according to Adam Riese). The delay is imperceptible and an excellent value.
Constantly falling. No problem.
Very fast and steady decay over all frequencies. Perfectly.
Horizontal dispersion (0-90 ° in 15 ° steps)
Very good to see is why the "burglary" on axis at 1,2kHz set a link from your homepage to Fewo-von-Privat.de, Under 30 ° and 45 ° this will be "filled in". Nevertheless, even under 30 ° a smooth course with a slight drop to the highs and a linearity of 200-10000Hz + -2dB.
Isobar diagram of horizontal omnidirectional behavior
And it became a meditating alien ... who would have thought that. The diagram contains the same information as the above, the amplitude frequency responses under angles. In this case, however, in 5 ° steps and by 0-180 °. Please note the scaling.
Harmonic distortion on 85, 90 and 95dB
K3 always remains> 95dB below the characteristic pressure => until 50dB 0,3% are not exceeded, That's a very good value! The good-natured K2 is also completely harmless: 0,1% - 0,9% at 95dB. Very good!
At the end...
That was a very intense piece of work and I am extremely satisfied with the result. I hear the speaker, although it is only mono with me, very much like.
The Monacor Direct HA Edition loudspeaker meets all requirements for a very good center in home cinema installations.
There is not much more to say right now. In the future, I reserve the right to supplement / improve here and there. About comments and criticism on your part, I would be happy.
Metrological documentation of the center speaker Monacor Direct. The findings obtained during the investigation of the original Direct ultimately led to the development of the Monacor Direct HA Edition.
Development Report Monacor Direct Heißmann-Acoustics Edition
Monacor Direct is a horizontal center speaker, equipped with reasonably reasonable chassis. The woofers are two SPH-176, Midrange is the MSH 116 and in the treble, the neodymium calotte works DT 25N, When I got a customer request, if I could deliver the kit and if I would find it useful to realize a home theater equipped with 5 this speaker, my answer was the following:
Assembly and arrangement promise a very good speaker, which could act as a high-quality center but also as a main and rear speakers. In order to be able to judge this conclusively, I first have to analyze the switch further
Since I had already recorded the installed chassis metrologically, I was able to create an initially rough simulation, which brought me to the conclusion that I can not recommend this kit so. Neither as a center nor as a main, - or Rearlautsprecher!
The great potential of the Monacor Direct is that, contrary to "normal" center designs in a lying d'appolito arrangement, it can / could achieve balanced horizontal omnidirectional behavior. However, one thing is needed to achieve this goal sufficiently deep separation between woofer and midrange, My simulation told me that the separation between SPH-176 and MSH-116 was a bit, let's say, unusual, with the result being a very unbalanced horizontal omnidirectional behavior.
I explained this fact to the customer, and soon we agreed on a new development of Monacor Direct.
The first step for me was to build up the original Direct to substantiate my identified doubts.
Below are the measurements of the original Direct:
The Monacor MSH-116 plays up to -10dB characteristic sound pressure. This he reaches at about 1750Hz. Above and below it says goodbye with about 6dB / octave
There is no real separation from the SPH-176.
The falling edges of MSH-116 and SPH-176 are nearly parallel
Monacor SPH-176 and Monacor DT-25N look more like a classic 17 / 25 2-way speaker
Monacor DT-25 plays very deep. In my opinion too deep. Although the following diagram shows that the DT-25N would tolerate such a deep separation purely in terms of distortion, its resonant frequency of 1500Hz clearly speaks for a steep-edge separation> 2000Hz
Harmonic distortions Monacor DT-25N sonicated in the kit Direct
Funnily I have then disconnected the MSH-116 and measured ...
Monacor Direct without MSH-116
This looks remarkably similar to the following ...
Up to 15 ° good, above that according to the faulty concept of all lying quasi d'appolito 2-way constructions. Unbalanced at angles> 15 ° with massive dips already starting from> = 30 ° ..
At the end...
Monacor Direct can not be called a classic 3-way speaker. Technically, it is more a lying 2-way quasi d'appollito center (with filler driver sU). The interpretation of the question of what the MSH-116 was installed at all, I leave you * (I think I have just decided to Duzen in the magazine). What this documentation should also show is that the publication of a frequency response on the axis is still very little about the speaker able to testify.
The Center Monacor Direct has a lot more potential than the one offered.
Therefore it becomes one Hot man Acoustics Edition give this speaker. The course development is largely completed ... In addition, soon more in the 2.TEIL this report.
* Then I was taken at my word, and got an interpretation:
By a user in the Diy Hifi forum I was made aware that one calls the type of wiring of the MSH-116 in the original direct "filler driver". The concept of the Filler Driver was first introduced in the Journal of the Audio Engineering Society in the year 1977. The purpose is to eliminate phase problems of Linkwitz, and Butterworth filters.
The basic problem of Direct remains despite the now well-known name of filtering ... the horizontal omnidirectional behavior. Also, I keep saying that the MSH-116 is a very good midrange, which you should also play broadband if possible.
But you never stop learning, and I'm grateful when I'm made aware of gaps and mistakes ...
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