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GGNTKT Model M1

phoenixdogfan

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Please keep in mind that afaik the famous blind comparison test was (imho unfortunately) done also in mono, I personally know quite many people that prefer narrower directivity = more direct sound, I think it has also to do with the listening experience, the huge but more vague "sound cloud" of wider directivity tends to impress more less experienced listeners.
Also an extremely small sample, and never repeated with any other speaker sets. Just too little there to be probative let alone definitive.
 

roland{at}GGNTKT

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I can share some pictures taken from the review
STEREO_großerHoerraum.jpg

GGNTKT_M1_m_Staendern.jpg

GGNTKT_M1_aufm.jpg

GGNTKT_Elektronik_det.jpg
 

Puddingbuks

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What are these old fashioned speakers behind it?

I know, dynaudio confidence 40, but who cares about passive 80’s technology?
 

HooStat

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@roland{at}GGNTKT Any information on the M2? Is it intended to be "full range" in some sense? Maybe I missed some of the "basic" info that is already out there somewhere. I see that it should be out later this year so I imagine that its shape and size and design goals should be known at this point.

EDIT: I see that you answered this earlier today in another thread (#33). Looking forward to it.
 

kma100

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roland{at}GGNTKT

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Interesting speakers, though the stands look very flimsy (maybe it is just the way they were photographed).

Well, the stand is very filigree by design. But there is 8x 12mm (0.5") solid steel tubes that give stability.

The reviewer mentioned immersive/spacious sound. Is this something to do with the tweeter-waveguide setup? Or something done as part of the audio processing?

Yes, it's all about directivity. Horizontal dispersion is 140° which is wider compared to the apx. 90° of conventional designs. People tend to like the spaciousness of first side reflexions and this is what the wide dispersion does – it throws more energy to the sidewalls. The effect depends on content played and room acoustics of course.
 

Ro808

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Congrats on the excellent review in Stereo.
The M2 is a serious competitor to monitor loudspeakers from D&D, Genelec, Grimm, Kii, Neumann etc.
As a bonus, the M2 is capable of higher SPLs than the competition and attractively priced.


Similar to the Master Reference Monitor that bears the same name, the wide dispersion in the horizontal plane is the result of the 'knuckles at the throat of the waveguide. These were first introduced in the PT waveguides as an elegant, less intrusive evolution of the traditional pinched throat + diffraction slot.


Diffraction Horn (throat):

JBL 2447J + 2381.jpg



Progressive Transition Waveguides:

JBL PT Family.png



Image Control Waveguides:

Image Control WGs.jpg



Even though the throat looks quite rough (the leftover particles from the mold should definitely be removed), the JBL 2381, shown in the first image, isn't a bad horn. This is illustrated by the comparison between several horns in the attached paper. While directivity lacks behind in the vertical plane, the horizontal is fine. Moreover, the 2381 loads the driver better.


With regard to directivity and more specifically wide dispersion, an additional comment.
The spaciousness of first side reflections resulting from (very) wide dispersion might be appealing to many, one should be aware of the caveats.
If the speakers are placed close to highly reflective side walls, the off-axis energy can easily cause listening fatigue/annoyance.
It's therefore highly recommended to consider placement and room treatment.
 

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thewas

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LTig

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JeanKazamer

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May i ask what are the downsides of using compression drivers instead of regular tweeters ??
( well except for obvious additional wave guide manufacturing ... )
 

beefkabob

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Almost always, execution matters more than the underlying technology. This is 10 times over in audio, where people swap parts and get the same results because the overall design matters far more than individual bits.
 

JeanKazamer

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Then what are the major caveats for compression drivers ?

IIRC ( 15+ years ago ) the good ones were outrageously expensive
and all the other ones were riddled with distortion at good listening levels
specially from some specific frequency ( was it beak up of membrane or resonnance of the air paths ..i can't recall )
 

Scgorg

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Compression drivers, as a side effect of their design, will often have a wigglier frequency response overall (many small resonances), and can have issues with high frequency extension because a good compression ratio with such small wavelengths is hard to maintain (and for large-format compression drivers they will often have major resonances in the top octave). Some of these issues can be solved/improved with the help of DSP (and good driver design).

For benefits; the power handling and max SPL of a compression drivers vastly outclasses any direct radiating dome. The distortion spectrum of most compression drivers is also very benign, consisting almost purely of 2nd order distortion, which is most easily masked.
 
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