ATC SM75-150S Dome Mid Measurement Data

Looking at these supposed "professional" installs can be misleading.

Most of those images appear to be decidedly average looking studios. There's just as much bullshit and misinformation flying around the professional side of things as there in on the domestic side (mostly from the equipment suppliers as they tend to lead mid-level studio design now!!).

The tendancy to place the monitors up high is mostly a hangover from the traditional "soffit" mount days and guys still think that high up installs "look" correct. Modern installs tend to bring the monitor at ear level as best as they can whilst still having the meter bridge to contend with.
 
fox said:
However therefore we can infer from what you say that ATCs at 31-33-ish inches from the floor can in certain situations be considered correct placement?
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If you listen standing up and come in at around five two then yes.
 
1) Pros tend to work at a desk vs sofas for home use?

2) Pros are very tall compared to normal human beings and listen sitting down?

3) Pros are very short compared to normal human beings and listen standing up?

4) All of the above
 
In the pro environment, they basically want better than grazing incidence over the meter bridge (sometimes go as far as treating the top and rear surface of the meter bridge with absorption).

The old style soffit mount with them up high and angled down used to give a nasty reflection off the face of the mixing desk.
 
andyoz said:
Looking at these supposed "professional" installs can be misleading.

Most of those images appear to be decidedly average looking studios.
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Oooh that's funny :). Sorry to butt in on this wonderful thread, I promised I'd keep away, not sure about the others, but if I'm not mistaken the first average looking studio in that list is actually Abbey Road
 
Uncle Ants said:
Oooh that's funny :). Sorry to butt in on this wonderful thread, I promised I'd keep away, not sure about the others, but if I'm not mistaken the first average looking studio in that list is actually Abbey Road
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That's an old image. control rooms are a lot different now. They use various monitors including the Meyer X10's.:)
 
Stereo Mic said:
Your measurements sadly disguise the very issue we are talking about and are therefore of no use to the discussion. The resonance is just outside of the midrange dome's pass band.
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Every piece of evidence presented which refutes your theory is dismissed as irrelevent. It's a repeating pattern of behaviour. At least Paul's measurements are of a real ATC monitor, rather than the ersatz OEM dome measurements which you are clinging to.

And speaking of "unfounded and untrue" internet rumours, does your assertion that ATC modified the dome 18 months ago fall into the same category?

You keep saying Bob Polley says this or that, but where, Mike? Post up some links.
 
Yes and exciting a resonance not only creates amplitude products at the resonance but also at orders of magnitude out from that point as well as increased distortion.
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What does that mean?

This stuff should be avoided regardless of any intent of the designer. Its gross distortion and arguably as objectionable as harmonic distortion(which the ATC's mids do very well considering the design specifics).
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And thus far none of you, SM or BBV have made any evaluation of the excitation of the alleged resonance in actual ATC speakers.

Paul
 
Paul Ranson said:
And thus far none of you, SM or BBV have made any evaluation of the excitation of the alleged resonance in actual ATC speakers.

Paul
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We have I think started from the premise that some of us feel there is a hardness to the upper mid. We have uncovered measurements that show a clear resonance in this area, very close to the pass band of the drive unit as employed by ATC. Based on experience of break up modes with other drive units, I am reasonably confident in making the connection.

It's a bit like feeling that a car is losing grip in corners and finding bald rear tyres.
 
Stereo Mic said:
We have I think started from the premise that some of us feel there is a hardness to the upper mid. We have uncovered measurements that show a clear resonance in this area, very close to the pass band of the drive unit as employed by ATC. Based on experience of break up modes with other drive units, I am reasonably confident in making the connection.

It's a bit like feeling that a car is losing grip in corners and finding bald rear tyres.
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But not many people say that they hear this "hardness". It seems to be mostly you & brizonbiovizier (and BBV's ex, plus two unspecified "others"). You & BBV are both very inexperienced listeners in absolute terms, with minimal exposure to ATC monitors. It could well be that the ATCs which you owned were showing up a problem with the upstream gear. After all, you managed to make an SME 20 sound worse than an LP12, Mike!

In addition, you are both also rapidly acquiring "troll" status on this and other forums, so why should we believe your story when so many other people fail to confirm it, and Paul's measurements also fail to show any problem?
 
You can't see the problem on that graph because it is a composite and does not measure the drive unit in isolation. In addition, would you point out the distortion figures shown on Paul's graph?
 
What relevence to the real world does measuring a drive unit which is being pushed beyond its intended performance envelope have?

I am trying to keep this discussion relevent to the real world, but you seem to like going off at a tangent.
 


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