ATC speakers / Monitors

[Purité Audio]

Everyone would like to see some complete measurements from ATC.
Keith

 

[RexrothPigeon]

Everyone would like to see some complete measurements from ATC.

Well ATC is a new company, just started in 1974, so maybe in a few years when it gets off the ground it will have the resources for that

 

[Purité Audio]

Well Genelec are pretty new too ( also 1974 I believe) and they managed it.
Keith

 

[goat76]

Have ATC ever stopped anyone from measuring their loudspeakers?

If someone convinces Erin to review a pair of ATCs of your choice, I’m sure he will be able to do so.

 

[LEA-Ebenisterie]

Have ATC ever stopped anyone from measuring their loudspeakers?

If someone convinces Erin to review a pair of ATCs of your choice, I’m sure he will be able to do so.

I don't believe so,

I own a pair of SCM 40MkI's and I want to get rid of that horrible Vifa/Peerless tweeter by changing it to something else (Going probably for a Raven Point Source, as cossover points and sensibility fit perfectly with the SM75-150), and as I do this, also add a Subwoofer in the whole cabinetry, I measured T&S Parameters for the bass driver, sent my measurment to ATC's technical pole email, and they confirmed it plus gave me the Xmax value I asked for.

They're truely nice people, so that would be strange if they stop anyone from publishing measurments, as they seem to measure truely well from the few I took.

 

[Purité Audio]

Have ATC ever stopped anyone from measuring their loudspeakers?

If someone convinces Erin to review a pair of ATCs of your choice, I’m sure he will be able to do so.

The pertinent question is, why haven’t ATC measured their speakers themselves or sent them to be measured by an independent third party.
Keith

 

[Ultrasonic]

The pertinent question is, why haven’t ATC measured their speakers themselves or sent them to be measured by an independent third party.

ATC do provide some performance data for their models so it's not that no measurements have happened. Whether more have been made in-house or elsewhere is not something we can know though, only that they haven't published any.

 

[Sokel]

Not quite true, since the on-axis response will vary with distance due to the different path-lengths for mid and tweeter to the microphone. I was making gated measurements at the distance of my listening position as this is where I personally care about but it's something I need to find time to get back to doing properly. I had a more pronounced dip in the tweeter-mid crossover region which I want to double-check, and test for both speakers. From my initial test it was pronounced enough I was considering experimenting with some EQ to reduce this.

I have the speakers toed in to point directly at the MLP by the way. Do you not?

Edit: I should add I was making measurements at the mid-driver height - I appreciate height will affect the crossover region significantly. I actually investigated by how much. My listening position is higher than the mid-driver when normally set up, so I have now tilted the speakers back so that the MLP is on the mid-axis.

Height of measurement is absolutely a thing, gated, multigated or not:

(same at 1/24)

(the purple-yellow difference there can make a difference between a speaker and a chainsaw )

 

[Purité Audio]

ATC do provide some performance data for their models so it's not that no measurements have happened. Whether more have been made in-house or elsewhere is not something we can know though, only that they haven't published any.

Where?
Keith

 

[Ultrasonic]

Height of measurement is absolutely a thing, gated, multigated or not:

That was my point?

 

[Sokel]

That was my point?

I know, but is better with visuals.

 

[Ultrasonic]

Where?

Open any product page on the ATC site and look at the specification section. No it is not as extensive as you'd want but those numbers have come from somewhere...

 

[Purité Audio]

Specifications aren’t measurements.
Keith

 

[Ultrasonic]

Specifications aren’t measurements.

Where to you think those numbers come from? Statements about frequency response aren't just made up .

 

[Purité Audio]

Out of a hat?
Where are actual measurements it is 2026.
Keith

 

[Ultrasonic]

Out of a hat?
Where are actual measurements it is 2026.

Don't be obtuse. These figures are very obviously performance stated from measured data. There is no other appropriate way to do this.

 

[Purité Audio]

That is rather the point isn’t it, where are the measurements why don’t ATC publish them?
Keith

 

[574stereo]

Maybe they don’t think the opinion of web forum users is important. Listeners and engineers using their speakers are who they need to worry about…

 

[Blockader]

Don't be obtuse. These figures are very obviously performance stated from measured data. There is no other appropriate way to do this.

What ultimately matters is the sound power response and the early reflections directivity index. Without these, it is not possible to meaningfully evaluate a loudspeakers performance. Additional measurements like compression tests and IMD tests would also be very helpful.

 

[LEA-Ebenisterie]

That is rather the point isn’t it, where are the measurements why don’t ATC publish them?
Keith

That's rather weird for sure, but there might be a reason.

Ever tried to send them an email to ask them actual measurments ?

As said, I measured T&S Parameters + Impedence curve on one older Bass module for SCM40 MkIs and they approved it saying it matched theirs, plus gave me the Xmax parameter.