ATC dilemma...

[achaiss]

Great!! I'll ask him few things too.
Experience and advices from great acousticians is always a good thing.

I see that him and Roger have flush mounted lots of room.
But sometimes I can see free standing.

It's often the double LF drivers (ATC 110, 200, 300) in soffit and the single free standing. (50, 100, 150)

[crimsonnoise]

+1 for Nick Whitaker. He improved my room hugely. Free-standing SCM50ASL here.

[achaiss]

oh yes! Effectively Nick is really helpful.

[jimdrake]

Where are you? Do you want a pair of scm200?

[achaiss]

Hello, I'm in France.
I think a pair of SCM200 Will be too expensive for me.
PM me if you want.

[achaiss]

Anyone know why the amplitude linearity of the ASL 150 is up to 17Khz, but on the ASL 200 it's "only" 12Khz... ?

It's the same HF driver... sounds strange for me. An explanation?

[Brad Lunde]

Originally Posted by achaiss

Anyone know why the amplitude linearity of the ASL 150 is up to 17Khz, but on the ASL 200 it's "only" 12Khz... ?

It's the same HF driver... sounds strange for me. An explanation?

No, its NOT the same driver. But the differences are actually more about how and when the specs were tested and written.

The 200/300s used a now discontinued 1.3 inch Audax hi power (ferro fluid cooled) tweeter till recently, this is the spec you are asking about. All new production ATC 200/300 (2012) now use a ATC built tweeter, an "SL" tweeter if you will. This new ATC tweeter is flat well beyond 20K-more like 25k unofficially. It is the best hi power tweeter on the market right now an is NOT ferro fluid cooled so does not require periodic replacement. Extraordinary.

The monitors (SCM50 -100-150) all use a 1 inch SEAS tweeter and this is fairly flat to about 20K. AN excellent device as well.

Subjectively, I have not had any customers tell me the 300 (or 200) sound different on top end vs the 150. Usually the issues are far more to do with low end differences based on room.

Brad

[achaiss]

Originally Posted by Brad Lunde

No, its NOT the same driver. But the differences are actually more about how and when the specs were tested and written.

The 200/300s used a now discontinued 1.3 inch Audax hi power (ferro fluid cooled) tweeter till recently, this is the spec you are asking about. All new production ATC 200/300 (2012) now use a ATC built tweeter, an "SL" tweeter if you will. This new ATC tweeter is flat well beyond 20K-more like 25k unofficially. It is the best hi power tweeter on the market right now an is NOT ferro fluid cooled so does not require periodic replacement. Extraordinary.

The monitors (SCM50 -100-150) all use a 1 inch SEAS tweeter and this is fairly flat to about 20K. AN excellent device as well.

Subjectively, I have not had any customers tell me the 300 (or 200) sound different on top end vs the 150. Usually the issues are far more to do with low end differences based on room.

Brad

Hi Brad!
Thank you for this precision, it's good to ear.
I knew about this new "sl" ATC tweeter but I didn't know that they are differents on SCM series.

Why don't they use their own new tweeter on all their SCM speakers, from 50 to 300? Is there a reason?

[Brad Lunde]

Originally Posted by achaiss

Hi Brad!
Thank you for this precision, it's good to ear.
I knew about this new "sl" ATC tweeter but I didn't know that they are differents on SCM series.

Why don't they use their own new tweeter on all their SCM speakers, from 50 to 300? Is there a reason?

ALl the ATC are SCM series! SCM50ASL to SCM300ASL.
The larger speakers require higher output tweeters for in all use where long term SPL is a priority. Note my previous post, they are different sizes.....
Brad

[Ribbonmicguy]

Love the scm50asl! Best investment for our mastering room!

[achaiss]

Originally Posted by Brad Lunde

ALl the ATC are SCM series! SCM50ASL to SCM300ASL.
The larger speakers require higher output tweeters for in all use where long term SPL is a priority. Note my previous post, they are different sizes.....
Brad

Sorry I misspoke.

I would say: I didn't know that there are different tweeters in use in the SCM family (from 50 to 300), I thought that there was one and only tweeter model for all the family.

Ok, now I understand why they are different on 200s and 300s.

Thanks Brad.

[EL_HERALDO]

I know it's the low end of ATC, but anyone have experience with the ATC SCM40 ?

[achaiss]

I think all SCM series have the same touch. Only the low end is really different. You should listen to them. I heard for 50, 100 and 150.

The 150s are what I need but the others were the same... With less LF response.

[Yannick]

First, I am also one of those dimwits that decided to design and build their own mastering studio. It is turning out rather good btw.

Second, I am a big fan of smaller speakers, so my vote is on the 50s plus two subs.

Having the sub separately from the speakers has several advantages: you can position the 50s for flattest response and best imaging, also there are less cabinet resonances and reflections etc.
Having the sub seprately you can then position the sub for flattest response, which in my room made a HUGE difference between the spot right under the speakers, and the flattest spot. (changed from +15-15 dB unsmoothed between 20Hz and 80Hz to +5-5 dB unsmoothed, without EQ, room not completely finished). After that you do have to time align electronically.

[Brad Lunde]

Originally Posted by EL_HERALDO

I know it's the low end of ATC, but anyone have experience with the ATC SCM40 ?

Yes, this is a hi fi speaker. Like a passive 25A but sealed low end rather than ported. So less low end than a 25A but very linear roll off.

Brad

[Paul Gold]

Originally Posted by EL_HERALDO

I know it's the low end of ATC, but anyone have experience with the ATC SCM40 ?

I have ATC 100SL's. My original plan was to give the SCM40's a go. It was a no go. They are in my closet. They are not voiced anything like the 50 -150's which sound pretty similar to each other.

[achaiss]

Originally Posted by Yannick

First, I am also one of those dimwits that decided to design and build their own mastering studio. It is turning out rather good btw.

Second, I am a big fan of smaller speakers, so my vote is on the 50s plus two subs.

Having the sub separately from the speakers has several advantages: you can position the 50s for flattest response and best imaging, also there are less cabinet resonances and reflections etc.
Having the sub seprately you can then position the sub for flattest response, which in my room made a HUGE difference between the spot right under the speakers, and the flattest spot. (changed from +15-15 dB unsmoothed between 20Hz and 80Hz to +5-5 dB unsmoothed, without EQ, room not completely finished). After that you do have to time align electronically.

That's what I've made actually with my dynaudio.
Good placement for the mains and another for the sub. Good to have a good response and fight with modes.

But It's not as accurate as a simply full range speakers with no subs and a great room.

I really want and need actually this performance.

[Brad Lunde]

Originally Posted by Paul Gold

I have ATC 100SL's. My original plan was to give the SCM40's a go. It was a no go. They are in my closet. They are not voiced anything like the 50 -150's which sound pretty similar to each other.

I don't know if I would go that far to say not anything like them....its the same mid driver but a low power version. So 380 to 3500Hz is very similar. However, a different woofer also loaded differently in the speaker than the 50/100/150 and a different tweeter above 3500Hz would make them sound different.

So Paul, you selling your 40s?
Brad

[Paul Gold]

Originally Posted by Brad Lunde

I don't know if I would go that far to say not anything like them....its the same mid driver but a low power version. So 380 to 3500Hz is very similar. However, a different woofer also loaded differently in the speaker than the 50/100/150 and a different tweeter above 3500Hz would make them sound different.

So Paul, you selling your 40s?

Have you listened to them? I really wanted to like them and use them but I couldn't.

I'd sell them. I could use the room. One of the wood tabs on the front bottom that has the standoffs is broken. Otherwise I've never used them. I think I still have the broken part.

[Brad Lunde]

Originally Posted by Paul Gold

Have you listened to them? I really wanted to like them and use them but I couldn't.

I'd sell them. I could use the room. One of the wood tabs on the front bottom that has the standoffs is broken. Otherwise I've never used them. I think I still have the broken part.

Own a pair myself.
Have you listed them for sale on ebay? They are a popular hi fi speaker.....
PM me where you bought them?
They are a passive 25.
Brad

[Trev@Circle]

I already owned a pair of 300s. My new room is approximately the same size as yours. After a great deal of consideration I decided to go with a pair of 110s and sell the 300s. I also went with Thomas at Northward Acoustics to design the place. The man is nothing short of a magician (and didn't cost the earth).

[achaiss]

I confirm that Roger AND Thomas are really helpfull too!