ATC scm 19 vs ATC scm 20SL?

Almost the entire line of ATC products has the same signature sound. As you move into the line, you get better integrated bass, better dynamics and transients, and better build in the cones and cabinets. But unlike most brands, these have a very similar sonic footprint around being very precise and uncolored, and truly, there are subtle improvements through the line. They are both inefficient speakers and require heavy duty amps to drive them. Tubes are not a consideration. The 19s are different than the 20s in that they appear to break in faster. The 20s take at least 800 to 1000 solid hours to burn in; the 19s about 500. Both throw a wide soundstage and play a wide variety of genres well. If space or room dimensions are limited, I would go down a level and look at the 16As.

One of the major difference b/t the 19 and the 20 is the tweeter. The older 20s uses a vifa tweeter and the newer 20s uses a seas tweeter. Both EXTREMELY revealing and very smooth, with the seas having a bit more detail (very hard to hear a difference, but better specs are better specs)...same goes for the non-SL vs the SL spec-ed 20s. I can't hear a difference really...but that is probably because I never hear it in the same room, and I always ask to demo them on tube-preamps.

The 19 uses ATC inhouse tweeter and are more meant towards home usage. ATC tame down the speaker so that the average recording sound a bit easier on the ear...although they are still very unforgiving.

The SCM20 and SCM20SL to the SCM50, SCM100 were meant for pro use. The ATC SCM40, SCM35, SCM19, SCM11, and SCM7 are meant for home use. Although they both carry the signature sound, they are quite different. If you are used to the "pro" sound you may think that the Entry Series may lack something. I tried going to the Entry series, but the sound is not as detailed nor is the speaker as transparent to source change. This does not mean the Entry series is not as good. Both series are like intensive X-Ray machines, its just that the Pro will do the full X-ray and has a zoom-in feature if you know what I mean.

But those are still very minor critiques. Both Pro and Entry level are great speakers. The entry level will trump most speaker if you are looking for the most uncolor speaker you can find.

Just remember to power them correctly if not, the ATC will be the most ugly sounding speaker ever. You will hate them. Also take into account that most of your recordings are will be unbearable to listen to, even with great electronics. They will spit out what is fed. If you look at my system, I used 2 huge monoblock class A amps to power them. However, I opted for a tube preamp because 75% of my music collection are not perfect recordings.

If you want the most extreme of the extreme, you can always opt for an all byston setup with the ATC. Then you have a system that is so precise it can surgically remove the music bit by bit.

whew..hope that wasn't too much info.

I think BongoB and Kinn got most of it covered. The 19 uses the same SL woofer/midrange driver so apart from a slight difference from the better tweeter extension (2.8Khz and up) they should sound pretty much the same. I have not opened a 19 up so I am not sure if they use the same good quality supersound polyproplene caps and air core inductors in their older models but I expect they do.

Judging by looks of the cabinet it has been engineered/designed to be mass produced at lower labor cost compared to the intricate work on the SCM 20SL. The 19 can be used without grills due to the rounded edges. The standard domestic 20SL needs grills installed to help reduce edge diffraction.

Since the SCM19 is cheaper i'd say it is better value but apart from that you are talking about substantially the same speaker.

Any comments on the sound of the SCM16A with a good tube preamp (say one using PX4 & 6NS7 tubes? Thanks!