Your thoughts about ATC loudspeakers

@dragon_vibe

@itzhak1969

Agreed. Good points.

ATC tend to go well with big Bryston amps or amps around the 200+ watt range. Definitely not suitable for anything under about 150 watt tube amps like big Audio Research or Macintosh amps.

ATC active amps are solid state with MOSFET output stages and biased such that they are Class A to 2/3 power. So active ATC is really the best way to go with this particular brand. And this brand is best avoided by those folks who prefer to drive their speakers with tubes or those who want more personal control over the sound.

And there is No Best Speaker suited to everyone! Only the best speaker for each individual within the context of their preferences, requirements and experience. One can only say that ATC are a world class speaker chosen by many (but not all) golden eared professionals with rather specific musical requirements for a truthful presentation that allows for ease of important mix/mastering decisions of the source master tapes/files.

I'm the OP of this thread and I'm pleased that it's yielded an enduring, informed discussion. As for me, I remain interested in ATC but have not made a move. One concern that's emerged for me is whether ATC speakers do well at low volume listening. Some don't, as you know, and that could be a non-starter for me. I'm also interested in the comparison between the v19 and the v40. My local dealer prefers the 19; however, he uses a subwoofer with both models, which I am not likely to do. Anyone compared the two?

@drubin

ATC are voiced for realistic live music levels. So turned down to levels of a TV or a radio and they will sound anemic in bass (see equal loudness curves). You can of course simply boost the bass at low levels and it will sound great.

https://en.m.wikipedia.org/wiki/Equal-loudness_contour

ATC bass is not resonant like some ported designs and this means bass will not be boosted or bloated even when cranked.

ATC help sound engineers design the mixing to sound good at a loudness level that suits the music. Obviously the normal loudness listening level is different for various genres. Anything intended to be listened to at moderate to low levels needs a bass boost and anything intended to be listened to at Rock highest levels needs to have less bass.

If you always listen moderately or softly then much of the benefit of ATC massive drivers (that are low distortion even at high SPL) is going to be wasted or remain unused. Our ears can handle a huge dynamic range and much of the detail can only be entirely heard at realistic levels. If you play at a maximum of 80 dB SPL at the listener then you have around a max of 40 to 50 dB dynamic range audibly available above the noise floor. If you play such that the highest sounds are 110 dB SPL then you have an additional 30 dB of audible detail that was not available at low listening levels. It is key to understand that by cranking it you are able to hear a further 30 dB below the noise floor at a soft level and only a very robust over-engineered design of speaker can deliver this. Large ATC are like 70 dB down in 2nd and third harmonic distortion throughout the mid range - this is very clean and this is why the SCM 40 will sound clearer than the 19 which has the 3 inch mid grafted onto a 6 inch woofer.

My philosophy is to build the most accurate system possible and then if there are situations where I want to deviate from neutral for one reason or another, deal with that separately.  You can get a digital equalizer that can be used to improve low volume playback.  You could get a syrupy sounding tube pre, or maybe just a tube buffer, if you have things you like to listen to that way.  There's nothing wrong with changing things when you want a different sound, but if you start with something that is pretty far from neutral it'll be hard to guess what will happen if further color is added.

I just listened to the 40's the other day and they sounded very good with a bat amp.  Did not care for them with a Mac amp they sounded dead.  It was the mc301.   I felt the 19 really lacked after hearing the 40's.  I also went to two other stores and listened to Monitor Audio Silvers thru a MC9000 and they sounded good. They also sounded good with the primaluna amp and pre. Then I went to one more store and checked out the Harbeth speakers. The 40.2 was great, but way out of my range.  14 thousand for the pair.  Then I checked out slh5 plus, since thy are supposedly a great all around speaker, but I found the new super tweeter to bright.  Finally the speakers that blew me away were the 7es3 and the M 30.1.  Both were excellent and definitely more musical than the Atc speakers.  The 7es3 have a little more base and relaxing mods.  The M30.1 had less bass but better miss and treble.  A sliver more detailed.  I'll probably go wth the 7es3, since I focus on live music.  The 30.1 supposedly for classical and jazz, but live concerts also sounded great.  I think it's just preference in what you like.  The Harbeth speakers with all paired with a Cary amp and Cary pre with tubes.  The Rogue Cronus integrated wasn't  good with Harbeth imo.   Even though many like them.  The Cary audio was definitely better than the Rogue.   Plus the 7es3 is like 2000 dollars less than m30.1 and 2300 cheaper than the Atc40scm.  I'm gonna check my friends mac here when I do get the speakers.  If I like the Mac sound then I'll probably get a mc152 amp and c2600 pre or a c52.    Hopefully this helped!