Those with good ears will appreciate the broader palette of saturation colours. The new models look much more like the original hardware, too, and give more detailed control than the Legacy version. Each has its own vibe and both sound amazing. The 670 is the easier of the two on transients, making it slightly more aggressive, while the 660 has more total gain on the input, allowing lower thresholds to be set for more colourful compression artifacts. You could call it glue, but that doesn't cover it fully either.Įssentially, it imparts more fullness, substance and - dare we say it - 3D space. it's not necessarily 'warmth', although vocals seem fatter. Where the new ones differ sonically is in their colouration. The Legacy 670 is a favourite with many producers for its smooth and invisible level control, particularly on vocals and basses, and A/B-ing it with the new models reveals that they're all remarkably similar in that capacity. Both also offer a selection of six preset Attack/Release times, the first four going from fast to slow, and the last two with fixed attack times and automatic release dependent on the envelope of the input signal.
Apart from the dedicated stereo ones, the 660 has a very similar control set.
