Please note that production of LS1s-DMF has been discontinued.
It is succeeded by SB1.
The LS1s-dmf is a technological marvel. By applying ‘Digital Motional Feedback’, a control technology from the renowned Dutch high-tech industry, it became possible to achieve exceptionally low levels of distortion and full dynamic control. With an LS1s-dmf added for the bass frequencies, the LS1 system offers low distortion over the full audio band and redefines the term ‘transparency’. This is bass control like you’ve never experienced before.
“Digital Motional Feedback offers bass control like you’ve never experienced before.”
At frequencies below 100 Hz loudspeaker drivers need to move a vast amount of air and therefore have high excursion levels, while also the fundamental resonance – which is present in any loudspeaker – induces unwanted delayed effects. The result is that all conventional loudspeakers exhibit a rising distortion in the bass region with additional “thickening” of the bass by the resonance.
In electronics, feedback is used to minimise distortion. To apply feedback in electro-mechanical systems like an active loudspeaker, an acceleration sensor needs to be mounted on the cone to monitor its motions. This so called “Motional Feedback” technology has been presented a few times before in history but the precision and control as found in the Grimm Audio LS1s-dmf is unique. By adding smart digital processing and current drive, the low distortion of the already high-performance aluminium Seas woofer is further reduced by as much as 30 dB, solving all problems that are related to low frequency resonances and distortion.
The LS1s-dmf sub is a perfect partner for the LS1v2 and an excellent match for the LS1be. It is even a smart extension for the LS1a.
Jonas Kaufmann, Herrsching am Ammerseem (LS1be)
Jonas Kaufmann, Herrsching am Ammerseem (LS1be)
Frederik DeJongh, Jerboa Mastering, Gent (LS1)
Frederik DeJongh, Jerboa Mastering, Gent (LS1)
Wessel Oltheten, Spoor 14, Boxtel (LS1s-dmf)
Wessel Oltheten, Spoor 14, Boxtel (LS1s-dmf)
Roy Ervin Solstad, Stereo+, Oslo (LS1)
Roy Ervin Solstad, Stereo+, Oslo (LS1)
Fritz Fey, Studio Magazin, Oberhausen (LS1be)
Fritz Fey, Studio Magazin, Oberhausen (LS1be)
Henk & Marja, 6Moons (LS1be)
Henk & Marja, 6Moons (LS1be)
Al Pryor, Mack Avenue Records, New York (LS1)
Al Pryor, Mack Avenue Records, New York (LS1)
Steven Maes, Motor Music, Mechelen (LS1)
Steven Maes, Motor Music, Mechelen (LS1)
Christian Rechenbach, EinsNull magazin, Duisburg (LS1)
Christian Rechenbach, EinsNull magazin, Duisburg (LS1)
Thaddeus Moore, Liquid Mastering, Eugene (LS1)
Thaddeus Moore, Liquid Mastering, Eugene (LS1)
Thaddeus Moore, Liquid Mastering, Eugene (LS1)
Thaddeus Moore, Liquid Mastering, Eugene (LS1)
Dave Collins, Dave Collins Mastering, Los Angeles (LS1)
Dave Collins, Dave Collins Mastering, Los Angeles (LS1)
Wessel Oltheten, Pro Audio & Video magazine, Buren (LS1)
Wessel Oltheten, Pro Audio & Video magazine, Buren (LS1)
Keith Howard, Hi-Fi News, Croydon (LS1)
Keith Howard, Hi-Fi News, Croydon (LS1)
Al Pryor, Mack Avenue records, Hempstead (LS1)
Al Pryor, Mack Avenue records, Hempstead (LS1)
Bogdan Roscic, President Sony Classical, Berlin (LS1)
Bogdan Roscic, President Sony Classical, Berlin (LS1)
George Massenburg, McGill University, Montreal (LS1)
George Massenburg, McGill University, Montreal (LS1)
Stefan Riel, Echo Beach, Kuala Lumpur (LS1)
Stefan Riel, Echo Beach, Kuala Lumpur (LS1)
Fritz Fey, Studio Magazin, Oberhausen (LS1)
Fritz Fey, Studio Magazin, Oberhausen (LS1)
Fritz Fey, Studio Magazin, Oberhausen (LS1)
Fritz Fey, Studio Magazin, Oberhausen (LS1)
George Massenburg, McGill University, Montreal (LS1)
George Massenburg, McGill University, Montreal (LS1)
Christian Klotzbücher, Kunstuniversität Graz, Graz (LS1)
Christian Klotzbücher, Kunstuniversität Graz, Graz (LS1)
Nigel Palmer, Audio Media, London (LS1)
Nigel Palmer, Audio Media, London (LS1)
Bart Jilesen, Studio Bart Jilesen, Utrecht (LS1)
Bart Jilesen, Studio Bart Jilesen, Utrecht (LS1)
Timothy Roth, Positive Feedback, Happy Valley (LS1)
Timothy Roth, Positive Feedback, Happy Valley (LS1)
Jan de Jeu, Music Emotion magazine, Amsterdam (LS1a)
Jan de Jeu, Music Emotion magazine, Amsterdam (LS1a)
Zhong Yi, HiFi Review, Hong Kong (LS1be)
Zhong Yi, HiFi Review, Hong Kong (LS1be)
Sam Ho, HiFi Review, Hong Kong (LS1be)
Sam Ho, HiFi Review, Hong Kong (LS1be)
Archimedes Chan, HiFi Review, Hong Kong (LS1be)
Archimedes Chan, HiFi Review, Hong Kong (LS1be)
River Chan, HiFi Review, Hong Kong (LS1be)
River Chan, HiFi Review, Hong Kong (LS1be)
Aaron Garrett, hifi enthusiast, Cambridge (LS1s-DMF)
Aaron Garrett, hifi enthusiast, Cambridge (LS1s-DMF)
Josep Armengol, Revista On Off, Madrid (LS1)
Josep Armengol, Revista On Off, Madrid (LS1)
Joachim Pfeiffer, Audio Flatscreen Journal, Wuppertal (LS1be)
Joachim Pfeiffer, Audio Flatscreen Journal, Wuppertal (LS1be)
Jaap Veenstra, Alpha Audio, Haarlem (LS1a)
Jaap Veenstra, Alpha Audio, Haarlem (LS1a)
Josep Armengol, Revista On Off, Madrid (LS1)
Josep Armengol, Revista On Off, Madrid (LS1)
Jaap Veenstra, Alpha Audio, Haarlem (LS1be)
Jaap Veenstra, Alpha Audio, Haarlem (LS1be)
Marnix Bosman, HVT magazine, Nijmegen (LS1be)
Marnix Bosman, HVT magazine, Nijmegen (LS1be)
Marja Vanderloo & Henk Boot, 6Moons (LS1be)
Marja Vanderloo & Henk Boot, 6Moons (LS1be)
Jaap Veenstra, Alpha Audio, Haarlem (LS1be)
Jaap Veenstra, Alpha Audio, Haarlem (LS1be)
Jaap Veenstra, Alpha Audio, Haarlem (LS1be)
Jaap Veenstra, Alpha Audio, Haarlem (LS1be)
Jack Liu, AudioArt magazine, Taipei (LS1)
Jack Liu, AudioArt magazine, Taipei (LS1)
Roy Ervin Solstad, Stereo+, Oslo (LS1)
Roy Ervin Solstad, Stereo+, Oslo (LS1)
Ulrich Watermann, Berlin (LS1)
Ulrich Watermann, Berlin (LS1)
Theo Wubbolts, HVT magazine, Nijmegen (LS1)
Theo Wubbolts, HVT magazine, Nijmegen (LS1)
Timothy Roth, Positive Feedback, Happy Valley (LS1)
Timothy Roth, Positive Feedback, Happy Valley (LS1)
Timothy Roth, Positive Feedback, Happy Valley (LS1)
Timothy Roth, Positive Feedback, Happy Valley (LS1)
Marshall Nack, Positive Feedback, Happy Valley (LS1)
Marshall Nack, Positive Feedback, Happy Valley (LS1)
Wolfram Eifert, AUDIOphile, Stuttgart (LS1)
Wolfram Eifert, AUDIOphile, Stuttgart (LS1)
Dimitris Stamatakos, AVMentor, Athens (LS1)
Dimitris Stamatakos, AVMentor, Athens (LS1)
Clemens Wergin, Die Welt, Berlin (LS1)
Clemens Wergin, Die Welt, Berlin (LS1)
Wolfram Eifert, AUDIO, Stuttgart (LS1)
Wolfram Eifert, AUDIO, Stuttgart (LS1)
Bernhard Rietschel, Editor in Chief of AUDIO, Stuttgart (LS1)
Bernhard Rietschel, Editor in Chief of AUDIO, Stuttgart (LS1)
Super AV magazine, Hongkong (LS1be)
Super AV magazine, Hongkong (LS1be)
Bert Oling, Hi-fi Video Test, Nijmegen (LS1)
Bert Oling, Hi-fi Video Test, Nijmegen (LS1)
Wai-Shan Lam, hifi enthusiast, Hong Kong (LS1)
Wai-Shan Lam, hifi enthusiast, Hong Kong (LS1)
Max Schlundt, Kultur...Technik, Berlin (LS1)
Max Schlundt, Kultur...Technik, Berlin (LS1)
Marja Vanderloo & Henk Boot, 6Moons (LS1)
Marja Vanderloo & Henk Boot, 6Moons (LS1)
Related Products

LS1s-dmf features
- Digital motional feedback for 30 dB less distortion
- Linear response down to 20 Hz
- Turns the LS1 into a powerful 3-way system
- DSP controlled frequency curve
- Phase corrected crossover at 70 Hz
- Seas woofer and 700W class D amplifier
- Mains outlet for LS1 minimizes cable clutter
- Version available for use without LS1
LS1s-dmf downloads
- Download the LS1 leaflet pdf
- Read the LS1 manual pdf
- Study the Loudspeaker Technique white papers
LS1s-dmf Reviews
- Fairaudio: LS1be+SB1 is fabulously realistic
- HifiPig: 5 Hearts for LS1be & MU1
- Hörerlebnis: “LS1be, SB1 & MU1 shake the audiophile worldview”
- Lowbeats: “LS1be offers unparalleled objectivity”
- Alpha Audio: “The LS1be is in its own league”
- Audiotechnique: “The LS1be has poisoned me!”
- Hifi Review: “LS1be, The impossible becomes possible”
- LS1be “loudspeaker of the decennium” at Alpha Audio
- “MU1 is magical”
- Jonas Kaufmann loves his LS1be’s
LS1s-dmf News