LS1s-dmf

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.

As precise as monitor speakers, yet equally pleasurable for relaxed listening, and aesthetically very attractive - this is truly an extremely rare combination.

Jonas Kaufmann, Herrsching am Ammerseem (LS1be)

Grimm Audio Loudspeakers
2019-09-26T14:51:38+00:00

Jonas Kaufmann, Herrsching am Ammerseem (LS1be)

As precise as monitor speakers, yet equally pleasurable for relaxed listening, and aesthetically very attractive - this is truly an extremely rare combination.
I won't get my monitoring better than this. Mastering party all day, every day!

Frederik DeJongh, Jerboa Mastering, Gent (LS1)

Grimm Audio Loudspeakers
2014-03-05T16:04:12+00:00

Frederik DeJongh, Jerboa Mastering, Gent (LS1)

I won't get my monitoring better than this. Mastering party all day, every day!
These dmf subs are insane! It took me 30 seconds to decide I had to buy them. Authoritative, open, tight, life-like, in one word: wow!

Wessel Oltheten, Spoor 14, Boxtel (LS1s-dmf)

Grimm Audio Loudspeakers
2018-11-29T16:04:28+00:00

Wessel Oltheten, Spoor 14, Boxtel (LS1s-dmf)

These dmf subs are insane! It took me 30 seconds to decide I had to buy them. Authoritative, open, tight, life-like, in one word: wow!
I've played everything from Rammstein to chamber music on these speakers, and they eat everything raw.

Roy Ervin Solstad, Stereo+, Oslo (LS1)

Grimm Audio Loudspeakers
2018-11-29T16:04:41+00:00

Roy Ervin Solstad, Stereo+, Oslo (LS1)

I've played everything from Rammstein to chamber music on these speakers, and they eat everything raw.
You must hear that! Absolutely!

Fritz Fey, Studio Magazin, Oberhausen (LS1be)

Grimm Audio Loudspeakers
2018-11-29T16:04:54+00:00

Fritz Fey, Studio Magazin, Oberhausen (LS1be)

You must hear that! Absolutely!
Total peace of mind

Henk & Marja, 6Moons (LS1be)

Grimm Audio Loudspeakers
2018-11-29T16:05:05+00:00

Henk & Marja, 6Moons (LS1be)

Total peace of mind
A second Grammy: your technology helped me get there...

Al Pryor, Mack Avenue Records, New York (LS1)

Grimm Audio Loudspeakers
2018-11-29T16:05:16+00:00

Al Pryor, Mack Avenue Records, New York (LS1)

A second Grammy: your technology helped me get there...
Just recorded Mahler 1 with Filharmonie and Edo de Waart. We had the Grimm LS1's on trial. Never heard so much in a recording, really impressive.

Steven Maes, Motor Music, Mechelen (LS1)

Grimm Audio Loudspeakers
2018-11-29T16:05:28+00:00

Steven Maes, Motor Music, Mechelen (LS1)

Just recorded Mahler 1 with Filharmonie and Edo de Waart. We had the Grimm LS1's on trial. Never heard so much in a recording, really impressive.
This is probably the most 'correct' loudspeaker I've ever laid ears on. The combined honesty, neutrality and pleasing musicality is at a level that I haven't come across before.

Christian Rechenbach, EinsNull magazin, Duisburg (LS1)

Grimm Audio Loudspeakers
2011-12-24T16:05:42+00:00

Christian Rechenbach, EinsNull magazin, Duisburg (LS1)

This is probably the most 'correct' loudspeaker I've ever laid ears on. The combined honesty, neutrality and pleasing musicality is at a level that I haven't come across before.
I want to congratulate you for making the best sounding, most phase linear, transient accurate, and all around beautiful speaker system on the planet

Thaddeus Moore, Liquid Mastering, Eugene (LS1)

Grimm Audio Loudspeakers
2018-11-29T16:05:56+00:00

Thaddeus Moore, Liquid Mastering, Eugene (LS1)

I want to congratulate you for making the best sounding, most phase linear, transient accurate, and all around beautiful speaker system on the planet
I have already made better, faster decisions in my mixes, and have had more confidence in delivering my masters.

Thaddeus Moore, Liquid Mastering, Eugene (LS1)

Grimm Audio Loudspeakers
2018-11-29T16:06:16+00:00

Thaddeus Moore, Liquid Mastering, Eugene (LS1)

I have already made better, faster decisions in my mixes, and have had more confidence in delivering my masters.
Truly a remarkable system, the equal or better of anything I've ever heard.

Dave Collins, Dave Collins Mastering, Los Angeles (LS1)

Grimm Audio Loudspeakers
2018-11-29T16:06:42+00:00

Dave Collins, Dave Collins Mastering, Los Angeles (LS1)

Truly a remarkable system, the equal or better of anything I've ever heard.
You have to work hard on the LS1's to get a good sounding mix, but once you have it, you can be sure it really is a good mix.

Wessel Oltheten, Pro Audio & Video magazine, Buren (LS1)

Grimm Audio Loudspeakers
2018-11-29T16:07:03+00:00

Wessel Oltheten, Pro Audio & Video magazine, Buren (LS1)

You have to work hard on the LS1's to get a good sounding mix, but once you have it, you can be sure it really is a good mix.
The LS1's frequency response is unusually flat - indeed the flattest we've ever measured.

Keith Howard, Hi-Fi News, Croydon (LS1)

Grimm Audio Loudspeakers
2018-11-29T16:07:17+00:00

Keith Howard, Hi-Fi News, Croydon (LS1)

The LS1's frequency response is unusually flat - indeed the flattest we've ever measured.
After all these years I finally have a standard on which I can rely.

Al Pryor, Mack Avenue records, Hempstead (LS1)

Grimm Audio Loudspeakers
2011-12-16T16:07:41+00:00

Al Pryor, Mack Avenue records, Hempstead (LS1)

After all these years I finally have a standard on which I can rely.
This is the most exciting, strange, beautiful, ridiculously convenient piece of non-audiophile audiophile gear I have seen or heard. These things are a bit science fiction really.

Bogdan Roscic, President Sony Classical, Berlin (LS1)

Grimm Audio Loudspeakers
2018-11-29T16:07:57+00:00

Bogdan Roscic, President Sony Classical, Berlin (LS1)

This is the most exciting, strange, beautiful, ridiculously convenient piece of non-audiophile audiophile gear I have seen or heard. These things are a bit science fiction really.
My audition of the LS1 was a transformative experience.

George Massenburg, McGill University, Montreal (LS1)

Grimm Audio Loudspeakers
2018-11-29T16:08:10+00:00

George Massenburg, McGill University, Montreal (LS1)

My audition of the LS1 was a transformative experience.
What impressed me the most is the purity of the sound and the sound field in general. (...) You can work so fast now to get the sound right!

Stefan Riel, Echo Beach, Kuala Lumpur (LS1)

Grimm Audio Loudspeakers
2018-11-29T16:08:22+00:00

Stefan Riel, Echo Beach, Kuala Lumpur (LS1)

What impressed me the most is the purity of the sound and the sound field in general. (...) You can work so fast now to get the sound right!
One for all and everything.

Fritz Fey, Studio Magazin, Oberhausen (LS1)

Grimm Audio Loudspeakers
2018-11-29T16:08:37+00:00

Fritz Fey, Studio Magazin, Oberhausen (LS1)

One for all and everything.
Not something good, but something already exquisite has further been improved.

Fritz Fey, Studio Magazin, Oberhausen (LS1)

Grimm Audio Loudspeakers
2018-11-29T16:09:01+00:00

Fritz Fey, Studio Magazin, Oberhausen (LS1)

Not something good, but something already exquisite has further been improved.
I could not be more impressed.

George Massenburg, McGill University, Montreal (LS1)

Grimm Audio Loudspeakers
2012-10-17T16:09:14+00:00

George Massenburg, McGill University, Montreal (LS1)

I could not be more impressed.
I heard the LS1 in NYC at the AES Convention... man, I was really impressed. Although it was at the booth, I could identify my mix immediately. So far the best speakers I've heard.

Christian Klotzbücher, Kunstuniversität Graz, Graz (LS1)

Grimm Audio Loudspeakers
2018-11-29T16:09:27+00:00

Christian Klotzbücher, Kunstuniversität Graz, Graz (LS1)

I heard the LS1 in NYC at the AES Convention... man, I was really impressed. Although it was at the booth, I could identify my mix immediately. So far the best speakers I've heard.
I had that feeling of an open window into sound, across a wide range of music styles.

Nigel Palmer, Audio Media, London (LS1)

Grimm Audio Loudspeakers
2018-11-29T16:09:39+00:00

Nigel Palmer, Audio Media, London (LS1)

I had that feeling of an open window into sound, across a wide range of music styles.
I've listened to so much music and films and heard space and details I have never heard before.

Bart Jilesen, Studio Bart Jilesen, Utrecht (LS1)

Grimm Audio Loudspeakers
2018-11-29T16:09:52+00:00

Bart Jilesen, Studio Bart Jilesen, Utrecht (LS1)

I've listened to so much music and films and heard space and details I have never heard before.
These are the most immersive, dynamic, detail-rich, nuanced, elegant, engaging, emotional, and yes, musical speakers I have ever heard. By far.

Timothy Roth, Positive Feedback, Happy Valley (LS1)

Grimm Audio Loudspeakers
2014-10-18T16:10:04+00:00

Timothy Roth, Positive Feedback, Happy Valley (LS1)

These are the most immersive, dynamic, detail-rich, nuanced, elegant, engaging, emotional, and yes, musical speakers I have ever heard. By far.
Phenomenal!

Jan de Jeu, Music Emotion magazine, Amsterdam (LS1a)

Grimm Audio Loudspeakers
2018-07-01T12:43:01+00:00

Jan de Jeu, Music Emotion magazine, Amsterdam (LS1a)

Phenomenal!
The Grimm LS1be offers a much higher absolute audio quality than all of the overpriced astronomical speakers on today's premium audio market.

Zhong Yi, HiFi Review, Hong Kong (LS1be)

Grimm Audio Loudspeakers
2018-06-15T12:45:13+00:00

Zhong Yi, HiFi Review, Hong Kong (LS1be)

The Grimm LS1be offers a much higher absolute audio quality than all of the overpriced astronomical speakers on today's premium audio market.
The low-frequency temporal resolution is high, and the rendering of tonal pitch in the extremely low-frequency range is very precise.

Sam Ho, HiFi Review, Hong Kong (LS1be)

Grimm Audio Loudspeakers
2018-06-15T12:46:41+00:00

Sam Ho, HiFi Review, Hong Kong (LS1be)

The low-frequency temporal resolution is high, and the rendering of tonal pitch in the extremely low-frequency range is very precise.
It will be almost impossible to achieve the same sound quality when spending the same price on separate hifi components.

Archimedes Chan, HiFi Review, Hong Kong (LS1be)

Grimm Audio Loudspeakers
2018-06-15T12:48:17+00:00

Archimedes Chan, HiFi Review, Hong Kong (LS1be)

It will be almost impossible to achieve the same sound quality when spending the same price on separate hifi components.
If you like a fast, solid and accurate music reproduction for all kinds of music, this system will surprise you!

River Chan, HiFi Review, Hong Kong (LS1be)

Grimm Audio Loudspeakers
2018-06-15T12:50:05+00:00

River Chan, HiFi Review, Hong Kong (LS1be)

If you like a fast, solid and accurate music reproduction for all kinds of music, this system will surprise you!
Those subwoofers are pretty darned impressive. Thanks!

Aaron Garrett, hifi enthusiast, Cambridge (LS1s-DMF)

Grimm Audio Loudspeakers
2017-11-23T12:52:49+00:00

Aaron Garrett, hifi enthusiast, Cambridge (LS1s-DMF)

Those subwoofers are pretty darned impressive. Thanks!
With the Grimm LS1 unexpected details appear in the recordings: nothing is hidden, and everything sounds delicious.

Josep Armengol, Revista On Off, Madrid (LS1)

Grimm Audio Loudspeakers
2017-10-06T12:54:50+00:00

Josep Armengol, Revista On Off, Madrid (LS1)

With the Grimm LS1 unexpected details appear in the recordings: nothing is hidden, and everything sounds delicious.
The jury could only applaud.

Joachim Pfeiffer, Audio Flatscreen Journal, Wuppertal (LS1be)

Grimm Audio Loudspeakers
2017-05-01T12:57:56+00:00

Joachim Pfeiffer, Audio Flatscreen Journal, Wuppertal (LS1be)

The jury could only applaud.
We are honestly not able to assemble a component based system that performs better than this active system from Holland.

Jaap Veenstra, Alpha Audio, Haarlem (LS1a)

Grimm Audio Loudspeakers
2017-09-29T12:59:44+00:00

Jaap Veenstra, Alpha Audio, Haarlem (LS1a)

We are honestly not able to assemble a component based system that performs better than this active system from Holland.
Grimm's mission to eliminate the sound of the system and present just the original recording seems totally achieved.

Josep Armengol, Revista On Off, Madrid (LS1)

Grimm Audio Loudspeakers
2017-10-06T13:01:17+00:00

Josep Armengol, Revista On Off, Madrid (LS1)

Grimm's mission to eliminate the sound of the system and present just the original recording seems totally achieved.
This is such an incredibly good speaker.

Jaap Veenstra, Alpha Audio, Haarlem (LS1be)

Grimm Audio Loudspeakers
2017-10-05T13:03:32+00:00

Jaap Veenstra, Alpha Audio, Haarlem (LS1be)

This is such an incredibly good speaker.
The LS1be has a very beautiful low end, that not only goes to great depth, but is of exceptional pureness.

Marnix Bosman, HVT magazine, Nijmegen (LS1be)

Grimm Audio Loudspeakers
2017-01-07T13:06:35+00:00

Marnix Bosman, HVT magazine, Nijmegen (LS1be)

The LS1be has a very beautiful low end, that not only goes to great depth, but is of exceptional pureness.
Truly, this could be the last system you'll ever buy; an endgame solution.

Marja Vanderloo & Henk Boot, 6Moons (LS1be)

Grimm Audio Loudspeakers
2016-09-16T13:14:55+00:00

Marja Vanderloo & Henk Boot, 6Moons (LS1be)

Truly, this could be the last system you'll ever buy; an endgame solution.
We don’t often have tears in our eyes when listening to music at our office. Now we do.

Jaap Veenstra, Alpha Audio, Haarlem (LS1be)

Grimm Audio Loudspeakers
2016-09-14T13:16:56+00:00

Jaap Veenstra, Alpha Audio, Haarlem (LS1be)

We don’t often have tears in our eyes when listening to music at our office. Now we do.
Let the LS1be bring you back to the essence: enjoy music. More intense than ever.

Jaap Veenstra, Alpha Audio, Haarlem (LS1be)

Grimm Audio Loudspeakers
2016-09-14T13:18:36+00:00

Jaap Veenstra, Alpha Audio, Haarlem (LS1be)

Let the LS1be bring you back to the essence: enjoy music. More intense than ever.
Accurate, transparent and beautiful, that is the Grimm Audio LS1.

Jack Liu, AudioArt magazine, Taipei (LS1)

Grimm Audio Loudspeakers
2016-07-15T13:21:35+00:00

Jack Liu, AudioArt magazine, Taipei (LS1)

Accurate, transparent and beautiful, that is the Grimm Audio LS1.
You will have to go to great lengths to find something that matches this sound quality for the same price.

Roy Ervin Solstad, Stereo+, Oslo (LS1)

Grimm Audio Loudspeakers
2016-07-02T13:24:11+00:00

Roy Ervin Solstad, Stereo+, Oslo (LS1)

You will have to go to great lengths to find something that matches this sound quality for the same price.
I’m afraid my english isn’t good enough to describe the overwhelming feeling while listening to music, reproduced by the LS1.

Ulrich Watermann, Berlin (LS1)

Grimm Audio Loudspeakers
2016-06-13T13:26:09+00:00

Ulrich Watermann, Berlin (LS1)

I’m afraid my english isn’t good enough to describe the overwhelming feeling while listening to music, reproduced by the LS1.
Best sound of show, stunning, Meisterhaft.

Theo Wubbolts, HVT magazine, Nijmegen (LS1)

Grimm Audio Loudspeakers
2015-07-01T13:31:09+00:00

Theo Wubbolts, HVT magazine, Nijmegen (LS1)

Best sound of show, stunning, Meisterhaft.
These are the best speakers on the planet. Period.

Timothy Roth, Positive Feedback, Happy Valley (LS1)

Grimm Audio Loudspeakers
2014-12-19T15:09:14+00:00

Timothy Roth, Positive Feedback, Happy Valley (LS1)

These are the best speakers on the planet. Period.
As it turns out, Truth equals Love.

Timothy Roth, Positive Feedback, Happy Valley (LS1)

Grimm Audio Loudspeakers
2014-10-18T15:13:28+00:00

Timothy Roth, Positive Feedback, Happy Valley (LS1)

As it turns out, Truth equals Love.
This is the first plug-n-play, all-in-one, system with true high-end sound.

Marshall Nack, Positive Feedback, Happy Valley (LS1)

Grimm Audio Loudspeakers
2013-12-05T15:29:17+00:00

Marshall Nack, Positive Feedback, Happy Valley (LS1)

This is the first plug-n-play, all-in-one, system with true high-end sound.
The naturalness of the LS1 turns me on big time.

Wolfram Eifert, AUDIOphile, Stuttgart (LS1)

Grimm Audio Loudspeakers
2013-11-28T15:37:24+00:00

Wolfram Eifert, AUDIOphile, Stuttgart (LS1)

The naturalness of the LS1 turns me on big time.
This is a speaker that sets a reference level and everybody should hear it, regardless of whether he intends to buy it or not !

Dimitris Stamatakos, AVMentor, Athens (LS1)

Grimm Audio Loudspeakers
2013-11-26T15:39:02+00:00

Dimitris Stamatakos, AVMentor, Athens (LS1)

This is a speaker that sets a reference level and everybody should hear it, regardless of whether he intends to buy it or not !
The system (...) is the equal of systems of hundred thousands of Euros when it comes to aspects like neutrality, purity and naturalness of tone.

Clemens Wergin, Die Welt, Berlin (LS1)

Grimm Audio Loudspeakers
2013-05-13T15:41:20+00:00

Clemens Wergin, Die Welt, Berlin (LS1)

The system (...) is the equal of systems of hundred thousands of Euros when it comes to aspects like neutrality, purity and naturalness of tone.
The LS1 is by far the best speaker that AUDIO had the pleasure of reviewing in over 35 years; this especially in the two crucial audiophile disciplines of neutrality and detail reproduction.

Wolfram Eifert, AUDIO, Stuttgart (LS1)

Grimm Audio Loudspeakers
2013-04-13T15:44:54+00:00

Wolfram Eifert, AUDIO, Stuttgart (LS1)

The LS1 is by far the best speaker that AUDIO had the pleasure of reviewing in over 35 years; this especially in the two crucial audiophile disciplines of neutrality and detail reproduction.
Their natural sound and their unimposing, deep trueness kept overwhelming me and my colleagues.

Bernhard Rietschel, Editor in Chief of AUDIO, Stuttgart (LS1)

Grimm Audio Loudspeakers
2013-04-12T15:47:00+00:00

Bernhard Rietschel, Editor in Chief of AUDIO, Stuttgart (LS1)

Their natural sound and their unimposing, deep trueness kept overwhelming me and my colleagues.
The LS1be transfers the original emotion of the music performance

Super AV magazine, Hongkong (LS1be)

Grimm Audio Loudspeakers
2019-03-09T10:43:35+00:00

Super AV magazine, Hongkong (LS1be)

The LS1be transfers the original emotion of the music performance
Did Grimm Audio reinvent the loudspeaker?

Bert Oling, Hi-fi Video Test, Nijmegen (LS1)

Grimm Audio Loudspeakers
2011-04-01T16:03:38+00:00

Bert Oling, Hi-fi Video Test, Nijmegen (LS1)

Did Grimm Audio reinvent the loudspeaker?
The LS1 seems to be a melting pot for all your expertises. I just find it fascinating. I am quite certain that the LS1 is at least the very very best 'value' in the market right now.

Wai-Shan Lam, hifi enthusiast, Hong Kong (LS1)

Grimm Audio Loudspeakers
2012-01-26T16:14:37+00:00

Wai-Shan Lam, hifi enthusiast, Hong Kong (LS1)

The LS1 seems to be a melting pot for all your expertises. I just find it fascinating. I am quite certain that the LS1 is at least the very very best 'value' in the market right now.
If someone came up with the idea to call the LS1 the best speakers he's ever heard, I would join in with a smile.

Max Schlundt, Kultur...Technik, Berlin (LS1)

Grimm Audio Loudspeakers
2011-12-19T16:18:46+00:00

Max Schlundt, Kultur...Technik, Berlin (LS1)

If someone came up with the idea to call the LS1 the best speakers he's ever heard, I would join in with a smile.
For those looking after the exact sound of a recording, the Grimm solution cannot be beat.

Marja Vanderloo & Henk Boot, 6Moons (LS1)

Grimm Audio Loudspeakers
2012-10-24T16:20:27+00:00

Marja Vanderloo & Henk Boot, 6Moons (LS1)

For those looking after the exact sound of a recording, the Grimm solution cannot be beat.
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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
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