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For those who love to have deep understanding of our unique DMF digital motional feedback subwoofer, we just published no less than four white papers by its designer Rob Munnig Schmidt: a tutorial about how loudspeakers work, an essay about why to avoid bassreflex designs, a white paper about acceleration based motional feedback subwoofers and a paper about how to actually realize an acceleration feedback subwoofer. Mark that math is not avoided, but no one can present those formulas so clearly like Rob.

Mix and mastering engineer (and teacher and author of the impressive book “Mixen met Impact”) Wessel Oltheten is a long time LS1 user. He asked to test the new LS1s-dmf sub in his studio. Soon his comment arrived: "These subs are insane! It took me 30 seconds to decide I had to buy them. Authoritative, open, tight, life-like, in one word: wow!" 

Later he added: “These subs make it much easier to judge whether there is enough harmonic content in the bass. Many speakers give the impression your bass is warm enough, but you’re misguided by their distortion. If you then hear your mix on other speakers that don’t go that low, your mix sounds bleak. With the DMF sub I never run that risk again. Skipping through my portfolio, I can hear clearly why some of them worked wonderful outside the studio and some didn’t. I’m sure this tool will safe me from mistakes like that. And it works at low playback levels too! And as a bonus, the mid range is smoother and more detailed than ever, probably due to less masking. I could not ask for more.”


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  • Those subwoofers are pretty darned impressive. Thanks!

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

  • With the Grimm LS1 unexpected details appear in the recordings: nothing is hidden, and everything sounds delicious.

    Josep Armengol, Revista On Off, Madrid (LS1)

  • This is such an incredibly good speaker.

    Jaap Veenstra, Alpha Audio, Haarlem (LS1be)

  • Grimm's mission to eliminate the sound of the system and present just the original recording seems totally true.

    Josep Armengol, Revista On Off, Madrid (LS1)

  • I could always hear improvements in sound quality

    Marnix Bosman, Interface, Amsterdam (CC2)

  • It seems as if the musicians have more fun when they play music.

    Ingo Iebhart, hifi enthusiast, Eberdingen (CC1)

  • I was in the opportunity to hear your CC1 unit and I have to say INCREDIBLE!!

    Carlos Imperatori, Producciones Tumbador, Caracas (CC1)

  • Best sound of show, stunning, Meisterhaft.

    Theo Wubbolts, HVT magazine, Nijmegen (LS1)

  • After all these years I finally have a standard on which I can rely.

    Al Pryor, Mack Avenue records, Hempstead (LS1)

  • As it turns out, Truth equals Love.

    Timothy Roth, Positive Feedback (LS1)

  • The combination of Grimm Audio TPR with Neutrik EMC XLR's seems to me to be the non plus ultra at the moment.

    Günter Pauler, Stockfish Records, Northeim (TPR)

  • Its job is so critical that I’d never settle for less.

    Richard Chycki, Toronto (CC1)

  • I didn't know clock influence was that big!

    Tim Vine-Lott, Air studios, London (CC1)

  • Sensational! I have never found this quality in any commercial AD converter.

    Ronald Prent, Galaxy Studios, Mol (AD1)

  • From the first minute I knew that something very special was happening. (...) The quality surpasses everything I heard before on my system.

    Gerard Lombrez, Lille (CC1)

  • The LS1's frequency response is unusually flat - indeed the flattest we've ever measured.

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

  • The naturalness of the LS1 turns me on big time.

    Wolfram Eifert, AUDIOphile, Stuttgart (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.

    Christian Rechenbach, EinsNull magazin, Duisburg (LS1)

  • This is the first plug-n-play, all-in-one, system with true high-end sound.

    Marshall Nack, Positive Feedback (LS1)

  • The CC1 is a brilliantly designed piece of equipment. Every piece of gear that I plugged into it sounded better and more natural.

    Erik Zobler, Mix Magazine, Los Angeles (CC1)

  • 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)

  • 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)

  • Accurate, transparent and beautiful, that is the Grimm Audio LS1

    Jack Liu, AudioArt magazine, Taipei (LS1)

  • I was impressed by how my chain with the EMM's got a benefit when I added a Grimm clock to my setup. Guided by what the literature and many designers are saying I was stunned about the change in a positive way) in sound.

    Daniel Dettwiler, Idee und Klang Studio, Basel (CC1)

  • One for all and everything.

    Fritz Fey, Studio Magazin, Oberhausen (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.

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

  • Total peace of mind

    Marja Vanderloo & Henk Boot, 6Moons (LS1be)

  • Realize that not all timepieces are created equally. In this regard, the Grimm CC1 has no peer.

    Bob Katz and Garrett Haines, TapeOp, Sacramanto (CC1)

  • A world class machine!

    Yasushi Hamase, Be-Tone Studio, Kanagawa-Ken (AD1)

  • A great new day here with a relaxed and very detailed sound in the monitors and between all analog gear.

    Hudson Fair, Atelier HudSonic, Chicago (TPR)

  • The sound stage renders almost holographic with a very high precision and spaciousness, as if there is no cable at all.

    Harro Tillema, Alpha Audio, The Netherlands (TPR)

  • 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 (LS1)

  • 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)

  • I was focusing more on the music than the equipment, something that rarely happens when I listen to digital...

    Tony Bolton, Hi-fi World, London (CC1)

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

    Marja Vanderloo & Henk Boot, 6Moons (LS1)

  • The jury could only applaud.

    Joachim Pfeiffer, Audio Flatscreen Journal, Wuppertal (LS1be)

  • The AD1 made the most realistic recording of my piano that I have ever heard. Incredibly realistic and involving.

    Mark Conese, Ambient Records, Stamford (AD1)

  • The reviews I read are good, but to me what I experienced in our system was greater.

    Aaron Gandia, Phat Planet Studios, Orlando (CC1)

  • 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)

  • 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)

  • Among all the truly excellent SACDs from Channel Classics, the very best sound quality wise is the Mahler 4th recorded with the Grimm IMHO.

    Chris Fredriksson, HiFi enthusiast, Sweden (AD1)

  • I'm in tears, listening to my own recordings.

    Ben Zijlstra, Dutch Film & Television Academy, Amsterdam (CC1)

  • My new studio is wired with TPR

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

  • I've played everything from Rammstein to chamber music on these speakers, and they eat everything raw.

    Roy Ervin Solstad, Stereo+, Oslo (LS1)

  • I'm not the 'Ahhh & Ohhh' type of guy when it comes to subtle differences, but the difference this makes is so clear.

    Audioenzo, Dordrecht (TPR)

  • I had that feeling of an open window into sound, across a wide range of music styles.

    Nigel Palmer, Audio Media, London (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.

    Steven Maes, Motor Music, Mechelen (LS1)

  • My audition of the LS1 was a transformative experience.

    George Massenburg, McGill University, Montreal (LS1)

  • Very impressive.

    Steve Hall, Future Disc, Los Angeles (AD1)

  • 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)

  • The Grimm DSD and Channel Classics have captured a perfect balance between energy, liveliness and comfortable sound.

    Teresa Goodwin, Positive Feedback (AD1)

  • The CC1 brings out a level of detail and clarity that I had dismissed as only possible with analog.

    John Davis, The Bunker Studio, New York (CC1)

  • Did Grimm Audio reinvent the loudspeaker?

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

  • TPR outperforms all the others providing an impressive stereo image and a stunningly accurate phantom center.

    Philip Opdebeeck, Little Major Mastering, Antwerp (TPR)

  • This week we used the MP1’s with the M50s of my colleague. We were both astonished.

    Noah Scot Snyder, Los Angeles (MP1)

  • Suddenly and distinctly, there's a palpable increase in naturalness, extension and spaciousness.

    Nicholas Bedworth, Positive Feedback, Makawao (CC1)

  • This is a revelation. It is the first time in my 20 years of digital recording that I hear a fundamental improvement in sound quality.

    Leo de Klerk, Bloomline Studio, 's Gravendeel (AD1)

  • Wow, what a difference...!

    Ronald Wanders, hifi enthusiast, Zeewolde (TPM)

  • 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)

  • I'm now using a DSD converter called a GRIMM for my SACD mastering. Big improvement.

    Steve Hoffman, Audio Fidelity, Los Angeles (AD1)

  • I’ve rewired my studio with TPR cable and I now bring some with me to recording sessions as well. It is extraordinary cable.

    Noah Scot Snyder, Los Angeles (TPR)

  • I could not be more impressed.

    George Massenburg, McGill University, Montreal (LS1)

  • A signal that sounds pretty decent with a good clock, sounds just incredible with the Grimm Clock.

    Hay Zeelen, Hay Zeelen Mastering, Amsterdam (CC1)

  • 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)

  • A facility is as good as its weakest link and by using TPR the cables are not a weak link anymore.

    Ronald Prent, Wisseloord Studios, Hilversum (TPR)

  • I love your cable because it is effectively inaudible. With TPR, cable quality is no issue anymore.

    Jan Didden, Linear Audio, Turnhout (TPR)

  • We are very impressed by the quality of this unit.

    Günther Pauler, Pauler Acoustics, Northeim (CC1)

  • I LOVE the clean transfer of your TPR cable. It´s like there´s no cable at all.

    George Tanderø, Mixing & Mastering, Oslo (TPR)

  • 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)

  • I love the speed, transparency and neutrality of this cable.

    Marnix Bosman, HVT, Nijmegen (TPM)

  • Truly, this could be the last system you'll ever buy; an endgame solution.

    Marja Vanderloo & Henk Boot, 6Moons (LS1be)

  • My most impressive upgrade so far!

    Puck Leek, Pucksound, Amsterdam (CC2)

  • Truly a remarkable system, the equal or better of anything I've ever heard.

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

  • I had a client ask why my mixes were so much better this week.

    John Davis, The Bunker Studio, New York (CC1)

  • The sound of Grimm recorded SACD's is AMAZING, it totally closes the gap between analog and digital.

    Hiro, Pure Super Audio (AD1)

  • Grimm Audio enriches the Loudness Movement with exceptionally price worthy and designful tools.

    Dieter Kahlen, Studio Magazin, Oberhausen (LevelView)

  • Last week I was recording a strings section and piano. My client was very happy and he asked me if I changed something in the studio. Of course, it was your CC1.

    Josep Umbria, Calma Estudis, Manacor (CC1)

  • I buy and sell a lot of stuff, but the CC1 is not leaving the building.

    Alex Abrash, AA Mastering, New York (CC1)

  • This clock is incredible. The detail and imaging from it are superior to anything we heard.

    Allen Farmelo, Pink Noise magazine, Hopewell Junction (CC1)

  • I was thrilled with your power supplies for my Neumann M50's. We used those mics for an upcoming Chandos release of the Kansas City Chorus, and they were stunning.

    John Newton, Soundmirror, Boston (MP1)

  • 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)

  • This is a larger improvement than I expected. The sound actually gains quality in all aspects.

    Marnix Bosman, HVT magazine, Baarn (CC1)

  • 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)

  • LevelView is a fascinating loudness metering system that is hard to go without once you try it.

    Tommy Zai, KVR, Phoenix (LevelView)

  • A fantastic experience to work with this device.

    Hein Dekker, producer for Channel Classics, Baarn (AD1)

  • 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)

  • Throughout even the most turbulent passages the recording space stays luxuriously illuminated and the soundstage remains absolutely clear.

    Reinhold Martin, Hifi Statement Net Magazine, Gröbenzell (CC1)

  • 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)

  • I have used all high end AD converters known to date. Every one of them had a sound to it. Your converter doesn't: it is completely transparant!

    René Gambini, Lyrinx, Marseille (AD1)

  • During our sessions with Grammy winning saxophonist Kenny Garrett, the CC1 made all the difference in the world!

    Al Pryor & Todd Whitelock, Mack Avenue records, Hempstead (CC1)

  • Not something good, but something already exquisite has further been improved.

    Fritz Fey, Studio Magazin, Oberhausen (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 !

    Dimitris Stamatakos, AVMentor, Athens (LS1)

  • This is a major improvement. We need much less eq on the high end, the low end sounds more solid and the punch on the snare is great. This clock is a large improvement, we were amazed.

    Peter Riebeek, Studio 150, Amsterdam (CC1)

  • You must hear that! Absolutely!

    Fritz Fey, Studio Magazin, Oberhausen (LS1be)

  • Their natural sound and their unimposing, deep trueness kept overwhelming me and my colleagues.

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

  • 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)

  • I did some sessions in 44.1, 48 and 96. It works great, and sounds fantastic. The CC1 is such a great upgrade in the studio, amazing!

    Samuel Girardin, Point d'Orgue, Montreal (CC1)

  • I had expected a small sound improvement. What happened is just the opposite: I am very impressed.

    Gerd Hoppe, hifi enthusiast, Alicante (CC1)

  • I switch over to Grimm TPR tomorrow. After extensive testing I could not find a better alternative. This cable gets so close to the original it's frightening.

    Mark den Hartog, Zownd Mastering, Leiderdorp (TPR)

  • After installing your CC1, I often catch myself thinking that I listen to 88.2 when in reality it is 44.1. Their difference used to be much larger, and both sound much better now.

    Reyn Ouwehand, Studio The Church, Wijdenes (CC1)

  • The jitter measurement results of the CC1 were the best of all competitors.

    Friedemann Kootz, Studio Magazin, Oberhausen (CC1)

  • 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)

  • I won't get my monitoring better than this. Mastering party all day, every day!

    Frederik DeJongh, Jerboa Mastering, Gent (LS1)

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