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In a new white paper Bruno Putzeys shines his light on a topic that receives a lot of attention (almost 1 million hits on Google) but according to us is just deceiving when it comes to audio quality: atomic clocks.


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  • My most impressive upgrade so far!

    Puck Leek, Pucksound, Amsterdam (CC2)

  • 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)

  • My new studio is wired with TPR

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

  • You must hear that! Absolutely!

    Fritz Fey, Studio Magazin, Oberhausen (LS1be)

  • 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)

  • 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)

  • 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)

  • 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)

  • 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)

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

    Alex Abrash, AA Mastering, New York (CC1)

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

    Nicholas Bedworth, Positive Feedback, Makawao (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)

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

    Hay Zeelen, Hay Zeelen Mastering, Amsterdam (CC1)

  • 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)

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

    Roy Ervin Solstad, Stereo+, Oslo (LS1)

  • 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)

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

    Carlos Imperatori, Producciones Tumbador, Caracas (CC1)

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

    Hiro, Pure Super Audio (AD1)

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

    Frederik DeJongh, Jerboa Mastering, Gent (LS1)

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

    Marshall Nack, Positive Feedback (LS1)

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

    Ronald Prent, Galaxy Studios, Mol (AD1)

  • 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)

  • 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)

  • 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)

  • 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 could not be more impressed.

    George Massenburg, McGill University, Montreal (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.

    Christian Klotzbücher, Kunstuniversität Graz, Graz (LS1)

  • A world class machine!

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

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

    George Tanderø, Mixing & Mastering, Oslo (TPR)

  • One for all and everything.

    Fritz Fey, Studio Magazin, Oberhausen (LS1)

  • 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)

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

    Marnix Bosman, HVT, Nijmegen (TPM)

  • 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)

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

    Teresa Goodwin, Positive Feedback (AD1)

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

    Philip Opdebeeck, Little Major Mastering, Antwerp (TPR)

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

    Steve Hoffman, Audio Fidelity, Los Angeles (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)

  • Wow, what a difference...!

    Ronald Wanders, hifi enthusiast, Zeewolde (TPM)

  • 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)

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

    Ingo Iebhart, hifi enthusiast, Eberdingen (CC1)

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

    Marnix Bosman, HVT magazine, Baarn (CC1)

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

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

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

    Richard Chycki, Toronto (CC1)

  • 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)

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

    Marja Vanderloo & Henk Boot, 6Moons (LS1)

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

    Dieter Kahlen, Studio Magazin, Oberhausen (LevelView)

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

    Jack Liu, AudioArt magazine, Taipei (LS1)

  • As it turns out, Truth equals Love.

    Timothy Roth, Positive Feedback (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)

  • 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)

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

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

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

    Gerd Hoppe, hifi enthusiast, Alicante (CC1)

  • 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)

  • 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)

  • 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)

  • 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 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)

  • Best sound of show, stunning, Meisterhaft.

    Theo Wubbolts, HVT magazine, Nijmegen (LS1)

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

    Jan Didden, Linear Audio, Turnhout (TPR)

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

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

  • My audition of the LS1 was a transformative experience.

    George Massenburg, McGill University, Montreal (LS1)

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

    Marja Vanderloo & Henk Boot, 6Moons (LS1be)

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

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

  • 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'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)

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

    Al Pryor, Mack Avenue records, Hempstead (LS1)

  • 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)

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

    Nigel Palmer, Audio Media, London (LS1)

  • 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)

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

    Aaron Gandia, Phat Planet Studios, Orlando (CC1)

  • A fantastic experience to work with this device.

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

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

    Günther Pauler, Pauler Acoustics, Northeim (CC1)

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

    Wolfram Eifert, AUDIOphile, Stuttgart (LS1)

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

    Tommy Zai, KVR, Phoenix (LevelView)

  • 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)

  • 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)

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

    Fritz Fey, Studio Magazin, Oberhausen (LS1)

  • Total peace of mind

    Marja Vanderloo & Henk Boot, 6Moons (LS1be)

  • 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)

  • 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 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)

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

    Friedemann Kootz, Studio Magazin, Oberhausen (CC1)

  • 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 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)

  • 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)

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

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

  • 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)

  • 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)

  • Did Grimm Audio reinvent the loudspeaker?

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

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

    Keith Howard, Hi-Fi News, Croydon (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)

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