From Nature to Speakers: Dr. Oskar Heil’s Air Motion Transformer
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- เผยแพร่เมื่อ 16 ก.ย. 2024
- Dive into the fascinating history of the Heil Air Motion Transformer, the groundbreaking audio innovation by Dr. Oskar Heil that emulated natural movements to deliver unparalleled sound quality.
Discover how this revolutionary design rocked the audio world and became a staple in high-end speakers globally.
We’ll explore the evolution of the Air Motion Transformer from its inception to its modern-day refinement by Beyma, which perfected the design with the world’s largest and most powerful AMT, the Beyma TPL-150H.
See why this technology remains a favorite among audiophiles and continues to set the standard in speaker performance worldwide.
Heil Air Motion Transformer, Dr. Oskar Heil, Beyma TPL-150H, audio innovation, speaker technology, audiophile speakers, Air Motion Transformer history, high-end audio, sound revolution, Beyma AMT, AMT drivers.
#AirMotionTransformer #HeilAMT #DrOskarHeil #BeymaTPL150H #AudioInnovation #SpeakerTechnology #HighEndAudio #AudiophileSpeakers #SoundRevolution #AMTDrivers #BeymaAudio
The AMT-1Bs. I heard sounded excellent. They had great depth of field.
These are top , nice presentation....
Glad you like them!
I have the Beyma TPL 150H in my speakers. Achenbach SON XL high end version. I can confirm those are the best tweeters I've ever owned! So much fun to listen to in low and high volume ❤
Thanks for sharing
I have often wondered about the operating principle of AMTs. Thanks for your clear explanation.
Mr Heil, was quite the innovator, especially in the P.A. world.
Glad it was helpful!
The original Heil AMT can be greatly improved upon from it's edge diffraction. I had some 3 inch round foam rubber pipe insulation laying around so I trimmed it to mate with the edge of the plastic housing where the sound projects out on the edges. Instead of that sharp edge of the plastic housing the trimmed piece of round foam on each side smooths the edge diffraction and also it prevents the wrap around of certain frequencies from the rear of the Heil that cancels out certain frequency. When I first applied the round foam I was stunned and couldn't believe the difference. I have not tested it with equipment but it sounded so much better just by ear. If I can experiment more and find the optimum size roundover I will make something permanent with a 3D printer. The speaker became much more holographic and dimensional with the round foam applied, it seemed the highs were all around the speaker but not coming directly from the speaker itself. More depth and dimension behind the speaker and the speaker seemed to have more impact to the sound, I was blown away and had this huge smile on my face, it's amazing the change it made.
Sometimes its the little things that matter the most. In our next video we film the results of an experiment in Quantum Physics as we test the "Counter Space Modules" provided to us by a interesting gentleman in Tuscon... or is it...beyond?
@@shinjitsuaudio one other thing I forgot to add, I also added that round foam rubber at the rear of the cabinet where the rear wave of the Heil exits off the back edge of the cabinet. It's a 90 degree edge so that smooths the edge diffraction at the rear wave of the Heil as well. I cut the round foam rubber in half so that it mates up with the cabinet edge perfectly and rounds it over. It contributes to the improved sound as well, I noticed a difference after I applied it. The sound is just so much more refined and smoother sounding after taking care of those edge diffractions, both from the tweeter housing and the rear cabinet edge. The speaker model is the ESS AMT-1B. I have two other different models of ESS speakers that I'm going to apply the edge diffraction treatment to.
Great information. Lots of great feedback on filming upgrades too... thanks for the video
Glad it was helpful!
They work great crossover @ 2300hz and fast midrange drivers are tough to beat with tight subwoofer, I built several models all good
Thanks for the info
any sales link? thanks
Another amazing video, question, putting price to one side, would you choose the ESS over the Beyma? Or vice versa!
We have chosen the Beyma. The Heil ESS are a bit dated in technology IMO, have weaker magnets (ferrite vs Neodymium) and the membrane does not employ kapton. Ive heard both.
@@shinjitsuaudio thank you so much for your insight 👍
@@shinjitsuaudio Beyma tweeters are stunning! Are you using metal or silk domes?
Good morning ❤
Superb hf transducer. Only transducer I know of which moves perpendicular to the listener. Unfortunately many of the mass produced units have extremely weak magnetic force which limits their output significantly.
Agreed. Best we have tested by far. But with that said they are very expensive at $600 a piece.
Bought the AMT-1, "Sound as clear as light", in April 1975. The crossover utilized imposed sibilance on the transducer. Also prone to thermal runaway, where the diaphragm would melt. My last commercial built, the B&W DM 6, far superior midrange and not as bright, but more musical highs.
Been building my own since 1980. Currently employing the Speakerlab Auricle RD 57, a 2 inch wide, 54 inch long, push pull, dipole, planar magnetic. With (2)Morel 164's/channel, each in 13 foot long waveguides. That's for video sound. Also employing the Raal 140-15D, Lowther DX 65, and (2) Jordan JX 150 NG's also in 13 foot long waveguides, powered by OTLs, for music reproduction.
Very nice speakers by the sound of it.
Nice! Thanks for sharing.
Such an informative video! How do your rate Mundorff's AMT? Some speaker companies use is but have Mundorff specially customize it to their specifications. Thank you.
Hello!
We explored the Mundorf line of AMT's and chose the Beyma.
Here is why we chose the Beyma TPL150H:
Choosing Between Mundorf AMT and Beyma TPL-150H:
For Highest Sensitivity and Dynamic Range: The Beyma TPL-150H is the better choice if you need high sensitivity and are matching with other high-efficiency drivers. Its dynamic capabilities and efficiency make it ideal for large rooms or setups where minimal amplifier power is preferred.
For Ultra-High-Frequency Extension and Smoothness: The Mundorf AMT excels with its superior high-frequency extension and smooth, natural sound. It’s a great option if you prioritize the absolute highest clarity and detail in the treble region, particularly for critical listening setups.
Dispersion Needs: If controlled dispersion is a priority, the Beyma TPL-150H’s horn design can offer more predictable and focused sound coverage, which can be beneficial in managing room reflections. Conversely, if you desire a broader sound dispersion with a larger sweet spot, the Mundorf AMT might be preferable, despite its narrower vertical coverage.
Integration with Other Drivers: Consider how you choice of how either driver will integrate with your chosen midrange or woofer. The Beyma’s horn loading might pair more seamlessly with other high efficiency extended range driver such as the Mark Audio line with the ultra thin magnesium aluminum cones in maintaining a consistent sound signature across the frequency range. That is precisely why we chose the Beyma.
Our choice of the Beyma TPL-150H over the Mundorf AMT for pairing with the Mark Audio foil main drivers reflects a strategic decision to optimize for efficiency, dynamic range, and controlled dispersion, all while maintaining a balanced and engaging sound profile.
The studio has a high "I am being kidnapped and forced to make this recording at gunpoint" vibe 😂 I love that, but if you want, setting a light a little warmer would fix that I think. And turn the light down a bit, the shadow behind you is brutal, it makes you shine though 😂
Keep up the great work, I am thinking of using a pair of these with some open baffle woofers at a crossover between 900 an 1300 hz. Maybe put an optional full range electrostat in the middle 😂
I love that a set of two is priced at 230$ including montage kit. While a single one is also priced at $230. So if you want to build a center speaker you have one in reserve 😂
The ess is dipole, the beyma isn't, correct? Or can the beyma backplate be removed? Does the beyma have the same range?
That's incredibly funny! How did you know I had my feet tied up?
The ESS is a dipole. The back plate can be removed but why? I find dipoles to be difficult to position for good imaging.
@@shinjitsuaudio it was the look in your eyes for sure 🤣
@@shinjitsuaudio I was talking about the beyma. Can the backplate be removed to make that dipole too?
I have (and have had since 1987) multiple sets of electrostats I wanna play with. And would like it to stay dipole all the way. Looking into open baffle bass as well.
Think I will go for the ess, bit easier to justify for tinkering 😁 besides they must be able to fit nicely into a two way if/when I am done
Damn I was scared but now we have changed cameras away from Apple 1Phone 15 and now to the Sony A7III. See the results in our next video in which we film the results of an experiment in Quantum Physics. We test the "Counter Space Modules" provided to us by a interesting gentleman in Tuscon... or is it...beyond?
An engeneer tested the beyma , and to be in fase with some 6" mids thehorn was too deep , so hemade a shorter horn , the best was 40mm deep ...
An engineer? who was that? "phase".
Do you have a reference for the engineers opinion or text to share?
I think you are saying the time alignment was out, with proper DSP no problem these days and with that you maintain the appropriate horn design for dispersion control, or even simpler mount the 6“ 20mm deeper which should be easy enough
Also I am looking for a nice/good active crossover to start experimenting (see my other comment that I cant edit anymore, thnx yt) a 2 way could do a 2&3 way would be perfect. Hoping for something under €300. Expecting it to cost more. Any suggestions?
Well..we do not entertain active crossovers as we are pure and simple people.
@@shinjitsuaudio I envy that, I lost my purity at 15. And to be simple just sounds blissful 😁
Are you going to call this speaker combination, The MAC Daddy & will it be added to your product line?
We are adding it to our product line yes.
Yes - But the ESS goes down to 700Hz - So how much difference in clarity? Plus, the new Pure Audio Projects use the ESS. So, for the difference in price between the Beyma and $250 for a pair of ESS, is the difference that negligible? - Not trying to challenge, but trying to figure out for me - when listening to Pink Floyd 'Welcome to Machine', is the extra cost of the Beyma worthwhile? Thanks
$250 for one, not a pair.
Thank you for your thoughtful question! It's great that you're diving deep into understanding the differences between the Beyma TPL-150H AMT and the Great Heil ESS, especially when considering music that demands clarity and detail like Pink Floyd’s "Welcome to the Machine."
Clarity and Frequency Response:
Beyma TPL-150H: The Beyma is known for its outstanding clarity, extremely low distortion, and smooth frequency response. While it typically operates well from 1.5 kHz and above, its performance in the upper midrange and treble regions is exceptional, making it a popular choice for high-end systems where detail and transparency are critical.
ESS Great Heil AMT: The Great Heil AMT is designed to extend lower, down to around 700 Hz, which is advantageous for broader frequency coverage, particularly in simpler two-way setups. However, operating closer to the lower end of its range might introduce some compromises in clarity, especially under high SPLs or complex musical passages.
Differences in Performance:
Clarity and Detail: The Beyma TPL-150H is engineered with advanced materials and design refinements that contribute to superior detail retrieval, especially in the high-frequency spectrum. This can be particularly noticeable in complex music with layered high-frequency content, such as cymbals, synthesizers, and nuanced vocals.
Integration with Woofers: The ESS Great Heil, with its lower crossover potential, can integrate seamlessly with larger woofers that play into the midrange. However, this often means sacrificing some of the high frequency refinement that the Beyma can deliver.
Cost vs. Performance:
Price Consideration: The ESS units are more budget-friendly, and for many, they offer a very good performance-to-price ratio. If you're satisfied with the level of detail and frequency response they provide, they can be an excellent value.
Beyma Justification: The Beyma TPL-150H, while more expensive, brings a higher level of refinement, especially in demanding audio scenarios. For audiophiles who are keen on extracting every bit of detail from recordings like Pink Floyd's, the investment in Beyma might be worthwhile. It’s designed to handle complex audio material with greater finesse, potentially offering a more immersive and detailed listening experience.
Listening Preferences and Application:
If your priority is maximum detail and you're using high-quality recordings, the Beyma could indeed offer a noticeable improvement, particularly in the highs where it excels.
If your setup or personal taste leans towards a more full-bodied integration that the ESS provides at a lower cost, then the Great Heil might suit your needs without a significant compromise.
Ultimately, the decision hinges on your specific listening preferences, system integration, and how much value you place on the incremental improvements in clarity and detail that the Beyma offers over the ESS. Both have their strengths, and understanding where those align with your audio goals will guide the best choice for your setup.
I have heard and tested both. The Beyma is in a league of its own.
Beyma for sure.PAP needs to hit a price point