LMH

High-Efficiency Horn Loudspeakers
Built Without Compromise

Individually built horn loudspeaker systems and components.

For listeners with a demand for acoustic authenticity and craftsmanship-level substance

Designed, manufactured and tuned in our own workshop in Germany.

Request consultation or listening session

No obligation. Personal. No sales pressure.

Which system fits my room?

Briefly explained.

Musical authenticity

Loudspeaker systems for real dynamics

Individual development & manufacturing

Manufactory craftsmanship & bespoke solutions

Long-term satisfaction

Heyder — committed by name

For more than fifteen years, LMH has been developing, manufacturing, and refining horn loudspeaker systems, loudspeakers, and precision CNC components — guided by acoustic logic, technical consistency, and a deeply rooted commitment to craftsmanship.

Our products are created with an uncompromising focus on structural integrity, mechanical stability, and long-term durability.
Not as short-lived objects, but as systems designed for lasting performance.

Controlled directivity, high efficiency, and precise impulse reproduction define our work.
Developed for real listening rooms — not for measurement charts alone, but for long-term listening satisfaction.

„A reference-class achievement — both sonically and in craftsmanship.”
— HiFi Test

Complete Speaker Systems

Independent loudspeaker systems
from Lautsprechermanufaktur Heyder.

The N° Series represents modern horn systems
with a clear acoustic stance.

The Classics Series stands for proven concepts
reinterpreted with appropriate materials and contemporary execution.

Horns & Waveguides

CNC-machined horns, waveguides,
and acoustic components primarily made from solid wood.

Developed for reproducible geometries,
defined sound guidance,
and clean system integration.

Built to last.

Manufactory & CNC

What is created here follows no industrial standard.
Every component is part of a considered process
in which development, craftsmanship, and CNC precision work together.

This is how we realize individual loudspeaker projects
as well as precise CNC components for developers, manufactories,
and demanding one-off productions.

Experience the N° Series

Discover the Classics Series

Explore Horns & Waveguides

Discuss an individual project

THE MANUFACTORY

Development & Manufacturing

LMH combines acoustic development, over 25 years of craftsmanship, and modern CNC manufacturing under one roof.
From classic horn profiles and multi-entry concepts to fully integrated loudspeaker systems, LMH develops solutions based on clear technical logic and reproducible quality.

Each system is engineered as a whole, verified through measurement, and voiced with care — not assembled from off-the-shelf modules, but developed as an integrated design.

Under one roof.

Manufacturing takes place in our own facility in Germany.
Solid woods, precise CNC machining, and controlled production processes ensure mechanical stability, defined acoustic conditions, and consistently high quality.

In addition to our own loudspeaker series, we also realize individual manufacturing and development projects — from one-off builds to small series, for clients and partners with clear technical requirements.

LMH stands for substance over marketing, for transparent engineering, and for products built to last.
Our loudspeakers are not designed to impress at first glance, but to convince over time — with composure, dynamics, and musical coherence.

BM Magazin:

"Built from hundreds of thin veneer layers and precisely shaped, these horns resemble the sculptures of an artist rather than conventional high-end audio products.
The horns from Jens Heyder’s small but highly focused loudspeaker manufactory in Stuttgart rank among the finest currently available on the market."

https://www.bm-online.de/inspiration/blick-ueber-den-tellerrand/klangwunder

⭐⭐⭐⭐⭐
„I’ve heard a lot and built many loudspeakers myself, but Jens Heyder’s presentation genuinely blew me away.“...

„I’ve heard a lot and built many loudspeakers myself, but Jens Heyder’s presentation genuinely blew me away.
Outstanding sound and immaculate craftsmanship without a single flaw. It’s hard to imagine achieving this level of musical enjoyment any better — or at a more reasonable price.

I’m happy to be proven wrong, but to me this manufactory represents the very top of what is technically achievable.
The consultation is simply invaluable. The final result as well. It doesn’t get any better.

(I was not compensated for these words — they reflect my own honest conviction.)”

— KaPe, certified expert, Hamburg
Google review · published with the author’s permission

⭐⭐⭐⭐⭐
„Ich kann Jens uneingeschränkt empfehlen – ein echter professioneller Handwerkskünstler.“...

Wow!

„Ich benötigte ein Mittel-/Hochton-Horn für mein Open-Baffle-Lautsprecherprojekt mit einem Radian 745Neo Kompressionstreiber. Die Trennung erfolgt bei 1,5 kHz, mit offenem, sauberem Hochtonbereich.

Ich war zunächst skeptisch, da viele Hörner, die ich kenne, zu einem aufdringlichen Klangbild oder zu einem sogenannten ‚hohle-Hände-Effekt‘ neigen. Diese Sorge war völlig unbegründet.
Jens entwarf für mich ein 34 cm rundes Horn aus Birkenmultiplex, das nicht nur hervorragend aussieht, sondern auch klanglich absolut überzeugt – ich bin mit seiner Arbeit äußerst zufrieden.

Der Klang ist schnell, linear und realistisch, sehr natürlich. Es gibt einige Dinge, die nur ein Hornlautsprecher leisten kann, und ich kann anderen nur empfehlen, sich darauf einzulassen.
Ich kann Jens uneingeschränkt empfehlen – ein echter professioneller Handwerkskünstler.“

— Kaiti
Google-Bewertung · mit Erlaubnis des Autors verwendet

⭐⭐⭐⭐⭐
„“My goal was to have a truly complex loudspeaker built. That could only be achieved by someone working with CAD and driven by a perfectionist mindset — and in Jens I found exactly that person.“...

Demanding in design — convincing in execution

“My goal was to have a truly complex loudspeaker built. That could only be achieved by someone working with CAD and driven by a perfectionist mindset — and in Jens I found exactly that person.

Communication was excellent, and the planning process exemplary.
The only downside: the estimated build time was exceeded by several months — so patience is required.

The final result, however, exceeds all expectations.
I would gladly do it again.”

— B. Semmler
Google review · published with the author’s permission

Hornspeakers?

Because music can be more than background.
Because a loudspeaker should not just play, but evoke something.

Our loudspeaker systems are the result of a consistent pursuit of perfection.
Not as an end in itself — but to experience music more freely, more vividly, and more intimately.
That is why we rely on horn systems.

A good loudspeaker makes music audible.
A very good loudspeaker makes it tangible.

Experience the difference.

Effortless Dynamics & Headroom

A well-designed horn does not sound strained.
It opens up dynamics without pressure.
Quiet passages gain depth, loud moments remain controlled.
Music feels more relaxed — yet at the same time more intense.

High Efficiency

Our horn loudspeakers do not require large power reserves to perform convincingly.
They play effortlessly, directly, and naturally —
even with low-power amplifiers and carefully matched tube designs.

Contemporary & Flexible

In combination with DSP system amplifiers, fully integrated and precisely tuned solutions are created.
Adaptable to room acoustics, listening distance, and personal preferences.
Straightforward in everyday use — uncompromising in ambition.

Carefully Selected Components

Each component used is either developed specifically for our applications or selected according to strict technical criteria.
Not based on datasheets alone, but on real-world behavior within the complete system.

Natural Reproduction

Targeted use of solid wood, high structural mass, and mechanically controlled designs minimize resonances.

The result is music with character —
free from coloration, free from strain,
encouraging extended and repeated listening.

LMH