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Aries Cerat

Aries Cerat Symphonia Horn Speakers

Aries Cerat Symphonia Horn Speakers

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Regular price £67,495.00
Regular price Sale price £67,495.00
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When designed and implemented correctly, horns can attain a level of reproduction and dynamics unmatched by any other type of speaker

 "Years ago as a young audio enthusiast, I was fascinated with horn speaker technology, and quickly recognised the innate potential in their design. After a lot of reading and research of the physics involved I began to develop an appreciation of the prior art, while at the same time noticing how some contemporary horn designs had fundamental flaws that undermine the advantages and introduce additional problems. I wanted to take the concepts from the early horn era and push them further, taking advantage of the technology of today in terms of computing, simulation, CAD-CAM and manufacturing advancements, and use it to advance horn performance whilst retaining classic horn virtues and sonic performance."

The Symphonia is the result of an intensive five year research and development program in horn speaker engineering

The development of the Symphonia’s tweeter was spread over a three year period. I was always mesmerised by the sound of a true ribbon, especially Raal’s designs, but usually direct radiating ribbons lack the punch and dynamics of a high-frequency compression driver. On the other hand, no compression driver could ever deliver the detail, accuracy and bandwidth of a true ribbon transducer. So we began research on whether it was possible to combine the two approaches to get the best of both worlds.

A normal ribbon is not designed to operate at high acoustic pressures typically present at the throat of a horn. It soon became clear a special ribbon would need to be designed. After modification and experimentation on the Raal tweeter, we found the end result to more than meet our expectations. However, horn loading the ribbon still presented challenges. We were reluctant to use conventional solutions such as wave guides or directivity control apparatuses that would be inadequate for the task, so we endeavoured to find a new approach.

This lead us to design a horn flare that specifically loaded the ribbon as a true horn. Nevertheless, the line source emission characteristic of the ribbon made this extremely difficult. Diffraction is secondary sound emission, and takes place in geometric anomalies, transitions of geometry and changes in curvature. It’s very much audible and almost impossible to eliminate. In horns, diffraction is present at the horn termination for round horns. In rectangular horns the problem is more pronounced.

 The solution was the implementation of our diffraction-less 360 degree horn technology. We designed the horn flare to expand to 360 degrees, while maintaining the flare curve’s second derivative constant, keeping the curvature slope constant. Precise measurements were made of each iteration in an attempt to match the simulation and theory to its real-world acoustic performance.

We found variations of just 0.2mm to have detrimental effects on the horn’s performance. Manufacturing them to specs from wood was also challenging. In the end, a total of fifteen different flares were designed, built, measured and eventually discarded before we settled on the final design that performed as we wanted.

The ribbon horn combination response is shaped to measure flat from 3KHz upwards. It delivers detail and resolution associated with only the very best ribbons, with the solid punch and dynamics of the very best high frequency compression drivers. Distortion characteristics at 114db are lower that those of the best dome tweeters at 95db. What’s more, the diffraction-less nature of the horn enclosure gives the tweeter unmatched time domain performance.

We believe that bass delivered from horn loaded drivers are unmatched in performance, as long as the horn in properly designed. Folded horns suffer from three major factors:

Usually to short in length for the bandwidth used. Shorter horns and small mouth-area bass-horns, have large frequency response ripples, and strong coloration.

The horn is often not folded correctly, the horn flare is formed by conical sections of wooden sheets, with sharp angles and many parallel surfaces, trying to resemble something like a true horn flare.
Horns and bass horns in particular, submit their internal walls to extreme pressures. Plain sheets of wood are just not appropriate for this task.
The Bass horn used is a 3.3m long horn with very large mouth area for the bandwidth used, providing excellent performance in bass extension and weight, with the lowest coloration than any other folded horn.

The horn flare, is a true tractrix flare, formed by stacked sheets of plywood, carved to formed a true 3.3m long tractrix horn, properly folded without any internal sharp angles and geometrical deviation from a the tractrix flare.

The stacked plywood construction, provides 10 times the stiffness (along the horn axis), compared to conical horns formed by sheets of wood, also constructed with much reduced weight/stiffness ratio, providing minimum energy storage.


The external crossover, consists of three constant group delay filters. A constant group delay filter, is our own proprietary design, which alters the attenuation slopes of the driver filters, to shape the phase (and doing so the group delay) in such a way as to provide maximum group delay linearity.

Using this specific filter technology to the physically time aligned horns, the Symphonia speaker present time domain performance which is near perfect, and a frequency response with a maximum deviation of +-0.5db (250Hz-20KHz).







High frequency transducer:

RAAL Ribbon tweeter with modifications. Housed in a 360° flare. CNC machined solid wood housing. Lateral adjustment.

Midrange Horn Unit:

4 inch compression driver horn, oversized magnets and mounted on a custom throat. Horn enclosure CNC machined in solid plywood.

Bass Unit:

Tractrix horn loaded enclosure made of dense plywood sheets. Custom internal 3.3 metre horn exiting to a large mouth.


Custom built 3 way constant group delay filters with time domain technology and filtering. Adjustable gain for the 3 way for room tuning.



Frequency response:

(-3db) 32Hz~100Khz

+-0.5db at 250Hz-20KHz


170 kilos per channel

Overall dimensions:

930mm W X 1400mm H X 880mm D

Paint finishes Aeris version:

Black with Bronze Metalic for the horns.

Wood veneer for the bass unit sides.
Crossover finish to match.

Paint finishes Custom Aeris version:

Liquid Copper finish for the horns.
Wood veneer for the bass unit sides.

Crossover finish to match.

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Aries Cerat Symphonia Horn Speakers
Aries Cerat Symphonia Horn Speakers

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Aries Cerat Symphonia Horn Speakers
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Delivery & Returns

Delivery & Returns

We offer FREE delivery to the mainland UK (excluding Channel Islands, Isle of Man, Isle of White, Isles of Scilly, and some of the remote Scottish Isles).

For other areas please contact us for a quote. Select items can be delivered internationally by prior agreement. Again please contact us for a quote. We will always do our best to help.

Our aim is to dispatch goods within 2 working days of an order being placed. Please allow 5 working days from the time of your order to receipt of item. If an order is expected to take longer than this our order fulfillment department will contact you to inform you of this.

Where multiple items are ordered, we will dispatch them all in one package. If you have ordered any special or customized items, or items otherwise not immediately available, we will dispatch the order when all items are available. If you have any concerns regarding this, please contact us and we will do are very best to help you.