2-Way Stand Mount Loudspeaker

Lyra is a unique 2 way speaker system. It features a new breed of high frequency driver loaded with a very special horn system, complimented by 2 magnesium diaphragm mid/bass drivers in an all aluminium ported enclosure.

Loudspeakers are the final component in the reproduction chain. You will hear all kinds of opinions on the importance of loudspeakers in the replay chain pitched by gurus around the globe. Most leaning to the fact that loudspeakers don’t measure very well. They all have considerably high harmonic distortion, limited bandwidth and frequency nonlinearity. Those are the parameters that are easily measured even by amateurs. Other, just as important parameters, are directivity, stored energy, time alignment, those are discussed by connoisseurs and by marketing people and require a higher level of equipment and knowledge to identify. Things like signal to noise (yes speakers have signal to noise!), break up behaviour, diffraction interference and others are discussed only among people with true experience and understanding. To measure those you need special jigs and equipment that is usually purpose built.

Listing all those shortcomings in a speaker would make you wonder how does it even work and yet when you are comparing 2 DACs with 100 times better specification and measured performance on the obviously imperfect speakers you can clearly hear the difference between the DACs. All arguments that speakers have the most audible artefacts of all components in the signal chain are true, but it does not make the faults of the supply chain go away. The speaker induced artefacts are of a different character. Being simple devices the computer models used to predict their behaviour are quite accurate. Very often to simplify description the more complex behaviour is generalised and many things are assumed. In those assumptions the errors start to accumulate until they prevail and the predicted result differs significantly from the measured or intended.


Main feature of the speaker system is a solid aluminium carved front panel incorporating a horn with specific directivity and frequency response as to perfectly match the directivity of the adjacent woofers. The gemetry of the front plate is such that it is time aligned between the tweeter and woofers. We use a custom designed ring diaphragm compression driver. The driver features a 118dB/watt sensitivity and a very low resonance allowing us to use it effectively to below 1500Hz. This driver/horn implementation allows for very high levels and low distortion as well as very very low spurious noises. The magnesium diaphragm woofers are able to match the speed and clarity of the tweeter at the expense of a very nasty break-up mode in the upper midrange, so utmost care has been taken to make sure this resonance never gets exited, so the 3rd order crossover is 3 times lower then the nasty resonance.

The speaker system features an uncommonly high sensitivity of 90db making it usable with lower power amplifiers or in very big rooms while bass extension is generous considering the size of the speaker and it’s efficiency. It sustains severe levels of abuse without giving in. The filters are constructed with resonance free foil wound inductors and premium Polypropylene capacitors. The all aluminium body is internally damped for any internal vibration and resonance. Styled in the Thrax family of products. The value of our speakers is in the knowledge required to make them not the materials used. It is time precious materials loose their mythical properties in audio. Diamonds and silver are more expensive, so they must be better is the general asumption. (I really doubt, gold teeth are still going in dentistry). Aluminium has 2 times lower resistance per unit weight for voice coils compared to silver or copper.
If we talk speed this is it.

As said music is sounds and silence. Everyone tries to improve the sound and we just improve the silence.

Wasn’t Thrax an electronics company? What do you know about speakers? 28 years ago I designed and built my first speaker. Even then with a ribbon tweeter (by Decca) and with an Alnico magnet bass unit. Needles to say it did not sound that good. Main reason was …It was designed by the book. No thinking involved. Following the rules gets you a mediocre (average) result.

During my studies at the Danish Technical University in Copenhagen on the subject of acoustics, coincidence introduced me to a character called Steen Deulund and then I found I know nothing.
A number of books later I regained enough confidence to point at a good or a bad design. Than I found out how little people know about good speaker design and certainly could identify a good one.
Leap forward 20 years to an argument in Sofia about tweeters used in high end speakers and which sounds better accompanied by demonstrations and piles of marketing bla bla. Until an older gentleman comes to me and said “you should hear what Plamen has done”. Never payed much attention to this as Plamen has been doing cinemas and studios for as long as I can remember but. Then again curiosity prevailed. A quick listen to a prototype set of speakers using a ring diaphragm compression driver loaded with 2” short (that is very short) horn. Was a smack in the face.


The experience was backed by very thorough paper written on the subject of intermodulation products of tweeters and sub harmonic distortion acting as contaminants to the background and reducing signal to noise of the speaker system. Apart from the usual break up modes there was excursion induced nonlinearities, cavity resonances, magnetic modulation, diffraction and other subjects covered.

But the proof of the pudding is in the eating. So building a speaker system as a showcase for this technology seemed the logical next step. Beware!


  • Impedance: 4Ω
  • Max Power Handling: 250W
  • Dimensions: 210W x 385D x 520H mm
  • Weight: 35Kg
  • Finish: Black or Silver anodized aluminum
  • Sensitivity: 90db
  • Frequency band: 34~20 000Hz