Datasheet and tolerances

 All loudspeakers frequency responses are measured at 0.3 m/2.83 V in IEC baffle and normalized to 1 m with 1/12 oct. smoothing. Frequency response displayed in the datasheet is an average frequency response only. Particular frequency response can alter in +/-1,5 db.

 All loudspeakers impedance responses and T/S parameters are measured at 20mV in free field. Impedance response displayed in the datasheet is an average impedance response only. Particular impedance response can alter in +/-10%.

 Following specifications: Nominal impedance, Sensitivity 2.83V/1m, Moving mass, Force factor, Resonance frequency, Mechanical Q factor, Electrical Q factor, Total Q factor, Magnetic flux density, Voice coil inductance and DC resistance are given with +/-10% tolerance.



We are giving 5 years warranty on our speaker drivers. It does not include:

Burned voice coils

Broken membranes

Damaged mechanical parts and/or loudspeaker malfunction caused by external impact


 Please note: our drivers are made for the indoor use only and are not designed and/or tested in automotive, marine, outdoor or other environments.  We do not guaranty any safe and reliable operation if used outdoor, beyond the recommended frequency range given in the datasheet and/or without recommended passive crossover circuit. In case of the use of T25, T34 and M74 series drivers in active systems or measurements without passive crossover circuit, DC blocking capacitor must be applied. Any damage or malfunction caused by ignoring abovementioned guide lines will be not covered under our warranty.  

 Surface of beryllium membranes can contain spots, color alternations and be matt or shiny.  These are peculiarities of beryllium foil manufacturing process and cannot be the reasons for the claim.

 In our drivers we are using parts made from natural silk and natural sheep wool. These materials were taking after many listening tests as the best sounding materials. Obviously, natural materials having more material tolerances than synthetic ones. By using internally developed technology, we can minimize these tolerances, however we cannot cancel them completely. These material tolerances can cause some impedance curve irregularities, which are not impacting driver performance and sound quality within the recommended application range and cannot be the reasons for the claim.