Measurement Protocol for all our active monitors
– Environment: anechoic room, temperature: 23 ± 2 °C
– LEVEL and ROLL-OFF on CAL position
– Mains power supply: 230 ± 2 % Vac
Here is the explanation on how we proceed to get the measurements of the Technical Data
| Data | [Unit] | Input signal | Description |
|---|---|---|---|
| Potential peak power | [W] | Hann-burst of 1 cycle Frequency: middle of the bandwidth emitted by the driver in question | Amplifier without limiter with dummy load resistors of the same resistance as a the nominal impedance. The squared peak output tension is divided by the resistance value to give the potential peak power. |
| Max RMS power | [W] | Sinus Sweep @ clipping +6 dB | Done on the complete Monitor. Measurement of the voltage on the connections of each driver. The "Max RMS Power" is the squared value of the Max RMS voltage (Tau = 35ms) divided by the nominal impedance of the transducer. |
| Input impedance | [Ω] | Sine 20Hz-20KHz | A resistance is connected in series with the input of the monitor. The input impedance is equal to the resistance when the attenuation due to the resistance equals -6dB. |
| Input sensitivity | [Vrms] | Pink noise filtered to the announced "Bandwidth at -6dB" | The RMS voltage of the input signal is measured to obtain 90dB SPL at 1m in the axis of the speaker. This value is then multiplied by 3.16 to extrapolate the value for 100dB SPL @ 1m. |
| Input overload | [Vpp] | Sine 20Hz-20KHz | The maximum peak-to-peak voltage of the input signal is reached as soon as the output signal of the input circuit is clipped |
| Continuous max SPL@1m | [dB] | PSI-M weighted noise* Level: Limiter led flashing +6 dB | The maximum SPL @ 1m on axis is retained in RMS with a time constant of 250 ms (fast). |
| Short term max. SPL@1m | [dB] | PSI-M weighted noise** 25 % Level: Limiter led flashing +6 dB | The maximum SPL @ 1m on axis is retained in RMS with a time constant of 35 ms (250db/s). |
| Peak max. SPL@1m | [dB] | PSI-M weighted noise** 25 % Level: Limiter led flashing +6 dB | The absolute value (positive or negative) of the instantaneous peak SPL @ 1m on axis is retained. |
| Background noise @ 1m | [dBA] | Shorted input | The maximum value is obtained by successively measuring the weighted "A" SPL emitted at 0.1m by each transducer. 20 dB are then subtracted to extrapolate the result to 1m distance. |
| Signal to noise ratio (S/N) | The signal to noise ratio is the difference between the continuous max SPL @ 1m and the background noise @ 1m. | ||
| Bandwidth at -6dB | [Hz] | sine sweep 10Hz-40KHz | The bandwidth is measured at 90dB @ 1m on axis in between the lowest frequency and the highest frequency crossing 84 dB. |
| SPL tolerances | [dB] | sine sweep 10Hz-40KHz | The SPL tolerances are the admissible variations in dB of the frequency response within the announced bandwidth. |
| Phase tolerances | [°] | sine sweep 10Hz-40KHz | The phase tolerances are the admissible variations in degrees of phase response within the bandwidth. |
| Dispersion (H x V) | [°] | Pink noise 30Hz-15KHz | The speaker is oriented around an axis going through its SPL origin *** The limits of the dispersion angle are reached as soon as an octave band is attenuated by -6dB compared to the on axis SPL. The angle is given for the horizontal and vertical planes (HxV). |
| Directivity Factor | [.] | Log Chirp | The directivity factor is the on-axis pressure divided by the acoustic pressure radiated in every direction. The typical result is shown on a graph. |
| Distortion THD | [dB] | Sine sweep | A sliding sine signal is adjusted to obtain 90 dB @ 1m. The level of total harmonic distortion is the RMS value of the SPL of the sum of all upper harmonics. The typical result is shown on a graph referenced at 90dBspl. |
| System | [Nb of ways] | Number of drivers with different bandwidths. | |
| Crossover frequency | [Hz] | Frequency at which both drivers have identical SPL (typically -6 dB). | |
| Woofer ext. diam. | [mm] | The dimension is the diameter of the circle circumscribed around the transducer overall. | |
| Woofer ext. diam. | [in.] | The dimension is the diameter of the circle circumscribed around the transducer overall. | |
| W. diaphragm diam. | [mm] | The dimension is the average diameter of the surround suspension. | |
| W. diaphragm diam. | [in.] | The dimension is the average diameter of the surround suspension. | |
| Medium ext. dim. | [mm] | The dimension is the diameter of circle circumscribed around the transducer overall. | |
| Medium ext. dim. | [in.] | The dimension is the diameter of circle circumscribed around the transducer overall. | |
| M. diaphragm diam. | [mm] | The dimension is the average diameter of the surround suspension. | |
| M. diaphragm diam. | [in.] | The dimension is the average diameter of the surround suspension. | |
| Tweeter ext. dim. | [mm] | The dimension is the diameter of circle circumscribed around the transducer overall. | |
| Tweeter ext. dim. | [in.] | The dimension is the diameter of circle circumscribed around the transducer overall. | |
| T. diaphragm diam. | [mm] | The dimension is the average diameter of the surround suspension. | |
| T. diaphragm diam. | [in.] | The dimension is the average diameter of the surround suspension. | |
| Dimensions W x H x D | [mm] | The dimension of the cabinet without connectors, grilles, brackets, etc. | |
| Dimensions W x H x D | [in.] | The dimension of the cabinet without connectors, grilles, brackets, etc. | |
| Net Weight | [Kg] | Weight of the unboxed monitor without packaging. | |
| Net Weight | [lbs] | Weight of the unboxed monitor without packaging. | |
| Mains voltage | [V, ±10 %] | During all measurements the mains voltage is kept within ± 2% of the nominal value. The loudspeaker must operateproperly within voltage variations of ± 10%. |
|
| Mains max DC offset | [V] | An adjustable DC offset is added to the AC mains voltage. The maximum is reached as soon as a disturbance exceeds the tolerance. |
|
| Standby consumption | [W] | The standby power consumption is measured in RMS at the mains input and with 12 V phantom voltage on the XLR input and with the input short-circuited. | |
| Quiescent consumption | [W] | Same as above but with no phantom voltage. | |
| Max continuous Power | [W] | PSI-M weighted noise* Level: Limiter led flashing +6 dB | The maximum continuous power is given by the manufacturer of the transformer. |
| RMS continuous consumption | [W] | PSI-M weighted noise*Level: Limiter led flashing +6 dB | RMS electrical consumption measured during the signal reproduction. |
| Max Relative humidity | [%] | Relative humidity not to be exceed during the storage and the use of the product. | |
| External temperature range | [°C] | Maximum and minimum temperature not to be exceeded during use of the monitor and to maintain good listening quality. | |
| * PSI-M weighted noise | Pink noise with statistical music weighting | ||
| ** PSI-M weighted noise 25 % | PSI-M weighted noise with pulsations 2.5 second ON 7.5 seconds OFF | ||
| *** Origin of SPL | Is the point beyond which the attenuation is proportional to the distance. This is determined by measuring the distance corresponding to 6 dB attenuation and subtracting this distance from the distance of the measurement point. | ||
| PSI Audio OCTOBER 2021 | Methods and figures can be updated anytime if improvements are made either in products or methodology |