![]() ![]() ![]() If we subtract the SNR from the peak SPL determined above, we can calculate that the amplifier noise will be reproduced at a level that is 19 dB below the threshold of normal hearing (116-135=-19 dB SPL). This means that the output noise will be about 135 dB lower than the maximum sound pressure level produced by the monitors. In bridged mono the AHB2 has a 135 dB A-weighted signal to noise ratio. Amplifier Noise is Well Below Audibility - A Quick Estimation The IB2SE hifi version has identical performance and should be very capable in just about any home environment. Given the size of the voice coils in the IB2S drivers, power compression should be minimal in this example.Īt 116 dB SPL, this amplifier/monitor combination will have no trouble filling a good sized control room. This calculation ignores the slight losses that would be produced by power compression due to voice coil heating. This is 24.1 dB higher than 2.83 Vrms (20*log(45.5/2.83)=24.1 dB). If we add 24.1 dB to the voltage sensitivity of 92 dB we can calculate that the maximum sound pressure level should be about 116 dB at 1 meter from each monitor. The maximum unclipped output voltage is 45.5 Vrms (64.4 V peak). With a 4-Ohm load, the AHB2 monoblocks will deliver 518 Watts. From the voltage sensitivity, we can calculate the maximum sound pressure level when the monitors are driven from AHB2 amplifiers running in mono mode. At 4 ohms, this is equivalent to a voltage sensitivity of 92 dB, 2.83 V 1 m ( add 3 dB for 4-ohm speakers when doing this conversion). The PCM IB2S monitors have a power sensitivity of 89 dB, 1 W 1 m. This plot demonstrates the high level of clean power that is available from the AHB2 when driving 4-ohms in bridged mono mode. The THD+N is only 0.00083% at 518 W! At the upper right-hand corner of the plot we can see that the AHB2 delivers about 590 W at 1% THD+N. Note that the output of the AHB2 reaches 518 watts (W) before the THD+N, which remained below 0.001% begins rising. The input level is swept over a 20 dB range which is equivalent to a 100:1 power range (producing a 6 W to 600 W output power sweep from the AHB2). The horizontal axis is the input level to the amplifier. The narrower red line shows the total harmonic distortion plus noise (THD+N), which can be read in percent from the right vertical axis. The following plot from an Audio Precision audio analyzer shows the output of the AHB2 driving a 4-ohm load in the bridged mono (single channel) mode. The magenta-colored heavy line shows the power output in watts (W), which can be read off the left-hand vertical axis. AHB2 THD+N and Power into 4-Ohms, Bridged Mono
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