Speaker Output is a Function of Voltage NOT Power The 118 dB peak SPL capability of this system indicates that it will provide plenty of headroom when delivering a typical 85 dB monitoring level. Note that these monitors are 2 dB louder than the IB2S monitors we demonstrated at the 2016 AES show in Los Angeles. Given the 118 dB maximum SPL, this amplifier/monitor combination will have no trouble filling a good sized control room. Given the size of the voice coils in the M B2S drivers, power compression should be minimal in this example. 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 the 2.83 Vrms level where voltage sensitivity is normally measured (20*log(45.5/2.83)=24.1 dB). If we add 24.1 dB to the voltage sensitivity of 94 dB we can calculate that the maximum sound pressure level should be about 118 dB at 1 meter from each monitor. The maximum unclipped output voltage is 45.5 Vrms (64.4 V peak) into a 4-Ohm load. 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 94 dB, 2.83 V 1 m ( add 3 dB for 4-ohm speakers when doing this conversion). The PCM M B2S monitors have a power sensitivity of 91 dB, 1 W 1 m. We will run through the calculations for Benchmark AHB2 monoblock amplifiers driving 4-Ohm PMC MB2S monitors. This application note can serve as an example for calculating maximum sound pressure levels (SPL) and noise output levels for an amplifier/speaker combination. Both are essential in a precision monitoring system. This underscores the importance of good amplification and good driver design. The passive MB2S monitors driven by the AHB2 were much cleaner than the powered monitors. We had the opportunity to compare these passive monitors to some very high-quality powered monitors and there was no comparison. They fully compliment the distortion-free performance of the AHB2 to provide a system that was cleaner than any monitoring system we had heard prior to this. We were extremely impressed by the unusually clean, distortion-free output of these monitors. Example 2 - PMC MB2SĪt the 2017 AES show we demonstrated two Benchmark AHB2 monoblock power amplifiers driving a pair of 4-Ohm PMC MB2S studio monitors. Use this example for calculating the performance of your system. In this application note we calculate the maximum output level and noise level produced by an amplifier/loudspeaker combination.
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