Onboard FR Series Power Amplification and Electronics

Thanks to our years of power amplifier development, Mackie knows amplifier technology inside and out. The 300- and 100-watt FR Series amplifiers inside the SRM450 are clean-sounding, ultra-reliable, and — most importantly — designed specifically for the drivers in the SRM450 loudspeaker. This last point is crucial because the amplification requirements of a low-frequency driver are enormously different from that of a mid-/high-frequency compression driver.

Low Frequency drivers (regular folk know them as "woofers") are relatively inefficient due in part to the larger size of their moving parts, voice coil, cone, spider, and suspension. So, to properly control an LF driver and move a lot of air, you need an amp that delivers loads of voltage to handle the mass of the woofer cone and keep it moving in a straight, linear, controlled manner.

Compression drivers, on the other hand, are very efficient and need a relatively low amount of voltage compared to their low frequency brethren to achieve high SPL levels. However, the very nature of horn loading requires more equalization to smooth out the response. If the amplifier is too puny, this additional equalization can put the system dangerously close to clipping. So it's far better to have more amplifier headroom than needed to handle transients (i.e. loud volume peaks like big snare or kick hits, slap bass, or singers having a Dio moment).

With the SRM450, we spent countless hours developing and tuning the internal power amps for optimum performance within the entire loudspeaker system. So with Mackie Active loudspeakers, you don't have to worry about amplification. You just plug-and-play.