Zero Monitors - running mains behind band.

[mambo4]

I thought a cardinal rule of sound reinforcement was to NEVER place a mic facing a Mains/monitor speaker, for obvious feedback reasons. Does the fancy pants bose system has a solution for that?

 

[Big Brother]

Does the Bose have feedback suppression built in or something?

Cause its a law of nature: Gain > 1 and signal in phase at that frequency = feedback. No way around that, unless they detect and cut the gain at that particular freq with a notch filter.

Or they just don't have any significant high freq response at the likely feedback freqs....

Randy

Bose doesn't place as much focus on accurate reproduction as they place on solving problems that drive potential consumers away. They do it the most cost-effective way, basically they just eliminate problem frequencies. You didn't want to hear that piccolo anyway, right?

Basically it sounds like they stayed true to their MO and just rolled everything off above 12Khz and start to get shrill above 6Kh.

Here's a pair of competing reviews...
FOH Online - Bose L1 Plus B1 Subwoofer - Point/Counterpoint - Another View

This quote from above also explains how a line array can appear to 'cheat' physics a bit on its own to help... Interesting stuff.

The L1, like all properly designed line arrays, is more resistant to feedback than a conventional point source speaker. In a conventional speaker, the physical distance from the microphone to the speaker is the same as the acoustical distance. If you put the microphone three feet from the grille, both the physical and the average acoustical distance would be three feet. For the L1 or any line array, the acoustical distance from the microphone to the speaker is always greater than the physical distance. If you put a microphone three feet from the 6.5–foot L1, the physical distance to the closest part of the line array is still three feet, but because of the line array's length and the difference in distance between the closest and furthest point, the average acoustical distance is four feet. The L1 is a true line source from 150hz to 8kHz and inside that range, the L1 will, from feedback perspective, behave as if it is four feet away. Line arrays also drop off in level at 3dB when distance is doubled, compared to 6dB for point source speakers.

Considering that a line array is much louder at the same distance than a single point source, that means less stage volume is necessary to get the SPL you want at the FOH, meaning less stage volume to feedback. Combining all those factors probably makes it the system pretty feedback resistant overall. At the expense of your highs though in this case.