Gain and sensitivity chart

[Ben Lawrence]

Can someone assist in explaining this chart for dummies? Running a pair of SRX715 over 2 SRX718s per side fed by dj mixer, dbx260, pair of cvr 3002. It looked like the Wizard in the DBX had a 1.41vrms setting would I just match that with the 41 gain on the amp?

 

[Art Welter]

Can someone assist in explaining this chart for dummies?

Simple "rule of thumb" explanation:
When working with power (measured in watts): +3 dB is double the power, +10 dB is 10 times the power.
Power amplifiers actually amplify voltage, voltage x voltage/impedance =power in watts.
When working with voltage or current: 6 dB is double the voltage, 20 dB is 10 times the voltage.

The chart indicates the input voltage required for the amp to reach it's rated power at 1kHz with various voltage gain settings with the front panel gain set to "0dB" (fully clockwise).
The amp does not limit voltage or current in the 8 ohm 2 channel mode, but does limit into lower impedances or when all channels are used.

Running a pair of SRX715 over 2 SRX718s per side fed by dj mixer, dbx260, pair of cvr 3002. It looked like the Wizard in the DBX had a 1.41vrms setting would I just match that with the 41 gain on the amp?

Wizardry aside, 41dB of gain is the amplifier's most sensitive setting, requiring the least input voltage for full power.

If you want the amplifier to be driven to full output with only 1.41vrms, (+3dBv, or +5.2dBu) then you would use the 41dB gain setting.

All that said, how you want to set your DSP gain structure and limiting for a DJ system depends on the mixer's output and your preferences.

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Art

 

[Ben Lawrence]

Art. Thank you so much I very much appreciate it. I tend to try to set things up conservatively especially with a DJ. I unfortunately did leave it on the 41db setting as I did not check back in time. I had amps at 12 o'clock and 11 o'clock. Will let you know in the next couple days if I'm smoked.
I will find the time to gain stage and limit with dsp. I do know the DJ is not a red-liner and those cabinets can take a good bit of power so as long as my processer is not compressing a square wave I think I should be ok on this one. Again appreciate the insight and will dig a bit deeper into it when I get a little time. Hard to find the time and space pre show to run stuff hard due to the volume and power required. The powered stuff is a lot easier to manage but sometimes for outdoor stuff it's nice not to have to run power to each location and no exposed amp modules.

 

[Art Welter]

I had amps at 12 o'clock and 11 o'clock. Will let you know in the next couple days if I'm smoked.

That could leave the DJ 10-20dB more gain available when cranked up.
Generally safer to reduce the sensitivity with a back panel switch rather than leave the option for ten times the power available for any knob twister that happens by.