So I got this cheep little...

[Techchild 10+ year member]

50 or 60hz is generally used because its right in the middle of the common "sub" range. Too low and you could be running into the SSF, and too high and the LPF could effect the voltage readings.

Thanks //content.invisioncic.com/y282845/emoticons/smile.gif.1ebc41e1811405b213edfc4622c41e27.gif and talking abought lpf if I whant it at lets say. 70hz would I just play a 70hz test tone and adjust the lpf to right after it cuts off the sound?

 

[ARSkemp 10+ year member]

after you found the voltage you are looking for when setting the gain (say 40 volts). Set the gains first. Then turn the lpf all the way up and use a 70hz tone, decreasing it till your voltage is X volts * .5 (in this case 20 if it was orginally 40 volts when beginning the tone).

I think its .5 is what you multiply it by, someone else will prob chime in if i'm wrong.

Although its better to just do it by ear. Just test a bunch of songs and change it as you see fit. But using the dmm is a good starting point.