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Old 01-06-2017, 02:37 PM   #1

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Adjusting Crossover Points with O-Scope

The xover scales on my Sundown SAX 100.4 v2 amp do not have enough resolution to set accurately, so I plan on using my o-scope to set them to the exact frequencies I want. For example, the subsonic scale is 10 Hz to 500 Hz (wtf?) and both the LPF and HPF range from 50Hz to 5 kHz. Way too broad to set accurately. My plan is to use a test tone disc and play tones at my desired xover points and adjust the pots until I reach the -3dB points, or 70.7% of signals in the passband. For example, to set my LPF, I would set the LPF pot to something above my target, like 100 Hz, play an 80 Hz test tone, then adjust the pot CCW until the peak voltage on my o-scope drops to 70.7% of the original signal. Is this the best way to do it? Should I aim for a -6dB knee voltage since my amp is 12dB/octave?

Last edited by mossman; 01-06-2017 at 03:09 PM.
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