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Message Forums Car Stereo Message Forums > > Establishing crossover cut offs acurately
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joshwill0001
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 Establishing crossover cut offs acurately

May be a stupid question but on all the active crossovers I have (crossovers on amps and separate active crossovers) it simply states the upper and lower bounds of the crossover but the selector knob does not specify any intermediate values. For example the crossover on one channel of my Audiocontrol 6XS goes between 90 Hz and 250 Hz (front lowpass). Say I want to set it at 120 Hz is there any way to establish exactly where 120 Hz is (other than guessing that is)? The selector knob does not differentiate very easily so I guess it would need to be measured via the amp output to speaker. Any instruciton on how to do this would be appreciated, or set me straight where I am wrong. I am guessing an oscilloscope may be involved (dont have one and dont know how to use one if I got one). Any other solutions? Or am I being overly obsessive and just guessing will do ok? CHeers guys.

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New Post 02-10-2007 05:17 AM
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thrtyhz
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I would say just get it close, and if it sounds good then go with it. The frequencies written on the crossover may be the start of the rolloff or the 3 db down freq. it also depends on the slopes and how they match from one to the other, then add the interior characteristics, so to get it perfect involves more than setting it on a certain number. A super sensitive rta could be helpful but may be hard to get access to one.

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New Post 02-10-2007 07:58 AM
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joshwill0001
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 RE:

quote:
Originally posted on 02-10-2007 by thrtyhz
I would say just get it close, and if it sounds good then go with it. The frequencies written on the crossover may be the start of the rolloff or the 3 db down freq. it also depends on the slopes and how they match from one to the other, then add the interior characteristics, so to get it perfect involves more than setting it on a certain number. A super sensitive rta could be helpful but may be hard to get access to one.

Cool. I always assumed that the set value was the beginning of the roll off...6XS manual doesnt say anything either way that I can see. I guess I was hoping that there was a set procedure (like setting gains) where you can somehow exactly measure the output and then fine tune the controls as necessary. I get what you are saying though...didnt think about all the variables that would be involved. Thanks

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New Post 02-10-2007 09:28 AM
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thrtyhz
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Your welcome, good luck

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New Post 02-10-2007 08:09 PM
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