Trippigs Posted April 17, 2018 Share Posted April 17, 2018 Is there any way to test the preformance of a crossover with a multimeter? I have a pair of 1985 vintage Industrial LaScala loudspeakers and the AL3 crossovers are original. I understand they are not likely to be in spec but would like to determine this empirically rather than sonically. Any thoughts? Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted April 17, 2018 Share Posted April 17, 2018 You can check solder joints and connections with a multimeter (ohm meter) but to check the crossover as a whole you'd need a spectrum analyzer. To check the caps you'd need an ESR meter. Quote Link to comment Share on other sites More sharing options...
Trippigs Posted April 17, 2018 Author Share Posted April 17, 2018 Well heck....I don’t happen to have that testing equipment laying around! I appreciate your reply and will go to plan B which is to keep what I have until I feel adventurous. Quote Link to comment Share on other sites More sharing options...
Dave A Posted April 17, 2018 Share Posted April 17, 2018 Talk to Bob Crites. I would imagine he would analyze your crossover for a reasonable fee. Fluke has a 117 multi meter that will check ohms. diodes and capacitors. Check EBay for prices. It will not do larger value caps well though and no ESR measurement. The Fluke was over 10% off what I measured with a B&K 885 on caps 30uf and up. Every crossover cap that old I have measured has had high ESR on the caps even if they were in spec otherwise. Quote Link to comment Share on other sites More sharing options...
pzannucci Posted April 17, 2018 Share Posted April 17, 2018 Since the crossovers are not "text book" and you don't really know the curves, you would need to either guess or test component by component. You could at least substitute resistors in the network if you had a frequency generator and measure the drop across the resistors at the particular frequencies to figure out what was happening, provided you had a good multimeter (true rms or something). Then you could at least compare both crossovers to be the same. You really would need the right equipment and measure across each leg of the crossover. Either way, you will need more than what you probably have and it is a tedious method using a multimeter. Quote Link to comment Share on other sites More sharing options...
Trippigs Posted April 17, 2018 Author Share Posted April 17, 2018 Definitely above my skill set. I previously spoke with Bob Crites and purchased his CT 120 tweeters. We discussed getting new replacement crossovers as well but I did not ask about testing the original ones. Normally I would be skeptical about asking someone who sells new products to test my old products for function....but not with Bob as his sterling reputation is well deserved. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted April 17, 2018 Share Posted April 17, 2018 I'd replace the 30 year old caps and go about my business. Quote Link to comment Share on other sites More sharing options...
Trippigs Posted April 17, 2018 Author Share Posted April 17, 2018 Yep...you are right. Bob would rebuild my AL3 crossovers for $160. I travel through Russellville on occasion and might take the opportunity to meet Bob and drop the crossovers off as well. Thanks to all for the feedback and suggestions Quote Link to comment Share on other sites More sharing options...
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