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Old 19th June 2005, 08:51 PM   #1
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Default Active crossover dirty slope

Just bought an Active crossover it seems noisy at woofers highest and tweeters lowest> Any suggestions?
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Old 19th June 2005, 09:57 PM   #2
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whatcha buy?
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Old 20th June 2005, 02:01 AM   #3
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Default Crossover

ART 311. It was cheap but I figured that with the success with sla-1 amp and DI/O, the 311 might be a winner.... It's not. Maybe moddable?
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Old 20th June 2005, 03:07 AM   #4
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Can you be a little clearer about the problem?

Grey
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Old 20th June 2005, 03:41 AM   #5
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Default crossover ART 311

Yes, Please help!!!
I bought this crossover(cheap) Knowing the SLA-1 and DIO success, I hope this also would be a success.
the upper range of the woofer has distortion, harmonics resembling the resonance of a filter. It almost sounds like the highs are trying to fight the filter. The lower limit of the tweeters is doing the same although not as noticable. It is not terrible when both drivers are up but it's not very nice either. The thing should be set at 800Hz because it's more like PA gear than studio gear.
I am stubborn and would rather make it nice than to walke away and buy another one. I am a newbie but I am good with my soldering iron and follow instructions well.
At this point I do not have schematics just digicam.
It has all jrc 2068 opamps (14). No decoupling caps close to opamps.
Interesting!!
Just now, while inspecting circuit, I noticed two circuit traces appear to have been cut intentionally. They are both on ch2. Also one cap has been soldered in. I can see a differnt type of solder.
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Old 25th June 2005, 04:52 PM   #6
Brion55 is offline Brion55  United States
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Is it happening on both channels? One thought would be the resistor (s) that determine the damping on the filter being open, but the likelyhood of it affecting both channels is slim. Bad opamp perhaps?
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Old 11th July 2005, 03:26 AM   #7
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Default Slope

I am sorry for my ignorance. It seems that there is no explanation except that the drivers I had were not designed for two way as I had been informed. The gentleman who sold me the vintage wharfedales said "Gee... maybe they weren't two way after all" This was following my persistence that he was mistaken. I broke down ordered some nice drivers.
On a lighter note. Everything I have experimented with(even worst case) is much more transparent and detailed than music store active monitors.
Thanks
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