RTA-12Cs, need to rebuild cross-over??
garcianc2003
Posts: 20
Hopefully F1Nut will read this since he recommended this almost a year ago. You can say "I told you so" if applicable.
How do I know if my crossovers need to be rebuilt?
I can program in 5 languages and am pretty handy with computer hardware but don't let me anywhere near a soldering iron! So, if your explanation involves breaking out schematics, you lost me at hello.
Here's why I asked. I added a Velodyne SMS-1 subwoofer management system to my HT rig. Despite my main speakers (the RTA-12Cs) being set at 80Hz cross-over on my processor and my Sunfire True Sub set at max (100Hz, so I can let the SMS-1 manage that), the curve on the SMS-1 test graph exhibits a severe dip at around 100Hz and another one at around 160Hz. Raising the eq setting on the 100hz slider on the SMS-1 does not do anything. Raising the volume on the processor doesn't appear to raise that frequency much either. Therefore I suspect that there is probably nothing (or very little) coming out of the speakers at around that frequency.
BTW, the SMS-1 cannot touch anything above 100Hz.
How do I know if my crossovers need to be rebuilt?
I can program in 5 languages and am pretty handy with computer hardware but don't let me anywhere near a soldering iron! So, if your explanation involves breaking out schematics, you lost me at hello.
Here's why I asked. I added a Velodyne SMS-1 subwoofer management system to my HT rig. Despite my main speakers (the RTA-12Cs) being set at 80Hz cross-over on my processor and my Sunfire True Sub set at max (100Hz, so I can let the SMS-1 manage that), the curve on the SMS-1 test graph exhibits a severe dip at around 100Hz and another one at around 160Hz. Raising the eq setting on the 100hz slider on the SMS-1 does not do anything. Raising the volume on the processor doesn't appear to raise that frequency much either. Therefore I suspect that there is probably nothing (or very little) coming out of the speakers at around that frequency.
BTW, the SMS-1 cannot touch anything above 100Hz.
Post edited by garcianc2003 on
Comments
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garcianc2003 wrote:How do I know if my crossovers need to be rebuilt?
1. If things don't sound right.
2. If the electrolytic caps are 10+ years old.
Either find a fellow Polkie to do them or take them to a good hi-fi tech. Of course, new crossover parts will not guarantee the solution to the issue you're having. It could be a suck out caused by the room acoustics.Political Correctness'.........defined
"A doctrine fostered by a delusional, illogical minority and rabidly promoted by an unscrupulous mainstream media, which holds forth the proposition that it is entirely possible to pick up a t-u-r-d by the clean end."
President of Club Polk -
Thanks F1Nut, I might have to make that my next project. If you know of anyone in the Baltimore/DC area who can do that, PM me if you can.
On other news, I was able to fix the 6dB 100Hz dip on my curve by: 1) reading the SMS-1 manual, 2) closing the door (no kidding), and 3) lots of experimenting with subwoofer positioning, phase and eq settings. I have achieved as near a flat line as I think I can (or my time permits). -
I was going to suggest room anomalies, but you found them first.
You can do the repairs, just get a good soldering iron/station. I didn't think I could, but my conidence level has stregthened, somewhat. Plus you get the satifaction of your hands...
