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In Reply to: RE: Altec 605b simple xover posted by Joe Roberts on November 20, 2016 at 09:28:31
Thanks for the reply
To answer your question, I already have some L-pads on the way.
I listen to singer/song writers, so vocal range is important. If I used the xover calculator right, I used a 3.3uf for a 3K xover. The voices came into the room, but the horn was screaming. I moved the xover up to 4K9(wanted 4K, but miscalculated) with 2.2uf. Became very listenable. Added a 0.47uf to the 2.2uf, but the screaming came back.
When I get the L-pads, I'll go back to the 3.3uf and see if I can tame the screaming.
I'll get some oil caps when I settle on a cap value.
Any other advice will be appreciated.
I use a pair of subs with the OB 605b's.
Follow Ups:
Although flying by ear can work, the best thing to do is measure the output of the LF then add the tweeter above the rolloff point.
Rollofs will be slow in your case, so leave a gap. The gap between the LF and tweet will be filled in somewhat as the two sources add.
This addition process is probably why your low xover was screaming, peak at 3k which is a sensitive range of hearing (and the scream zone).
You can get a RTA (Real Time Analyser) app for your phone that will greatly assist in this. A mic and a laptop with free software is another avenue to empirical knowledge.
4.9k might not be a bad place to be, maybe even a touch higher. Depends on what the woofer is actually doing. Basically you want to avoid overlap at frequencies where the woofer is still going strong because the two sources will add to a deadly peak.
A minor suckout at 4-5k might not sound as bad as a wicked peak.
With a handful of caps, an L pad, and a phone app you should be able to get that setup reasonably well lined up.
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Free your mind and your ass will follow -- Parliament/Funkadelic
My plan is to get the L-pads and play with different cap values to find what I "most " like. Then compare it to the Markwart xover.
Any recommendation for a RTA app for my iPad?
Thanks for your help.
Luddite that I am, I use a $12 flip phone, but surely there are many knowledgeable app freaks in the general vicinity.
For the purpose at hand, ultimate precision is not necessary and may even prove distracting, but it would help to have a general idea of what is going on.
What the rolloff of that OB woofer looks like is the key data point in situating the tweeter filter.
I use a Parts Express measurement mic and REW when dialing stuff in. I also just wing it a lot for wild-ass experiments but sometimes I need to check my work when I am unhappy with the direction things are going.
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Free your mind and your ass will follow -- Parliament/Funkadelic
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