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In the tweeter circuit above, I am planning to evaluate smaller-value caps as tweeter cap bypass caps. The existing caps are 8.2 and 41 uF, and I'm trying to determine which ONE place would show the effects of bypass more clearly..
So I just bypassed the 2 larger caps with two 0.1uF FT-3 Russian Teflon caps. I did some critical listening beforehand with my test tracks, and after bypassing, I did some initial listening as well.I was pleased to find only nice film caps (Aeon Tru Caps) and no electrolytics in the stock crossover. BTW, all the teflon caps were previously well-used and burned-in.
A bit unexpectedly, the FIRST thing I noticed was an improved imaging specificity and more solid, 3-D rendering of those images. I was expecting to hear more high-end resolution and extension, which was also true, but it was the 3-D, palpable images that really popped out.
These are not night-and-day type differences but well worth the effort so far, and we'll see if things improve further with more use...
Edits: 10/20/09 10/20/09
I would bridge over both caps with a single 0.1uF, I've done this before and been quite satisfied.
Bypassing both with one 0.1 uF PP or PS or teflon should provide excellent results.
If you were leery of doing that for some reason, or want to retain the purity of the topology, then bypass the larger cap, it needs more help than the smaller cap.
Be sure to use a high quality cap, no ceramics or mica's.
Jon Risch
Wouldn't it make more sense to use a bigger bypass cap for the 41uF than for the 8.2uF cap?
...why not just run a set of three wires from the current circuit to the exterior of the speaker cabinet? One wire from the amp side of the circuit, one wire from the mid-point in between the two current caps, and one from the tweeter end of the last cap.
That way you could easily attach caps of various sizes in different configurations to see which works best for you. When you settle on a final layout, remove the temporary wiring and make the change permanent.
You'll arrive at your final setup much faster and have greater confidence that you've made the best choice for your purposes.
Those are not bypass caps but, rather high pass caps. Since C2031 is so much larger than C2011, it is likely to be a greater determinant of the high pass frequency.
What do you mean by "show the effects of bypass more clearly?"
Kal
Some (many?) speaker designers advocate "bypassing" the pre-existing large high-pass caps with smaller bypass caps, kind of like bypassing power-supply electrolytics with smaller film cap..
I thought you intended to replace one of the caps. I would start with bypassing the larger cap, if I was doing such things these days.
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