Are you sure the problem is in the mid driver?
If not trained explicitly for this kind of things, nobody is able to understand what is the exact range of frequencies where the problem lies and type of problem the speaker has. Something it is also very difficult to pin down the driver affected. And a professional music player is no exception, and I say it being a viola player with a degree in music (and one in physics). This is where measurement equipment is essential.
Another point: do you ever listened to the speakers with the factory crossover but new components? (original values, new components) Or are you sure that the drivers don't have faults (e.g. partially dried ferrofluid, in need of reconing, ...)
Ralf
Thanks for the suggestion. And just to clarify, the 6.8uF is in the tweeter filter. The mid has a 5.6uF.
My mistake, I meant the one across the midrange, i.e.5.6. Increasing it's value will reduce output at the upper end of the midrange. Try a 6.8 in place of the 5.6, and see if that's going in the right direction, then fine tune if it is.
Sort of wrong, it's complex. If the drivers were a simple R it would work, but they are not, their equivalent electrical circuit is complicated. At a very simplistic level the drivers have self inductance in their voice coils, which causes the impedance to rise with frequency, so the attenuation effect of a series resistor reduces as frequency goes up. From your description that's not what how you want to tweak the midrange.
This is in my post# 97. "So the sound is pretty good but the upper end of the mid rage is a little bright/accenutated. Can I fix that with a resistor in the mid range filter?" So your remark, "so the attenuation effect of a series resistor reduces as frequency goes up", makes me think a resistor is a good place to start. Would you agree?
There might be an issue with the meaning of words because musicians and sound engineers often have slightly different meanings for the same words. When you say "the upper end of the mid rage is a little bright/accenutated" in the context of a crossover design discussion my tendency is to think you mean the output of the midrange driver, where as a typical musical doesn't think about the system components, just the overall system response.
So when a musician says it sounds "bright at the upper end of the midrange" they are likely talking about the overall sound, not any particular component; and the "midrange" is used as a subjective term, not an object one referring to a specific driver or crossover section. It sometimes takes a bit of to-ing and fro-ing to get on the same page. I've worked with musical types a lot, including supplying sound systems for the Conservatorium of Music at Adelaide University and the director and I took a while to understand each other.
So when a musician says it sounds "bright at the upper end of the midrange" they are likely talking about the overall sound, not any particular component; and the "midrange" is used as a subjective term, not an object one referring to a specific driver or crossover section. It sometimes takes a bit of to-ing and fro-ing to get on the same page. I've worked with musical types a lot, including supplying sound systems for the Conservatorium of Music at Adelaide University and the director and I took a while to understand each other.
Just for information, below is a simplified electrical equivalent circuit for what the crosover "sees" connected to the output of each section, i.e. the driver. Any change to the crossover circuitry is interacting with this imaginary equivalent circuitry inside the driver, which isn't drawn on the schematic. In the circuit below, the crossover electrical output from one section is represented by the '𝖾↑' symbol on the left hand side, and on the right hand side '𝗿𝖠' represents acoustic output of the driver. There are three drivers in your system and each has a similar equivalent circuit. The total acoustic output of the system is notionally the sum of the three 𝗿𝖠's, but still must take into account the physical positions of the drivers relative to each other and the shape and size of the baffle.
The B&W site seems to have no specifics for the drivers in the P6. Your diagram identifies the tweeter as DT 94 4ohms and the mid and woofer as WS 17 E 8ohms. What do the lables relate to? Do you know the specs. for the P6 drivers?
So I’ve tried resistors in series from 3R to 9R and none tame the overly bright/loud upper piano notes. My attachment shows the addition of what I thought would be an L pad. Does this make any sense? Or are there other ways to attenuate the problem tones?
