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ACC 001 - 10 uF 250 v Film Capacitor
This is a premium 10 microfarad, 250 volt polypropylene film audiophile-grade capacitor I have manufactured exclusively for HUMAN Speakers. It is standard on all two way HUMAN Speakers systems that feature my concave dome tweeter, and is used as an upgrade in most of my crossover replacement products.
The vanishingly low dissipation factor (DF) is what makes it sound so good - the DF is a measure of how closely a capacitor aligns with, or deviates from, the perfect curve corresponding to XC=1/(2 π f C) - that is, the impedance is in exact inverse proportion to the frequency. This is especially important in a speaker crossover capacitor, since we are listening to several octaves of music through it, and no frequencies should be attenuated more or less than they are supposed to be.
Here are a few examples of DF measurements of a few 10 uF capacitors:
|Black tube with red ends||Early 1970s EPI 100||50||10.628||5.34%|
|Aluminum electrolytic||Early 1980s EPI 100||100||9.643||6.67%|
|HUMAN Speakers ACC 001||New||250||9.999||0.01%|
Measured on a General Radio 1658 RLC Digibridge at 1 kHz. The last digit of the capacitance measurement tends to fluctuate +/- 0.002 with repeat measurements, the DF by +/- 0.01.
(Actual size approximately 1 1/2" long by 3/4" in diameter, plus leads)
7 Kelsey Road, Lee, New Hampshire 03861