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noviygera 14th October 2011 06:44 PM

(minimal) speaker level vs. line level high pass filter

I'd like your input please regarding one method vs. the other. Currently using multiple amps on my full horn system with a simple 6db/oct high pass on the tweeter (single 5.6 mfd Dayton cap) at the speaker level.

I'm able to move the high pass filter to the line level because I'm multi-amping.

What would I gain and loose? Obviously, the goal is to upgrade the current Dayton cap to see if I can get better sounding high pass filter but the nice paper oil copper caps are pricey so I am thinking about a fundamental change here.

Than you,

AndrewT 15th October 2011 10:43 AM

There are many who recommend retaining the speaker feeding capacitor for protection of the voice coil from damage.

You can combine, or not, the natural roll-off of the tweeter, with the roll-off of the protection cap, with the active roll-off of the preceding filter to obtain 18dB or 24dB/octave slope to any of the Q values that you find would suit the driver.

Alternatively move the active filter frequency up so that the natural roll-off is well below passband. Move the protection cap roll-off to well below passband by making it bigger. Bigger than required reduces the voltage across it and thus reduces the distortion. Adopting a cheap large polypropylene film and foil of 4u7F to 10uF, would probably do.
This results in the active filter controlling the rate of roll-off and the Q of the roll-off.
Finally adopt just sufficient EQ to get the driver sounding nice.

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