Yes, a cap in series will act like a high pass filter. It is done regularly.
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Yes Systembuilder, as 4est stated, it is done frequently. It's a great way to eliminate the need for extra ICs and keep the signal into the main speakers as "pure" as possible rather than running the entire signal through a crossover system first.
All you need to know is the input impedance (resistance) of the amplifier and your desired HP Filter frequency and you can calculate the capacitor value:
C = 1 / (2 * pi * F * R)
Be mindful of the units when using the equation Jafox supplied. If frequency is in Hertz, and input impedance (R) is in ohms, C will be in farads (and the answer will be a tiny fraction of a farad). Move the decimal point 6 places to the right (i.e., multiply by a million) to get microfarads (uf), or 12 places to the right to get picofarads (pf).
For example, 80Hz and 47,000 ohms works out to 0.000000042 farads = 0.042 uf = 42000 pf.
You can listen at igh volume for short periods of time and be fine it is long exposure that destroys you.
When I go out to local shows it is so much louder it isnt even funny and I have been to enough to know. As long as you dont over expose yourself youll be fine.
I play my system loud not for very long periods of time. Dont you ever have fun any more, dont you ever have friends over and pound out some tunes?