Remove bass signals

[4pyros]

i dnt know , how to check that?

Look at the sub, may be listed on it or look up the model number and find it on line.

 

[audioguru]

All half-decent audio systems that use a sub-woofer have an active lowpass filter feeding the sub-woofer amplifier and active highpass filters feeding the stereo amplifier.
Then the sub-woofer is not fed higher frequencies and the stereo speakers are not fed very low damaging frequencies.

Passive filters would be huge and expensive.

 

[audioguru]

"Satellite" speakers are not full-range because they are too small. They are more like tweeters. Their bass response drops at maybe 400Hz. Then the "sub-woofer" must perform all the woofer frequencies in addition to the sub-woofer frequencies.

A simple capacitor feeding the input resistance of the amplifier is a very simple filter with a very gradual slope of only 6dB/octave. Most audio filters are active and are 12dB/octave or 18dB/octave which have much steeper slopes.

 

[Ziddik]

as jack asked in post #14 what is that green "thing"? What kind of capacitor is that? Is it possible to filter bass using it?

 

[4pyros]

as jack asked in post #14 what is that green "thing"? What kind of capacitor is that?

Its a Mylar Capacitor.

Is it possible to filter bass using it?

Any kind of cap can be used to filter bass. as long as it is the right capacity.

 

[Ziddik]

Its a Mylar Capacitor.

Any kind of cap can be used to filter bass. as long as it is the right capacity.

got it pyro, thank you and do these capacitors have polarity? I got plenty of them from an old amplifier.

 

[audioguru]

The "green cap" is an Oriental metalized plastic film type which is similar to a European one that is boxed. Its value is marked "103" which is 10,000pF, 0.01uf or 10nF. Its tolerance is marked with a letter where J is 5%, K is 10% and M is 20%.
The same value for a European metalized plastic film capacitor would be marked "10n" then the same letter for the tolerance.

Since it is just a capacitor that feeds a resistor then the filter slope is a very gradual 6dB/octave.

EDIT: A metalized plastic film capacitor is not polarized.

Here is a photo of some European metalized plastic film capacitors: