Passive subwoofer filter


Rating: 0.00 / 10 
Audio Filters Circuits / Audio Circuits

The schematic shown, does no need any power supply because is a simple low frequency passive filter. It could be usefull if you want to drive an extra subwoofer from your stereo system.

Passive subwoofer filter - img1

The circuit filters the frequency ranges above the 150Hz. The schematic is calculated to work with a 50 watts audio amplifier, but can be used with higher powers as well. The frequency can be adjusted with 2k2 potentiometer from 50 Hz to 160 Hz.


Mar 13, 2008 Nick

Nice Schematic. I think it must be between Pre and Poweramp right? Gru? Niklas

Aug 7, 2008 jezzus

The schematic is missing more comments - what 10K potentiometer does, how powerful should be resistors and potentiometers...

Aug 29, 2008 angelvirus

i need subwoffer schematic circuit

Dec 21, 2008 Tibi

To should know the answer, while you are trying to build a circuit for low power signal means the 10 K Potentiometer is for the voulme level setting, and you dont need any resistor with specal high power. the most output devices provides an output with max 0,1 wat or lower.

Jun 14, 2009 werdna

What components would you have to change to increase frequency cutoff range to around 400hz?

Sep 14, 2009 anburaj

Where to connect the circuit. i build the circuit and i connect before my sub woofer and also try to connect before my power amplifier input line but the circuit not working if i connect any 10k ,2k2 volume control(preset) please reply i have stereo amp ,sub-woofers 2*240w i want real bass effect

Dec 13, 2009 asbn

could any one can tell more details about this circuit were like this circut to connect amp and capacitor in volts so im a beginer to electronics.

Dec 13, 2009 asbn

sorry.Rewrite!. Could anyone can tell more details about this circuit were like we have to connect this circuit and how this circuit works, role of each components etc

Dec 18, 2009 Trippy

You would wire this up after you sub PRE-amp but before your sub POWER amp (ie between the two). most setups this will be running between the source unit and the poweramp/subwoofer. In most cases this wire has RCA connections either side. Do NOT wire this after your poweramp.

Jan 9, 2010 Rokas

Did anybody had tried that? Post some examples to youtube, thanks.

Jan 12, 2010 shahul hameed s

Best circuits with punched bass.Modified circuit with single op amp with good LF tonal response available.

Jan 15, 2010 s.shahhul hameed

you should remember that frequency is inversly proportional to passive components lke resistors &capasitors.Use the formula for cutoff freq calculations f=159.2/rc .substitude the resistence &capacitance value directly.

Jan 19, 2010 shahulHameed s

16.2 ch running surround sound system !!!!!. XY plane only . do you Want ? contact

Aug 8, 2010 jimmy

be sure where to connect the circuit?im confuse where to connect this

Aug 19, 2010 s.shahul hameed

3.2 ch surround circuit with good tonel response available contact me

Leave Comment

characters left:


Passive RC low pass filter tutorial!

Tiny Subwoofer Amplifier Circuit With UA741