Hi-Fi DX Bass circuit

jacky April 7, 2010 47 Comments


Here is the circuit diagram of a passive DX bass circuit that can be used with almost all audio amplifiers. This circuit is designed by Mr. Emmanuel Chipula (emmanuel@windowshoppingmalawi.com) from Malawi and was sent to us for publication.We tested this circuit in our lab and the result was fine.Full credit of this circuit goes to Mr.Emmanuel Chipula and we thank him for his contribution.

Emmanuel’s comments on the circuit : The circuit that I have designed is a passive one but you can make it an active one by adding a pre amp at the output. The first stage acts as a main tone stage. It balances the bass and the treble. The 0.01 cap is for high frequency while the 0.22uF cap is for low frequency. The second stage is for sound compression. the caps works the same as at the first stage only that they are there to start the sound compression that is received from the input stage. The 2.2k resistor delays the sound thereby multiplying the compression. The 10k variable resistor is there used to tune the compression depending on the frequency of the speaker. If you are using 4 to 6 inches hi-fi speakers, I advise you to keep the 10k variable resistor at 0 ohm. The circuit is not copyrighted and you can change it to suit your requirement. All I ask is to be posting the updates of the circuit design on the site.

Circuit diagram.

DX bass circuit


  • Assemble the circuit on a good quality PCB.
  • This circuit does not require a power supply.
  • POT R6 is for volume control.
  • Switch S1 can be a slide switch and it is the DX Bass switch.

  • Saad
    August 9, 2018

    I have searched here and there. But not found the capacitor 0.22pf. Now can i replace them?

  • S K Dogra
    October 17, 2017

    circuits really works goo when assembled correctly and connected as suggested. Thanks

  • wajaht ali
    August 16, 2017

    i want to use this circuit with 500+500 watt amplifier . is this possible?

  • Debanshu
    August 11, 2017

    What is the S1 here in the circuit diagram?

  • Avtar Singh
    October 26, 2016

    Hi dear Can I get PCB for 150 watt to 300 watts active woofer PCB

  • prashanna Poudel
    July 21, 2016

    Hlo sir heartly thank-you for your contribution but i have one question i.e i had assembled all the components in the circuit but the main problem was where to use it?? i mean i had jst made an amplifier by using 2×4440 ic and the supply was 12volt in it …. so i just connect output of your circuit in the input of amplifier and as a result i found nothing, so that was my fault or what iam just confuse……

  • chauhan chandresh
    May 29, 2015

    it’s nice and very effective.

  • April 8, 2015

    Sir my home theator switch on time full bass comeing so how to control bass sound

  • H,A.Piyadasa
    March 16, 2015

    It works well. Many thanks for the contribution.

  • abraham
    November 7, 2014

    How can i add treble control in this circuit?

  • June 16, 2014

    sir would i use this DX bass circuit in your 150(3 TIP) amplifier???

    • Seetharaman
      June 17, 2014

      Yes you can use with 150 watts amplifier. you may have to add a single stage amplifier with a gain of around 20 to compensate for the attenuation in the above passive filter.

  • June 15, 2014

    And sir also send me link for 120+120 watt audio amp easy amp (efy book)..advance thanks

  • June 15, 2014

    Sir would i use this DX base circuit in your 150 watt(3 TIP) amp

  • James
    January 12, 2014

    I really hope you are still answering questions. First, as I am planing to use the bass knob on my pre-amp, can I just skip R6 and use the knot where C4, R3 and S1 connects? And the second one: are those capacitors electrolytic or bi-polar, because I’m not very familiar with the american way of indicating components in schematics. Thanks in advance 🙂

  • sunil
    September 8, 2012

    can you help sir

    it can us this circuit dual supply amplifier

  • Seetharaman
    May 5, 2012

    Hi John add an amplifier with a gain of 50, should be OK. if you want an active circuit use the following link

  • May 5, 2012

    but how can i make it an active circuit?

  • Seetharaman
    April 26, 2012

    Hi John what is the problem faced by you. this circuit will attenuate the signal. this is not an active filter, hence you have to compensate for the loss.

  • john
    April 25, 2012

    Does this really work, coz its failing me

  • prudencio g. peritos jr,
    April 20, 2012

    Thank you so much friend for emmidiate replied of my message.God bless you

  • Seetharaman
    April 20, 2012

    Hi friend all resistances can be 1/4 watt and all capacitors not less than 50 volts.

  • prudencio g. peritos jr,
    April 20, 2012

    hi mr. emmanuel chipula asking a question regarding the resistor, 1/4 or 1/2 watt?,,,and the capacitor over how many volts… all were not indicated at
    the diagram shown

  • seetharaman
    November 15, 2011

    Hi Caloy one speaker you connect direct through an amplifier and the other speaker connect antiphase to the first speaker. (both speaker to be 180deg out of phase)
    From center out through low pass filter connect to sub woofer amplfier and sub woofer.

    • Diego
      July 17, 2013

      Btw is there a way in which you can modify tha circuit to have 2 outputs, one for the low pass and the other high pass, then to the amplifier

    November 15, 2011


    the above circuit only shows 1 channel at the rear output…is there any other circuit that has 2 rear outputs????

    and where will i connect a low pass filter????

    by the way thanks for that circuit…

  • seetharaman
    November 13, 2011

    Hi Kamalakannan please do not mix single supply and dual supply circuits. they will sound hard. with a sine wave oscillator and a dual trace oscilloscope you can see the type of distortion you get on the output sine wave of the amplifier. Hence please use dual supply (using identical plus and minus power supply)amp with dual supply pre-amp / tone controls only. TDA1524 will be a good tone control for Motional feed back amplifier as it is also with a single 60 volts DC supply from the same supply through a 12 volt regulator can be used for the T/C IC.

  • kamalakannan
    November 12, 2011

    Hi i have TDA 7294 Power Amplifier. I will tried TDA1524 tone control its sound is very hard. So now i will decide to remove tone control. Please suggest me best buffer circuit and compressor circuit.


  • Seetharaman
    June 15, 2011

    Hi Pranshavs you have to increase the gain by an active element to take care of losses added by the above circuit.

  • Seetharaman
    June 14, 2011

    Hi Pranshavs you have to use this circuit between preamp out and main amp input. as this circuit attenuates the signal you have to use additional amplification of around 25 to take care of this attenuation.

  • pranshavs
    June 13, 2011

    I made this HI-Fi DX bass circuit but it doesn’t worked. Only buzzzzz and very low music is coming out of the speaker. I don’t know what to do/ I really need this circuit to work but couldn’t make it. Could you please upload an image of your soldered and complete circuit board that you made or help me where is the problem?

    Actually I am new to this stuff that’s why need your expert advice.

  • July 23, 2010

    Hi can any one give me the circuit diagram of streo to 5.1
    channel sound converter with dolby pro.

  • June 7, 2010

    OK Dada, Thanks you a Lot .

    – Digonto

  • seetharaman
    June 7, 2010

    Hi Digonto you will get good LF response with TDA2822M in bridge mode with single Hi-Fi DX Bass Circuit.

  • June 7, 2010

    Hello dada, If I use here a single circuit then I have to make the TDA2822M as Bridge . But I want to input in TDA2822M as Stereo , As I mentioned in my previous comment .

    Now what do you suggest ? Will I chang the circuit for TDA2822M as Bridge ? Will I get best result in Bridge mode ?

  • seetharaman
    June 6, 2010

    No Digonto you have to use only i0nf that is 103 as this is a frequency sensitive component which desides the frequency response. you can use mono controls as you require only one channel as i have indicated to you. for 50 K you can use 100k for 10k you cannot use 100k as you will have variation only at the extreme end of the pot and your adjustment will become very critical

  • June 6, 2010

    Dada, I am using this bass circuit as a pre-amplifier for TDA2822M which you suggested in Pocket Headphone Amplifier . If I use here a single circuit then I have to make the TDA2822M as Bridge . But I want to input in TDA2822M as Stereo .

    Now what do you suggest ? Will I chang the circuit for TDA2822M as Bridge ? Will I get best result in Bridge mode ?

  • June 6, 2010

    Ok, I have got 0.22μF electrolytic . But not found 0.01μF . So, I have bought 0.1μF electrolytic . Can I replace 0.01μF with 0.1μF ?

    And there is no 10K or 50K stereo VR . In the market- I am finding only 100K Stereo VR . Can I use this 100K instead of 10K or 50K ?

    Seetharaman dada please response ………

    – Digonto

  • seetharaman
    June 6, 2010

    Hi Digonto you are correcr they are not electrolytic you can use 103 & 224. A single circuit is sufficient with a good bass amplifier (sub woofer amplifier) you can get the best bass response. low frequecy portion of the audio doesn’t give you the image hence single channel is sufficient. Treble is already cut hence treble control is not required.

  • June 5, 2010

    Hello Seetharaman dada,
    How are you ? In this diagram C1, C2, C3, C4 capacitors 0.01μF and 0.22μF seems to be electrolytic capacitors . Will I find such kind of small value electrolytic capacitor easily ? If I replace the “0.01μF” with “103PF” and “0.22μF” with “224PF” then will the circuit work perfectly ?

    And this circuit is designed for Mono . If I want to use it in stereo , then will I need to make this circuit double (Bridge circuit) ? And VR 10K and 50K would be stereo .

    By the way , Can I add a treble control in this circuit ?

    Waiting for your reply ……

    – Thanks

    – Digonto

  • seetharaman
    March 21, 2010

    Hi Moses you can use this proven quality stereo tone / volume control Philips IC for tone control application. Please ensure the IC is protected from power supply surges by adding 47 ohms 1/4 watt resistance and a 12 volt 1 watt zener diode near the ic powering pins. the following is the link for the data. enjoy by assembling http://www.datasheetcatalog.org/datasheet/philips/TDA1524.pdf

  • Moses
    March 21, 2010

    Wow,thanks,I tried out the DX BASS circuit and it really worked for me. Am really grateful.
    As well, is it possible to use a TDA1524 to control the tone of audio sound?,coz I need that circuit diagram.

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