Hi-Fi DX Bass circuit


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.

Show Comments

37 thoughts on “Hi-Fi DX Bass circuit

    • Seetharaman

      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.

  1. James

    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 :)

  2. Seetharaman

    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.

  3. prudencio g. peritos jr,

    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

  4. seetharaman

    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

      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

  5. seetharaman

    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.

  6. kamalakannan

    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.


  7. Seetharaman

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

  8. pranshavs

    Yes, I’ve placed it between preamp and an amp. These are the links to the images of my build,





  9. Seetharaman

    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.

  10. pranshavs

    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.

  11. seetharaman

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

  12. Digonto

    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 ?

  13. seetharaman

    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

  14. Digonto

    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 ?

  15. Digonto

    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

  16. seetharaman

    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.

  17. Digonto

    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

  18. Moses

    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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