I am trying to replace a 2 channel speaker with another 1 channel speaker. To do so, I connected every wire (+ & -) to a resistor, then connected both -ves and +ves together (I read how to do it somewhere). I tried doing this on a breadboard first, and it worked well, the sound and volume were good. But then when I connected the resistors directly to the wires (without the help of the breadboard), the volume somehow decreases, even though the rest of the circuit did not change. The volume is the same as when I connect only 1 channel to the speaker. I do not know why this is happening and would really appreciate some help.
I tried coiling the resistor around the wire and removing the coils but no changes happened. I tried both channels separately and they both work, so that rules out any fault with the connections or wires. The circuit is currently connected on the breadboard, just the resistors are directly connected to the wires so there is no doubt that this is the problem.
This is my first time playing around with hardware, so excuse any possible stupidity :) Thanks in advance!


simulate this circuit – Schematic created using CircuitLab

The circuit on the breadboard, note that the volume is high, and the quality of the sound is perfect (working as expected) (white is +ve and black is -ve):
[![Circuit on breadboard][1]][1]

Connecting the resistors with the wires using electrical tape and without changing the circuit (volume decreases for some reason, becomes like when connecting only one channel):
[![Connecting the resistors with the wires using electrical tape and without changing the circuit][2]][2]

  • \$\begingroup\$ Welcome to EE.SE. A schematic is better than words. You can add one in using the CircuitLab button on the editor toolbar. Double-click a component to edit its properties. 'R' = rotate, 'H' = horizontal flip. 'V' = vertical flip. Note that when you use the CircuitLab button on the editor toolbar and Save and Insert on the editor an editable schematic is saved in your post. That makes it easy for us to copy and edit in our answers. You don't need a CircuitLab account, no screengrabs, no image uploads, no background grid. There are symbols for resistors and loudspeakers. \$\endgroup\$
    – Transistor
    Commented Mar 12, 2022 at 11:03
  • \$\begingroup\$ I'm sorry about that :) It is a very simple circuit though, theoretically it should work. When I connected the circuit on the breadboard, it worked perfectly. But then when I connected the resistors to the wires from the channels with electrical tape, the volume decreases. The rest of the circuit is exactly the same, so I am wondering if there is a "correct" way to connect resistors to wires, or if I am missing something bigger. \$\endgroup\$
    – yH20
    Commented Mar 12, 2022 at 11:19
  • 3
    \$\begingroup\$ There is no theory which indicates it should work, because you don't say which device, module, or chip you are using and if it works in a way that won't allow you to connect the outputs together with resistors. Besides if your speakers are typical 8 ohm devices, any amount of resistance in series will make it less loud, and adding 44 ohms in series with 8 ohms is a lot. \$\endgroup\$
    – Justme
    Commented Mar 12, 2022 at 12:16
  • \$\begingroup\$ Show us a couple of pics of what you've actuality built, both with and without the breadboard. \$\endgroup\$
    – brhans
    Commented Mar 12, 2022 at 13:07
  • \$\begingroup\$ Please expand your schematic to include the speakers, their impedance and your amplifier. \$\endgroup\$
    – winny
    Commented Mar 12, 2022 at 15:01

1 Answer 1


Your circuit is built wrong. The resistors in the first picture are all shorted out by the breadboard. So it is a different circuit from your second picture where the current actually flows via the resistors.

  • \$\begingroup\$ had to look up why it was shorted out and I finally get it.. total noob mistake lol.. thnk u \$\endgroup\$
    – yH20
    Commented Mar 12, 2022 at 17:19

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