DFPlayer mini popping when driving 2 speakers

#include "SoftwareSerial.h"
#include "DFRobotDFPlayerMini.h"

SoftwareSerial mySoftwareSerial(10, 11); // RX, TX
DFRobotDFPlayerMini myDFPlayer;

int buttonPause = 12;
byte oldSwitchState = HIGH;
boolean isPlaying = false;
int count = 0;
int songNumber = 1;
int totalSongs = 5;
int value = 0;
unsigned long lastDebounceTime = 0;
unsigned long debounceDelay = 50;
int buttonState = 0;
int lastVolume = 0;

void setup() {
    pinMode(buttonPause, INPUT_PULLUP);
    //digitalWrite(buttonPause, LOW);
    
    mySoftwareSerial.begin(9600);
    Serial.begin(9600);

    delay(500);

    Serial.println();
    Serial.println("DFPlayer Mini Demo");
    Serial.println("Initializing DFPlayer...");

    if (!myDFPlayer.begin(mySoftwareSerial)) {
        Serial.println("Unable to begin:");
        Serial.println("1.Please recheck the connection!");
        Serial.println("2.Please insert the SD card!");
        while (true);
    }
    myDFPlayer.setTimeOut(500);

    //----Set volume----
    myDFPlayer.volume(10); //Set volume value (0~30).
    
    //----Set different EQ----
    myDFPlayer.EQ(DFPLAYER_EQ_NORMAL);
    myDFPlayer.outputDevice(DFPLAYER_DEVICE_SD);
}

void loop() {
  byte switchState = digitalRead(buttonPause);
  value = analogRead(A2);
  value = map(value, 7, 1023, 0, 25);
  if(value != lastVolume){
   myDFPlayer.volume(value);
   lastVolume = value;
  }
  
 if(oldSwitchState != switchState){
    lastDebounceTime = millis();
  }

   if ((millis() - lastDebounceTime) > debounceDelay) {
 if(switchState != buttonState){
  buttonState = switchState;
    if (switchState == LOW) {
            myDFPlayer.play(songNumber);
            Serial.println(songNumber);
            if(songNumber>=totalSongs){
              songNumber=0;
            }
              songNumber++;
        }
      }
   }
   oldSwitchState = switchState;
}