If you don't want to use the headphone jack, connect your amplifier to the Right, Left and Ground pins. These are line level outputs for headphones of about 30 ohms, not for big speakers! There are output DC blocking capacitors so you can safely connect directly to any kind of amplifier | If you don't want to use the headphone jack, connect your amplifier to the Right, Left and Ground pins. These are line level outputs for headphones of about 30 ohms, not for big speakers! There are output DC blocking capacitors so you can safely connect directly to any kind of amplifier |