Connecting Speaker Signals to Line Level Inputs
Sometimes it is necessary to connect a device which has only speaker outputs to external amplifier's line level inputs. Because speaker levels are much higher than line level signals, the direct connection does not usually give satisfactory results. That's the reason why I developed this signal level attenuator for connecting speaker signals to line level inputs without signal level problems. The circuit The circuit is designed to work with typical HIFI amplifiers where negative speaker connector (black) is connected to amplifier ground. Be careful here because some modern amps have both terminals actively driven. Connecting either one to a common reference could cause the output stage to smoke. Technical specs The circuit is suitable to be used with 1..50W audio amplifers. The circuit is connected to the speaker output of the amplifier and can be used in parallel with the existing speakers. Suitability for amplifiers: 1..50W Signal attenuation: 20 dB Input impedance: 10 kohm O...