Quantity   Component name
2 × Marshall Stanmore Speaker Bluetooth speaker with broken electronics but working drivers and good exterior
1 × Marshall Acton Bluetooth speaker with broken electronics but working drivers and good exterior
1 × Speaker impedance measurement cablr Cable to measure the input impedance response using a computer sound card and REW
1 × Sound card loopback cable Cable to calibrate the computer sound card
1 × Dayton Audio iMM-6 calibrated microphone Device to measure the speaker sound pressure levels