| Threshold S/500 Series II optical bias and Wolcott Presence on Sound Labs | somut | 2711 | 5 |
| Can a variac be used to maintain constant voltage? | dhl93449 | 6354 | 16 |
| Amplifier power versus maximum speaker input power | roscoeiii | 5610 | 13 |
| Conrad Johnson Motif MC-7 | stanwal | 2596 | 1 |
| Perreaux Preamps | jafant | 10923 | 13 |