Why does the sound from the main speakers disappear when the subwoofer is connected?
Some models of powered subwoofers mute their inputs when not in use by shorting the input jack. If it is connected to a second output of the 2-channel preamp while it is off, the sound that is supposed to go to the 2-channel power amp is also shorted. If this is the case, the subwoofer should either be left on, or disconnected from the preamp when playing 2-channel material such as phono or cd. 19. How is cartridge loading set in the Phono 1, SFP-1, SFP-1 Signature, or Anthem Pre-1 and Pre-1P? The cartridge manufacturer specifies a resistive and a capacitive load impedance. If the recommended resistive load is approximately 47000 ohms, then the Rload socket can be left empty. If the recommended load is less than 47000 ohms, a load-matching resistor can be soldered into the Rload socket. A 1/4 watt metal film resistor with 1% tolerance should be used. The following formula is used to calculate Rload: Rload = Zin * Zrec / (Zin – Zrec) where: Zin = phono preamp input impedance Zrec = reco
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