Thanks, Mofi. And your questions are good ones. BTW, I myself learned about this issue with certain ICEPower class D modules (which as I indicated may or may not pertain to the Peachtree 220) just a few months ago in this thread.
A passive speaker won't care about the DC, because to a very close approximation it is present equally on the + and - terminals, and thus it will not cause any current to flow in the speaker. However a powered sub will typically connect its negative input terminal to its circuit ground, which will typically be connected to its AC safety ground through a low impedance, which in turn will be connected to the amplifier's AC safety ground through the AC wiring, which in turn may result in a near short being applied to the large DC voltage on the amp's negative output terminal. The result potentially including damage to the sub, the amp, and the listener's ears.
Also, connecting the sub's negative input terminal to a ground point on the amp, as is often done when connecting powered subs to amps having balanced or bridged outputs (i.e., amps having signals on both their + and - output terminals), would not be a solution in this case because with the sub's - input terminal being at zero volts the sub would then be subjected to the huge DC voltage on the + terminal.
My understanding is that those ICEPower modules were used by a significant number of different amplifier manufacturers. As indicated in the thread I linked to, adapters incorporating capacitors to block the DC were and perhaps still are available for connection of powered subs to those amps.
Best regards,
-- Al
A passive speaker won't care about the DC, because to a very close approximation it is present equally on the + and - terminals, and thus it will not cause any current to flow in the speaker. However a powered sub will typically connect its negative input terminal to its circuit ground, which will typically be connected to its AC safety ground through a low impedance, which in turn will be connected to the amplifier's AC safety ground through the AC wiring, which in turn may result in a near short being applied to the large DC voltage on the amp's negative output terminal. The result potentially including damage to the sub, the amp, and the listener's ears.
Also, connecting the sub's negative input terminal to a ground point on the amp, as is often done when connecting powered subs to amps having balanced or bridged outputs (i.e., amps having signals on both their + and - output terminals), would not be a solution in this case because with the sub's - input terminal being at zero volts the sub would then be subjected to the huge DC voltage on the + terminal.
My understanding is that those ICEPower modules were used by a significant number of different amplifier manufacturers. As indicated in the thread I linked to, adapters incorporating capacitors to block the DC were and perhaps still are available for connection of powered subs to those amps.
Best regards,
-- Al