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In Reply to: RE: Room damping: they prefer lower output impedance. posted by yawg on October 28, 2009 at 13:31:50
The amps may appear to be identical, but it is unlikely that they have exactly the same gain. If you connect them in parallel, one will overpower the other and you may end up with damaged amps.
When tubes or transistors are connected in parallel to increase current capability, the designer usually has to provide some resistors in series with each separate device to balance out the currents. These are called ballast resistors. They would take away much of the benefit you expect to get from adding the extra amp.
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