My guess is that Ibanez was trying to get by with a cheap dual VC speaker instead of using a high quality, high sensitivity, single-VC 8-ohm speaker that would handle 150 watts or more. That seems like a recipie for weak performance.
When an external speaker is connected, the internal speaker would have to operate with one voice coil while carrying the cone weight of a dual VC speaker. This Class-D amp offers more than just reliability. Designed for working musicians, the newly redesigned P3110 is the perfect fit for traveling from venue to venue. Its 300W of muscle in one lightweight package. I don't see much advantage to this configuration unless the dual voice coil internal speaker is something pretty special. With output power up to 300W, Promethean bass combo amps pack a huge sound along with their smaller, made-for-travel size. What is not shown, which makes the schematic look totally wrong, is the lack of a negative / return path from the speaker back to the amp. The amp has a 4 ohm load when connected to both 8 ohm voice coils of the internal speaker, or one 8 ohm voice coil of the internal speaker and one 8 ohm voice coil of an external speaker. Splitting the output signal into two pathsallows connecting the amp to two 8-ohm voice coils in parallel, yielding a 4 ohm load. One of those paths routes through a switched external speaker jack on its way to one of the internal speaker's voice coils. It appears the drawing is trying to show that one (1) output from the amp is split into two paths, each attached to a separate voice coil in the speaker. The amp is putting out a single 300 watt max signal. The amp is not putting out two 8 ohm signals. Click to expand.Pretty much has to be a dual voice coil speaker, each coil being 8 ohms, in which one of the voice coils is replaced by an external speaker's voice coil when an external speaker is connected to the extension speaker jack.
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