Whats the correct way to connect speakers to the four output jacks on the DR201 and DR405?
A. This is a simple question that does not have a simple answer! Some of the earliest DR201 models simply had all four output jacks connected in parallel, so there’s no mystery. Next, DR201 models with KT88s had two pairs of DR103-style jack connections in parallel. The intention of this connection was to enforce the use of at least two cabinets. In this case, you need to plug one speaker into one of the two leftmost jacks, and another speaker into one of the two rightmost jacks. If you want to use one high-power cabinet (and get around this issue), you need to insert an unattached 1/4″ plug into the pair of output jacks you’re not using to open the shorting jack connection. The later (6xEL34) 201s and the 405s used a more complicated switching setup. The four jacks are separated into two pairs, the two closest to the selector and the two further away. These two pairs of jacks are internally connected in series with each other. This provides a dizzying array of hookup options, and will
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