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For all intensive purposes you will be fine with the 4ohm. If you run two 4ohm in series your radio will 'see' a 2ohm load. If you intend to keep the volume above 50% most of the time you might want to use an 8ohm.
What is SWR? Is audio AC or DC? Is that 4 ohms or 8 ohms 'DC' resistance or 'AC' impedance? Will a high SWR terrify an audio chip, or cause super damage? If you connect a 4 ohm speaker to an 8 ohm audio output, is it really an SWR of 2:1?
i'm sure the audio ic will tolerate an impedance mismatch of a couple of ohms, but if your really worried about it add a 4 ohm resistor in series with the speaker, but it isn't necessary.
amplifiers be they rf or af are designed to tolerate a certain degre of mismatch and still operate with decent performance.
your cb/hf set works ok into a 2:1 mismatch. does it not?
I converted two cabinets into one with two spkrs in series and mounted two old car spkrs in the empty one in series also. Works ok but one spkr is louder than the other on each cabinet.
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