Series would be safer than parallel, which indeed would lower the impedance of the two, likely to a point below that which the amplifier is designed to operate.

Sounds like that tech has "been there, done that" -- and is speaking from experience. What he told you sounds right to me.

Just be sure that you wire the series in phase properly.

Amplifier(+) -> Main Speaker(.)+

Main SPKR(-) -->Tweeter(+)

Tweeter(-) -->Amplifier(-)

Note that in the middle there is one wire going from a minus (-) terminal to a plus (+) terminal here. Series.

If each device in this series wiring is 4 ohms as stated, then the total load would become 8 ohms at the amplifier terminals because series is addition, just add all the impedances in the series string up to arrive at the total.

It should work, but be advised that it is not what I'd call a clean arrangement in the sense that the tweeter circuit may (or may not, depending on how it's crossover is derived) affect what the woofer is getting. Hook it up and give it a listen. If it sounds good, it IS good.

--Mac

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