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Unlikely that anything will blow up, but the amp will struggle to provide enough current to drive both sets of speakers cleanly, at least at anything above very low volume.
That increases risk of damage to speakers.
Best solution is to get another amp, and use one amp per set of speakers, with switching on the input side.
ChasnotRobert
nonowt
potentially daft question:
I have an old A&R A60 amp running some Wharfedale Diamond 7.1 speakers. I'm wanting add another set of speakers for the kitchen. QED do a switch box which theoretically should allow this. The amps manual says "outputs are designed for driving speakers of 8 ohms nominal impedance or higher. 4-8 ohms speakers can be used where marked as such. 4 ohms speakers can be used but not a high volume."
The switch box says "Minimum Load Impedance - 4 Ω (Using Two Pairs of 8 Ω Speakers)."
The diamonds are 8 ohms but the cheap Mission LX1 i'm thinking of getting are 6 ohms. What I need to know is - if I run them both through the QED switch box will anything blow up?
I think not but as I don't actually understand any of the information I've written above -any confirmation or warning would be great.
thanks!