i am using a speaker junction box to power 3 pairs of speakers (one pair being bose, the other two KLH) from a david hafler 220 amp.  it blew yesterday.   could the speaker junction box have had an effect on the speaker output of the amplifier?   twenty years ago this amp was state of the art equipment.  please respond.   thank you, capt dave 

I am wondering what the actual load was on your amplifier versus what it was rated at. 

 

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Dreaming of a new H/T system...

srothfuss:

I am wondering what the actual load was on your amplifier versus what it was rated at. 

This is a good starting point. With a speaker junction box, you'll want to know what, if any, impedance magnification is going on and what the ultimate impedance shown to the amplifier will be.

I'd also add that 20 years is a good run for an amplifier, it could have simply been it's time to go.

 

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crutchfield.com/Malcolm

Agreed.  If the speaker distribution box was a less-expensive model, it probably didn't have circuitry to keep the impedance manageable for the amplifier.  At lower volumes or for shorter periods of time, this typically isn't an issue.  It sounds like you've been using this setup for a long time.  You can test the impedance at various stages by setting up the speaker distribution box several different ways and using a multimeter to check impedance each time at the receiver end of the speaker leads.  Anything below 4 ohms, depending on the amplifier, is likely going to cause damage to it over time.

 

-Rio

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Rio28N