On 1/05/2016 11:18 PM, Dave Plowman (News) wrote:
In article ,
Phil Allison wrote:
They can also include a circuit to make them drop out if they detect a
large DC offset. Very good way of protecting speakers in event of a
fault.



** Few speaker relay systems provide reliable protection if that happens
- nor do they claim to.

I'm talking about those which do.

The simple fact being that the kind of relays used are only capable of
switching *off* DC voltages to a maximum of 30V at rated current. IOW,
their current breaking capacity is very limited for DC voltages.

Then use a relay fit for purpose. Fraction of the cost of a speaker repair.


**High Voltage (30 VDC) DC relays are quite expensive. Certainly more
expensive than mid-range bass drivers.

http://uk.farnell.com/te-connectivit...20a/dp/1386559

You STILL haven't told us the brand and model of the amplifier. Failing
that, you could point us to a schematic.

--
Trevor Wilson
www.rageaudio.com.au

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