Dave Plowman (News) wrote:


I very much doubt it uses anything fancy, so it would be more of a
question of getting something that physically fits. The power handling and
impedance are probably marked on the speaker. Or the power output of the
amp given in the handbook.

Isn't the rule of thumb that the impediance is about 1.5 times the DC
resistance - hence measure the good unit and multiply by 1.5?


But as Dave P says, probally not that critical here.

Pete

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http://www.petezilla.co.uk

"Peter Chant"

Isn't the rule of thumb that the impedance is about 1.5 times the DC
resistance - hence measure the good unit and multiply by 1.5?


** The ratio of DC resistance to nominal impedance for a low/mid frequency
driver is usually close to 1.2

This assume the impedance (Z) is measured at 250 to 400Hz ( where Z is a
minimum) and with low power so the voice coil does not heat.

The ratio represents the additional mechanical ( friction) losses in the
driver's suspension, eddy currents in the magnet structure plus of course
radiated sound.



..... Phil

Dave Plowman (News) wrote:


At one time, it was common to find speakers in a cloth bag - presumably to
stop foreign objects getting into the works. I have ceiling speakers in
the bathroom and did just that with them - the back of them is open to the
roof void. And I do like the bass end from a genuine infinite baffle. ;-)


Technically that is not true... Now your house is the not really infinite
baffle? :-)

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http://www.petezilla.co.uk