I think it matters if it's 4, 8, or 16 ohms.
Can be determined with just an ohmmeter, the DC resistance will be slightly less than the nominal impedance.
The worst case impedance is the DC resistance, and that determines how much AC current the audio amp
has to put out, worst case.
A 4 ohm speaker with the volume cranked up as high as it can go
on a TDA2822 running at 12v may cause the chip to overheat.
With a 16 ohm speaker the chip will likely remain cool.
Something to consider, though I don't think we have had any non-WX TDA2822's blow
due to using a 4 ohm speaker.
Seems the only reason they blow is that the WX branded parts simply can't deal with 12v,
and need that 5v regulator to feed them.
Jerry, KE7ER
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On Thu, Mar 22, 2018 at 10:43 am, Arvo KD9HLC wrote:
Anyway, for a useful approximation of a loose speaker sitting on the workbench, the resistance of the coil is close enough for most purposes.? This is because how an audio amp responds to 4, 8, or 16 ohm loads is typically the same in practicality when listening to SSB or CW.
