[sdiy] inductors, B fields, and confusion

[Scott E.]

Magnus,

Now you have my curiosity. Under what circumstances would you consider 8 
ohm speaker drivers a poor choice? There are two cases to consider:

1. Drivers in a passive system where the amplifier is loaded by the 
crossover circuit and

2. Active systems where the driver is directly connected to the 
amplifier, having an electronic crossover prior to the amp.

In the first case, the amplifier probably has a more difficult load. 
Particular care must also be made by the crossover circuit designer to 
bring proper impedance considerations to the design, both input 
(amplifier loading) and output (to the speaker). In this case I can see 
no difference in selecting, say a 16 ohm driver over an 8 ohm drive in 
that both the driver and the circuit will be known quantities.

In case 2, there certainly could be issues with amplifiers not liking 
too low of an input impedance (speaker), but I would think the load 
presented to the amplifier would be a drive load handled by the amp more 
easily that a crossover circuit.

Regards, Scott Evans
============================================================
Magnus Danielson wrote:
> Don't be supprised to have me delivering a full explanaition on why
> specifically 8 ohm drivers is the ultimately bad choice! ;O)
> 
> Actually, I just got the hunch that something was terribly wrong so I embarked
> on this exercise without for sure knowing the answer. This happends from time
> to time. This time I was able to prove it fairly quickly. Sorry for the
> ASCIImatics...
> 
> Cheers,
> Magnus