From: Amp question

[rodolfo28 0]

There isn't much too it really.

There is a magnetic field generated by the coil. The more the current flows in the same direction through the wire in the coil, the greater the magnetic field. The greater the magnetic field, the more the cone moves. You could break the coil into infinite sections (like dual or quad coils for example) and feed each section current, as long as the current is going in the same direction (amplitude does not apply in this equation) it builds the magnetic field, it builds it additively.

That's about it really... The voice coil windings can't "fight each other" because there is only one magnetic field generated, not two or more fields... If there are different phase relationships you will have cancellation, that is it. But that isn't ever the issue with matching different drive levels... The cancellation only lowers efficiency anyway. It doesn't cause overheating (we are talking only a few degrees of phase here) or anything wierd.... You won't ever have serious phase issues anyway, unless your equipment is broken. Even then, it still won't cause any damage unless you seriously try to....

People have made this up. Nobody has ever blown a subwoofer any faster because of different driver levels to individual coils.

Thanks for that info man! So it I have 2 amps a RF 200.2 and a 225.2 ( The old punches, the first makes about 400 watts and the latter about 450). Do you think it would be ok to hook them up each at a voice coil of a dual voice coil sub?