>>>Take a 1.5 AA cell and two connecting leads; connect the + and - of the
>>>cell to the loudspeaker terminals; you'll hear a small "pop" and the
>>>bass driver will move slightly, either forward or backward. The drivers
>>>of both speakers should move in the same direction when the polarities
>>>are matched.
>This is the procedure I've use many times, to check speakers. I usually
>find a 9V battery works better though.

9V !!!???

Quick check:

9Volts into 4Ohms -> 2.2Amps
2.2Amps @ 9Volts -> 20Watts

That'll be "20Watts RMS" or "26Watts peak-to-peak" or "about 1'300Watts PMPO"

So 9V would kill most desk-top speakers, but work well with stage kit.

>>>Ithink only relative phase between the two speakers matters, i.e. if you
>>>reverse polarity in both speakers that shouldn't mater.
>Yep.

Depends on your speakers.

If you just have a cheap cone with two wires - meh.
If you have isodynamic speakers or a cross over or one of many other things
- it WILL matter.
I know hifi purists who are convinced they spent good money on SPEAKER
CABLE that has a right and a wrong way around.

BC

_______________________________________________
http://cool.haxx.se/mailman/listinfo/rockbox
Received on Sat Jun 4 18:50:37 2005