Originally Posted by icemanu
I have a Rocket Series Standing Speaker RS 450, it has dual cone speaker. My dog accidentally tipped over the standing speaker and it fell down and one of the Cone Speaker is sounding distorted - so I guess it has gone bad.
Most likely fault - a rubbing voice coil.
I had a spare cone speaker from the same company that I thought I could use to replace it; but when I opened the defective speaker I found it was a 16 Ohm one and the new spare I had is a 8 Ohm, what should I do ?
Obtain the correct replacement from the manufacturer.
1. Is it ok to replace the 16 ohm with 8 ohm one?
Usually this is a really bad idea.
(1) The 8 ohm driver will play louder than the 16 ohm driver , all other things being equal.
(2) If there is a crossover for the woofer, its response will be dramatically shifted by the lower impedance driver and the result will usually be a hole in the response curve.
(3) Since there seem to be two identical drivers, it is likely that the 16 ohm driver was chosen with the idea of two 16 ohm drivers in parallel = 8 ohms. That is consistent with a 8 ohm speaker system. If you parallel a 8 ohm and a 16 ohm the resultant impedance is more like 5.3 ohms which means that your speaker stops being an 8 ohm speaker. Your amp will probably be pretty happy either way, but no guarantees.
At this point I would say that your best work-around until the new 16 ohm driver shows up would be to disconnect and remove both bass drivers, block the hole for one of them with a board, and install the 8 ohm driver all by itself.
Putting in the 8 ohm driver in addition to the 16 ohm that is there will probably not ruin the system totally, but it is only good as a temporary work-around.
2. Only disconnect the defective cone speaker?
It will upset the tuning of the enclosure. It is an OK temporary work-around.
A reasonble short term work-around only.
On a temporary basis only.
3. Just use the new spare 8 Ohm speaker cone alone and disconnect the other 16 ohm one?
Not a good permanent move.