I want to swap the Bose SUB with an 8" pioneer that I have, along with an 8" baffle. I don't want to add an amp yet... but eventually will.

If the stock impedence is around 4-ohm, I can do a straight swap.

Has anyone measured this, or is there a manual with this info? Maybe the little SUB amp displayes it on the sticker. If anyone has removed the AMP and SUB, could you please check & let me know? I'll try to measure it with my ohmmeter in the meantime.

Thanks,
G

 

Find a voltmeter and find out yourself. I'd be really interested in the results! I cant do it because I don't have a bose system, or do my friends. If you can test it, definately post what you find out.

 

A speaker's impedance can't be measured with an ohmmeter, since it varies with several variables (such as input frequency).

You can measure the resistance of the voice coil(s) with an ohmmeter, but it will not reflect the impedance.

Any experts on this subject please chime in, I am interested to know actual details as well.

 

Took it apart - it isn't listed anywhere. I can't figure out what the impedence is, and JMF is right... tested with ohmmeter... got different results every time, all above 1-Ohm.

Anyone know the correct answer?...

Also, what is the Frequency response of that little woofer amp (or the FR of the woofer itself) ???

Thanks,
G

 

FR is generally very high with bose speakers, the speakers resistance is most likely 1ohm bose likes to use low imp speakers and woofers to pull alot of power from their amps and not allow you to replace any of their speakers withou spending alot of money, u can try putting in a pioneer, but the sound level will be very low with the stock bose amp

 

You can usually get a good educated guess using an Ohm meter and measuring the Re of the driver. For example if you took your Ohm meter and measured a resistance of 3.63 Ohm for the voice coil you would have a 4 Ohm driver. The Re is ususlly around 80% of the Z nom.

Now the only true way to measure it is to get a function generator and a 10 Ohm potentiometer. You wire the pot parallel to the voice coil and drive the speaker using a sin wave on the generator. You turn the pot until the voltage drop is even betweent the pot and the speaker. Then you unhook everything and measure the resistance of the pot.

 

If this is correct, then it should be a 1 or 2 Ohm driver, according to the measurements I got. Hm, not quite the 4-Ohms I was hoping for... Maybe I should try the replacement anyway. An 8" baffle may improve the bass response.

G

 

u could also try a dvc 8 inch so u can at least run 2 ohms to the bose amp and extract a little bit more juice than what the 4 ohm speaker would get

 

Weird Bose crap. Are you sure you had everything disconnected to the sub and you measured the voice coil. I really would have thought it would be a 4 Ohm sub.

You could always try hooking it up. The worst it will do is not make much noise.

 

Yup Dan, I measured it fully disconnected. Sometimes I'd get 6, but mostly around 1.5-Ohm. It varies alot with the movement of the sub also. I've connected my Pioneer sub to the amp before. It seemed to play ok, but I really couldn't mount it cause the pioneer 8" was a little wider than the hole in the metal plate. Plus the Pioneer requires an enclosure. Which is why the baffle comes into play. But the pioneer has a broad frequency response, and goes as high as 2KHz if I recall. I'll test it if I free some more time.

Later,
G

 

I read somewhere that it is a 1 ohm sub.