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  3. 195115-94506

Changing out 8?ohm for a 4ohm...

I've got an old pair of 3 way speakers (Avance Epsilon 980) rated at 4ohms and 89db sensitivity. (4) 7" ScanSpeak drivers #8544-09. Now, I thought the number designation on ScanSpeaks means that '8' stands for 8ohms. If so, how can they be 4ohm speakers? But my real question is: I have a chance to pick up 2 new ScanSpeak Revelators that I know are 4ohms, for a really good price. So, can I trade out just the mid woofers in these for the Revelators without screwing anything up, specifically the Revelators? Also Revelators are 92db. Bad idea? Feasible?

Amp can handle 4ohm loads no problem.

thecarpathian
thecarpathian's avatar
thecarpathian OP
5,203 posts
 

@mulveling ,

Thank you for the insight.

 

ckr1969
143 posts
 

if you change the drivers from 8 to 4 ohms you change the network frequency, you can't do that, it will sound awful

thecarpathian's avatar
thecarpathian OP
5,203 posts
 

@ckr1969 ​​@mulveling ,

Can you guys tell me how they can be 4 ohm 3 ways if the bass and mids are 8 ohm drivers?

viridian's avatar
viridian
5,365 posts
 

The formula for determining the impedance of any speaker with parallel drivers is: 1 / (1/Z1 + 1/Z2 + ... + 1/Zn), where Z1, Z2, etc. are the impedances of the individual drivers. 

thecarpathian's avatar
thecarpathian OP
5,203 posts
 

@viridian ,

That may as well be Egyptian hieroglyphs.

Can’t I somehow just use a multi meter?

Maybe better to leave well enough alone...

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