ohm difference in between same drivers

[tilroh]

I built BIBs for Fostex 166FEs a while back. One channel has always been louder than the other. I assumed it was my older amp.

I just put a digital meter on the speaker terminals (disconnected from amp) and measured:

L 8.5 ohms

R 11.8 ohms

Is that enough difference to worry about?

Thanks,
Mack

 

[Chaz H]

yeah, maybe time to slap a 3 ohm resistor onto the left channel!

 

[AndrewT]

Contact the manufacturer.
That difference is too much to be within manufacturing tolerance.

 

[tilroh]

Contact the manufacturer.
That difference is too much to be within manufacturing tolerance.

It never occurred to me to check resistance 4 years ago when I got them.

Live and learn.

Thanks,
Mack

 

[tilroh]

It never occurred to me to check resistance 4 years ago when I got them.

It also didn't occur to me to check the actual speaker, which I just did. Thankfully it's ok but the internal wiring measured 2.4 ohms each side (!?). I ran new wire from the speaker to the terminal post and the L/R sound is now balanced.... for the first time since they were built.

Arrg,
Mack

 

[fastbike1]

If your wiring was 2.4 ohms, you had some other issue.

 

[tilroh]

If your wiring was 2.4 ohms, you had some other issue.

I put the meter on the removed lengths of cat5 and each measured 2.4 ohm. The cable I unsoldered from inside the cabinet is the same as is run in between the amp and speakers. I measured these too. Each of the two 5m strands is .8 ohm.

I could see or feel any damage. I'm perplexed but the speaker no longer sounds dull.