Max speaker wattage?

[grumpy]

The 60 watter (30w into 16 ohms) should be plenty, even if you goose the bass a bit.

[BudM1930]

I thought the 16 ohm for the D130 was established when I found a piece of literature in my file stating it was 16 ohm.

Did some searching of past posts in this JBL thread looking for more info on the D130. Was surprised by a posting dated 1/28/12 by claytushaywood entitled JBL D130 Impedance and cone question.

In that post, three responders replies would indicate that the D130’s prior to 1966 ( era of my two speakers) were really 8 ohms. If that is true, my amplifier wattage problem is resolved. Comments would be most welcome.

Thanks
BudM

[grumpy]

Impedance can be stated as 'nominal', minimum... or shown as a plot vs frequency such as



Which was claimed to be a D130 in a ported box, and would tend to support a 'nominal' 8-ohms as reasonable.
For a single speaker (no crossover), and solid state amp, the point is somewhat moot...
a 60w (into 8 ohms) amp should be plenty. If 85w floats your boat for whatever reason, it will not hurt anything
any more than overdriving the 60w amp would (e.g., turning the bass way up and expecting the system to
play subwoofer frequencies).

[BudM1930]

Thank you Grumpy

One final question.
I have a new multimeter. One setting is ohms. Searching the web I understand that I may be measuring DC ohms, and that AC ohms may be somewhat higher.

Made several tests on each unconnected speaker at their outside terminals. Left speaker (#2) was constantly at 9.3 ohms. Right speaker (#1) was constantly at 6.2 ohms.

This appears to indicate that both the speakers are 8 ohm, and not 16 ohms. Comments would be appreciated.

Thanks
BudM

[Mr. Widget]

A digital multimeter will typically only measure DC resistance. The DC resistance of a speaker is almost always significantly lower than the nominal impedance. A DC resistance measurement of 9 ohms is typical of a 16 ohm woofer, The 6.3 ohm woofer may very well be an 8 ohm woofer, in any case if you are not planning on adding tweeters and you're just going to run these woofers as they are, I really wouldn't worry about it. It just won't matter what the impedance is. You may need to adjust the channel balance between the two as the one with lower impedance will play louder at the same setting.


Widget

[BudM1930]

Decision time:
Have decided to go with integrated amplifier model A-S301 by Yamaha.

1) Has slightly more power than my failed amplifiers
2) While connecting posts are not marked on my speakers I am assuming black wires are ground and colored wires are Positive. So on my speakers that would be left contact is ground and right contact is positive.
3) While it is still not clear if my two JBL D130 speakers are 8 or 16 ohm, and this amplifier’s max is 8 ohms - so I am going to assume the extra amplifier power is more than enough.
4) I am not planning to add any additional speakers at this time.

I will advise how it turns out after I get it all up and running.
Thanks to all for your comments and patience.

Regards
BudM

[BudM1930]

Hello again

My new amplifier has been installed.
It was a good choice.
Only issue is volume. Range on dial is from 7:00 to 4:00.
Above 10:00 sound is so loud you can not stand it.
So, I will need to watch the volume control carefully.
Everything else is above expectations.

Thanks to all that helped me through this need.
I will be enjoying my great JBL speakers for years to come.

Regards
BudM

[grumpy]

Glad you found something that will work and let you listen.