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Author Topic:  Webb ohm question
Greg Readling


From:
North Carolina, USA
Post  Posted 2 May 2019 6:18 am    
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I’m playing through a Webb with a 4 ohm JBL K-130.
I’m thinking of adding an extension cabinet that has a 4 ohm JBL E-130 to the amp.
The Webb says it can handle down to 2 ohm load. Does said combination equate to 2 ohm load? What are the ramifications of this choice vs. (2) 8 ohm speakers instead?
What would you expect tone differences to be between (2) 4 ohm speakers and (2) 8 ohm speakers?

Thanks,
Greg
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b0b


From:
Cloverdale, CA
Post  Posted 2 May 2019 6:40 am    
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Yes, 4 ohms + 4 ohms in parallel = 2 ohms.

Regarding tone, the K-130 magnet is alnico and the E-130 is ceramic. Different sounds.
Dave Grafe wrote:
As for the different magnet materials being responsible for different speakers having "absolutely not the same sound" my experience supports the scientific data, i.e. I've two identical 200W amps, one with a K130 and the other with an E130, both of them get hammered on constantly, recording with the former and performing with the latter, and the same settings appear on both in order to deliver "my" sound at the required volume, regardless of which speaker is loaded.

The notable difference in performance is that the more efficient E130 delivers lots of high end and exposes small EQ adjustments more than a less efficient driver would, which has led some to conclude that the speaker itself sounds entirely different.


(quoted from https://bb.steelguitarforum.com/viewtopic.php?t=264585)
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Greg Readling


From:
North Carolina, USA
Post  Posted 2 May 2019 7:01 am     Webb
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That’s good info. Thank you.
Regarding practical tonal differences between 4 and 8 ohm
Speakers that are identical in every other way, are there any?
Would one be smoother than the other?

Greg
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b0b


From:
Cloverdale, CA
Post  Posted 2 May 2019 8:08 am    
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It's to match the impedance of the amp's output circuitry. Go too low and the amp will work too hard and blow up. Too high and it can't push the speaker.
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-𝕓𝕆𝕓- (SGF Admin) Robert P. Lee β™ͺ @b0blee β™ͺ Copedents β™ͺ Recordings
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