Ohm question regarding Diezel amps

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Vin Diezel

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I am thinking about a new cab for my D-Moll!

The Ohms have an effect on the damping factor.
Are Diezel amps designed for the use of one 8 Ohm cabinet?
How do Diezels sound (with two 8 Ohm cabs) at 4 Ohms? To bassy?

Marshalls seem to be designed to sound best at 8 Ohms, so you either have to use two 16Ohm cabs (fullstack) or get some 8Ohm speakers like Scott Henderson did.
 
The reason I ask is that I have a Diezel 212 cab (2x16ohm speakers=8 Ohms). If I add another I'll get 4Ohms. I don't know if that'll sound good... Or if the bass might get flabby...
Then I would have to change the speakers, which would be quite a hassle.
 
Damping factor is the ratio of load impedance as compared to amp output impedance. The impedance of a speaker only affects the damping factor if the amplifier output impedance is held constant. SS amps are direct coupled with a constant output impedance. However, valve amps are transformer coupled and Diezel amplifiers have multiple secondary taps on their output transformers.

On an amplifier with a multi-tapped transformer coupled output section, the output impedance is compensated by using the different secondary taps on the output transformer. This keeps damping factor constant as you use loads of differing impedances provided you're connecting your loads in a fashion that keeps the impedance matched.

Negative feedback on the other hand does affect damping factor. Marshalls use relatively little negative feedback as compared to a Diezel design. This may be why Marshalls sonically appear to sound different with different loads. However, speaker manufacturers can't even get two speakers of the same make/model/impedance to sound identical so IMHO there are too many factors in play to nail tone differences to just the different load impedance alone.
 
If I understand you correctly, it should be no problem to use two 8Ohm 2x12 cabs (which amounts to 4 Ohms altogether) as opposed to one 4x12 cab with 8 Ohms. Thank you!
 
As long as you use them on the 4 ohm jacks of the amp it should be no issue.
 
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