4 ohms vs 8 ohms

[PBGas]

Hi Gents,

On my Diezel 2x12 FL, it has the 8 ohm load with (I think?) the 2 x 16 ohm Diezel Eminence speakers. I'm thinking of changing to another speaker though at this time. My new speakers have would have an 8 ohm rating each and that means that they would be wired to be at 4 ohms for the cab.

Now, I know my Einstein has no issue running that at all. Is there generally more wear and tear on the amp at 4 ohms as opposed to 8 Ohms? I'd imagine so but I'm wondering if others run their Diezels at this ohm rating as well.

What are some of your fellow Diezelites running yours at?

Thx in advance for the help!

Paul

 

[reussen]

more wear because of 4 ohms?

I've never heard that before.. I always thought you should just make sure your amp and speakers are the same load. But I know nothing about electronics..

 

[steppenwolf3080]

The ouput transformer steps down the highish impedance from the output tubes down to low impedance to drive the speakers. The 4/8/16 Ohm taps on the OT make sure that the output tubes "see" the right load through the transformers no matter if you use 4/8 or 16Ohm speaker. That's why it has those tabs...
Using it on 4Ohms wont wear the tubes or OT more then using other settings. Important is just to match the right tab with the right load.
On 4Ohms the secondary of the OT should run at higher current but lower voltage compared to the 8Ohm(16Ohm)
But if multiplied, the wattage remains the same so you can deliver the same power to the speaker.
The OT is build for that!
What makes a difference:
If you have a 2x12 cabinet and let's say two 8Ohm speakers. Wiring them in series will give you 16Ohms, in parallel 4Ohms.
Both sound different, especially if you use different speakers.
Best,
Stefan