It does appear to be series but it's not. If it was in series, you wouldn't have sound in the first cab if you unplugged the last cab. It would be a nightmare to wire cabs in series.
You could run directly to the amp from each cab, but then you would have two 16 ohm loads to plug into an amp...
Make sure your new cab has at least two jacks. They'll be marked in/out or parallel or something like that depending on manufacturer. Stereo capable cabs can have two or four.
You're going to need another speaker cable. One cable out of the amp, into the first cab, second cable out of first...
Here's what I would do.
Rewire your cab with the two 8s in parallel giving you a 4 ohm load. Jack into the 4 ohm speaker out. I would say it's going to be your best option right now.
If you go and get another 2x12 down the road, look for 8 ohm speakers. Reverse the wiring in your original cab...
I stand corrected. More like 3/4 the weight. No big deal if you never have to move it.
I own a Single Rectifier Solo Head and a Roadster Head, but I did spend a weekend A/B-ing with a Dual before I bought the Roadster (48lbs.). They each have their own personalities that's for sure. But if I...
To my ears, the Single sounds airy and open compared to the Dual, but when I stomp on the Tubesceamer, the Single sounds more compressed like the Dual.
The Single really shines when it's time to move it. It's half the weight.
A "power surge" is a "voltage spike" by definition.
Having the electricity suddenly return doesn't necessarily create a spike, but I think the caps in the power supply will smooth them out.
If the hum is consistent regardless of guitar position or orientation then the hum is coming in on the power cord and a power conditioner will help.
If it's an electromagnetic field and it's coming in your guitar cord, then you can buy the best power conditioner on the planet and it'll be...