8 ohm vs 16 ohm

[ggunn]

Is that parallel or series?

I'll venture a guess~parallel?

The top two are in series, the bottom two are in series, and the two series groups are in parallel with each other. With four speakers, the entire array ends up at the same impedance as a single speaker.

 

[Ed Dixon]

When you cut the impedance in half, you must double the current to achieve the same voltage drop across the speaker. 25 volts on a 2 ohm load can draw almost 13 amps, enough to pop some circuit breakers. Fortunately, the amp's fuse will blow first.

Circuit breakers outside of the amp are not related to the current the amp produces. 25 volts across a 2 ohm load would draw 12.5 amps to the speakers, but that is only about 300 watts. That's not the same current as what the amp draws from the external power source. On a 110V amp that is about 2.5 amps from the actual curcuit breaker. Most home or business circuits are rated at 10-20 amps.

Amp fuzes are based on max rated load. If the amp is rated at 300W, then it should be able to produce that without problems.

An amp does not try to maintain voltage, it produces voltage. The current that results is based on the load and the voltage being produced. You turn up the volume and it produces more voltage and more watts.

Batteries can produce lots of current. Most car batteries are 12V, but the current produced when starting a V8 in the dead of winter is quite large. The ratings for car batteries are measured in amp-hours.

12V from a car battery accross a 1000 ohm resister will produce about the same current as 8 AA batteries. However put a 1 ohm load, and the car battery will keep right on ticking, where the AA cells will heat up quickly and die.

Ed

 

[Gnash5150]

can i have the celestions?

No! Two of the 75w speakers are going into a Line 6 AX2 combo, and the other two have holes in them. I will be powering the Vintage 30's with a 5150 head.