testing a crossover

Got me MC. I think the repair guy missed something.. If it was to heavy a load it will pop a fuse not blow up. Must have one sorry protection circuit.

TWICE. I don’t think so.. It’s the amp or PC or RCA or something exclusive to THAT amp..

The input to the amp?

It should pop a fuse if it’s on the output side, like a speaker issues, usually.

All I know is neg to neg and pos to pos = 1/2 the two numbers added together. 8 ohm top + 6 ohm bottom = 14 ohms /2 = 7 ohms

Running neg to pos, to neg to pos, combines the two. 6 ohm bottom + 8 ohm top = 14 ohms.

8 -14 ohms loads on my valve amps are just perfect. They run a LOT cooler and clear as a bell all the way to 100% volume..

I’m likin’ the bass at 8-12 ohms better too, with BIG class d amps. They are 12K amps. 1700 x 2 all day long at 12 ohms bullet proof. Dirt cheap!

Get a Behringer NU12000 (NO DSP) move your other amp to the top. Be happy for 400.00 and 10 years.. I disconnect two of the 3 fans and put the last one on a switch. Perfect.. DEAD quiet.. or hook it to 10-12 18" subs.. It will push EVERY one to 120 db.

I'm thinkin' 4 new 21" Dayton's with 8 18" passives would be a good bass system .. :-) I like a room that can tenderize meat in a pinch.. :-)

    Wilmslow Audio built some fairly complex crossovers, for some of their systems, though I’m not familiar with the Mirage’s.                                                                                   A DMM can easily read impedances, through the inductors in a woofer’s series circuitry.     The capacitors in mid/tweet series circuits are another story.                              I could (easily) be wrong, but: I’d put my money on the speakers/crossovers being OK and something in the amp, or cables/connections: the culprit.

I have a love/hate relationship with puzzles like this. On the one hand I love em because it is nice to think they can be solved if only you know enough. On the other hand I hate em because you never can be sure you are getting the whole story. Like, one train leaves at 30mph, another at 40, how many painters does it take to earn $40?  

In this case I can't help wondering, how on Earth did two speakers go bad at the same time? In other words maybe zero ohms is a red herring. No trains left the station. Three buckets of paint, and the waitress earned a $40 tip?

The formula for parallel resistance is 1/Rt= 1/R1+1/R2+1/R3....  
https://www.electronics-notes.com/articles/basic_concepts/resistance/resistors-in-series-parallel.ph...

Since he measured almost 8 ohms then the total resistance will be 1/8 ohm + 0 ohm or 0.125ohm.  

If any one or more of the paralleled resistor is 0 ohm, it is a short circuit and the total resistance should be 0 ohm.

The correct formula for two resistors in parallel is Rt = r1 X r2 /(r1+r2)