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testing a crossover

hi guys and girls i have a
problem with my 3 way  wilmslow-audio mirrage speakers , I am hoping you can help me with the problem,.
Lately my power amp went pop and i sent it away for repair,when i
received it back {repaired} it went pop again,on sending it back to
the repair technician ,he has come back to me ,and asked me to take
some ohms readings on the speakers, on testing the speakers , i run
these speakers using 2 power amps{Arcam Alpha 10s,using one for low
pass{bass} and the other for MID/HIGH,this is the amp which keeps
blowing,on the high /mid,on testing the terminal the bass{low pass}
read {left speaker]7.9 ohms ,right speaker bass 6.8ohms, But on the
left and right speakers hi/mid ,both read 0.0 ohms,{which we all know
is wrong}
BUT the strange thing is,when the blown amp was away,i only used one
power amp to run both speakers in bi wire config,and they worked
ok,all being a bit lack of bass and tightness,but still sound great.
So i stripped both speakers and checked the drivers,all 6 drivers
where good no shorts reading approx correct ohms for age,{Speakers
disconnected from x over}.can any one help with this,i would be so much in debt.
kind regards Mark
likklegerry
fiesta75
1,378 posts
 
pragmasi - I assume your post above was meant for me? I guess I really didn't need an answer to the last 2 sentences of my above post because I'm sure the answer is really yes, and maybe confusing to some.
You are absolutely correct about forgetting the jumpers when switching from bi-wiring to bi-amping. That could easily blow one or both amps used in a bi-amp configuration.
erik_squires
16,058 posts
 
Dude, you should have followed my advice and you'd be done by now. :)
pragmasi
212 posts
 
@erik_squires 
Dude, you should have followed my advice and you'd be done by now. :)

The best way I know of to test a crossover is to generate an impedance graph. You can use DATS V2 (or is it now up to V3) or you can build a jig and use Room EQ Wizard’s app for this.

How is that advice?.. it's not going to help anyone who doesn't already know what they're doing.
fiesta75
1,378 posts
 
erik - If you are not really going to try and help, stay out of it! Dude...
likklegerry OP
30 posts
 
Pragmasi-im really sorry,but there are no open circuits, i have closed circuits{shorts},which are the problem,surely if i have a short internal of the x-over ,before it reaches the mid and high drivers this will draw current.to be honest,i thought i knew how to test a speaker box,it seems im totally out of my depth here,which i knew,but was just asking for basic help,101 style,im no way an electronics engineer ,hobbist at most,not even that,so giving me eqations to do ,when i dont even know what the sybol mean ,is a strtch too far,its like me asking to to calculate the dwell angle and timing on a camshaft for a super charged car,if you dont know,it will take a long time to learn,i have one simple question why does the mid/high on the crossover have a short within the x-over,when the bass driver does not,im just not grasping even that,and how come there is not an ohms reading for the mid/high at the binding posts,please please excuse my ignorants,
mk
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