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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
likklegerry OP
30 posts
 
i am using internal xo,which came with the speakers
all tests done with power amps disconnected.
the problem{ going pop{broken}only happens when the speakers are driven in bi-amp config,and its the amp which is driving the high/mid drivers that blows up .
when using only one amp,in bi-wire config,everything works,all be it the sounds quality is slightly off,but i would have thought that to be ok,that why i bi-amp,for better sound quality.
to add to this,i changed out the xo caps for better ones two years ago,and after fitting them ,i tested the input speaker terminals for the correct ohms reading and all was good,but something has changed.
regards Mark
likklegerry OP
30 posts
 
i would also upload some photos, but as this is my first ever use on this site,im not sure how to do this, any help appreciated,
mark
fiesta75
1,378 posts
 
I would like to help as I'm an avid bi/tri-amper. I would guess you've checked the cables and wiring to the amp and speakers? I don't know anything about the crossovers in the speakers, is it possible to draw a schematic or shoot some photos? I use an active crossover at the inputs of my amps to limit the frequency range to each driver, tri-amping. Nothing but wire between the voice coils and amp outputs. This configuration virtually eliminates intermodulation distortion, which is most offensive to the ears. I've been bi-amping for 44 years and tri-amping for 41 years. Might be as simple as bad caps in the crossovers you are using. If you would like, I could send a PM to you with my email and you could send me a schematic or photos of your speaker crossovers. I'm positive we can get to the problem without much effort. 
imhififan's avatar
imhififan
2,211 posts
 
i would also upload some photos, but as this is my first ever use on this site,im not sure how to do this
Go to Virtual Systems page, use the "Create System" to upload photos.

https://systems.audiogon.com/
likklegerry OP
30 posts
 
that all sounds fantastic Fiesta,ill get on that today,taking photos,ill try draw a schem.but its difficult, but ill do my best,thankyou so much for your help here,its so much appreciated,im sure its some thing simple in the xo,but i cant see it,but it strange how both have gone the same way,caps where all changed out 2 years ago,but ill test them all again.
kind regards
Mark
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