2. speakers
  3. 167293-162421

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
 
Hi rodman,whn everything is connected in a  one or two amp system is in use ,everything sounds great,the sound is amazing, slightly better with two power amps {obviously},but nothing is a miss,its just that it keeps blowing one amp,the one driving the mid/highs,and that is the only problem,i just cannot find out why,but every time it blows an amp,it cost me a fortune to send to Sofia about 200 miles from where i live in Bulgaria,as its the only tech i can find in the country,postage alone is £50plus the repair another £100 plus.


gregm3,iits not esay in bulgaria to find a electronic HIFI tech,,to find any tech is a job in its self,a good one is like rocking horse ..

Cheers guys Mk
fiesta75
1,378 posts
 
The testing of the mid/hi input terminals showed the caps at that end of the circuit were charging and discharging. No shorts or problems were noted in that particular test.
fiesta75
1,378 posts
 
I didn't know you were in Bulgaria, that explains the delays in communication. I think a few more tests are the only thing that is required to conclude that the issue is solved. I'm still willing to try.
fiesta75
1,378 posts
 
The fact that the speakers and amps worked of a couple or more hours is a hint that the problem may not be in the crossover. Are you SURE that when you bi-amped the speakers after getting the amp back from servicing that you didn't forget to remove the second set of cables to the low and mid/hi inputs? If the amps were connected in the outputs, even just one wire like the negative or positive between amps, that could have caused the amplifier failure.
fiesta75
1,378 posts
 
I don't believe there is a problem that exists on the crossover any longer. Let's just do a few more tests. 
More to discover