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
thankyou for that,some thing seems a miss,i do read 0ohms,i also found my orignal written values also this morning when i first started investigating all this, Tell you what,you guys have put so much time and effort into this,this weekend i am going to clean everything up and start again,i will take variuos readings on crossovers,re-assemble the whole two speakers and do it all again and then i will come back with a list of readings,it seems thats all i can do,i really appreciate all the help,i really do. And thank you all again Mk
where i have written" speaker terms with everything connected" ive written Hi and low, which means mid/high and bass,on the speaker posts,just to clear that. thanks guys
Tell you what,you guys have put so much time and effort into this,this
weekend i am going to clean everything up and start again,i will take
variuos readings on crossovers,re-assemble the whole two speakers and do
it all again and then i will come back with a list of readings,it seems
thats all i can do,
Something to consider:
Put the LF xover ( the 3.5mH inductor and 51uF capacitor ) on a separate circuit board to eliminate shorts from HF/MF crossover components. Better yet, upgrade to air core inductor!
imhififan - I agree on both suggestions. I just recently learned that iron core inductors are suppose to be better than air core for the bass driver due to the lower dc resistance in many cases. Tannoy is one that uses iron core on some speakers, I'm still learning... He wouldn't even need to make a PCB, he can just use point to point wiring for those 2 components and that would also reduce the dcr.
imhififan - I agree on both suggestions. I just recently learned that iron core inductors are suppose to be better than air core for the bass driver due to the lower dc resistance in many cases.
Yeah, they have lower DCR, but sometimes that DCR is quite useful as part of the baffle step compensation, and in even ordered parts of a high pass filter that DCR is again quite handy. Still, if you want massive power handling, and a very low frequency cutoff, iron core is hard to beat.
I just recently learned that iron core inductors are suppose to be better than air core for the bass driver due to the lower dc resistance in many cases.
@fiesta75 If replace a cored inductor with air core, I think it is important to use the same inductance air core inductor with very close DCR to the cored inductor, it will be bigger, heavier and cost more.
I’m still learning...
I'm as well, learning is a lifelong process.
He wouldn’t even need to make a PCB, he can just use point to point wiring for those 2 components
Lower than expected dcr for 0.22uH inductor; from what I can tell, a nominal dc resistance for that inductor is about 0.21 ohms. Think that is one area that needs some additional testing.
Correction to my post deleted. 1/Lt = 1/L1+1/L2... So yeah, dcr is about 0.05 ohms or less. Initially thought it would be about 0.68 ohms, but that was incorrect.
@likklegerry Sorry, I haven't heard from you, So you may not want my help at all, but I just started a new job. I'll be working a ton of hours for awhile. Won't be able to help. Tim
Hi Tim,so sorry i havent gotten back to you,ive been trying to to fix this problem online with another guy,but for me,my end,my laptop is very old and slow,and have been waiting to receive a new one from the UK,and it all takes time,living in Bulgaria,thank you so much or your offer,it is very much appreciated, I wish you all the luck in the world,with your new job and thank you again for your amazing offer. kind regards mk.
PM me, I'll answer when I can, but there are things to check that have not been mentioned. This can be figured out. It may well be a driver problem, if not, I can draw new crossover schematics for you with a few improvements if you can build them.
You must have a verified phone number and physical address in order to post in the Audiogon Forums. Please return to Audiogon.com and complete this step. If you have any questions please contact Support.
