Incident: Yesterday I was cranking (no more than normal..10 o'clock pos) on my 2 Luxman R-117's...#1 connected to my JBL 250's and pre-out to #2 running as an amp for my 240's. Towards the end of the song a massive pop and both receivers shut down then restarted before I could get to them.
Burnt smell from #1 and the right 250's woofer cone was blown out of the magnet gap and locked solid. No smell from inside the 250..crossovers weren't hot or any obvious meltdowns...all other speakers seem fine. I tried to pull the woofer cone forward and reset it in the gap..no go..so I had to cut the surround to get it back in the gap. It moved fine..no scraping...and DCR measured 6.8Ω like it did when I got it. Battery test was good.
I pulled the cover from #1 receiver...the only obvious problem is Speaker B, Right channel relay (it has 4..2 relays for A..2 for B) cover was melted. That board has no signs of overheating and everything inside the unit looks normal as well. After the incident when it was on...it was playing the 240's through the pre-out to #2 receiver fine although I did not turn it up much. I did not try switching #1's speaker B relay back on to check the left 250. It didnt blow either receivers fuses.
So what do you guys think the prognosis is? Would just the relay going out cause that..or did something happen to cause the relay to fail? Could an electrolytic cap in the xover in the 250 have failed causing a backfire of sort? Would it be wise to have the xover checked out? I was in the process of getting new caps for all the speakers but I havent made it to that point yet.
Treatment will of course be getting the receivers serviced..#1 first because #2 still works fine...but what else should I be concerned about?
Burnt smell from #1 and the right 250's woofer cone was blown out of the magnet gap and locked solid. No smell from inside the 250..crossovers weren't hot or any obvious meltdowns...all other speakers seem fine. I tried to pull the woofer cone forward and reset it in the gap..no go..so I had to cut the surround to get it back in the gap. It moved fine..no scraping...and DCR measured 6.8Ω like it did when I got it. Battery test was good.
I pulled the cover from #1 receiver...the only obvious problem is Speaker B, Right channel relay (it has 4..2 relays for A..2 for B) cover was melted. That board has no signs of overheating and everything inside the unit looks normal as well. After the incident when it was on...it was playing the 240's through the pre-out to #2 receiver fine although I did not turn it up much. I did not try switching #1's speaker B relay back on to check the left 250. It didnt blow either receivers fuses.
So what do you guys think the prognosis is? Would just the relay going out cause that..or did something happen to cause the relay to fail? Could an electrolytic cap in the xover in the 250 have failed causing a backfire of sort? Would it be wise to have the xover checked out? I was in the process of getting new caps for all the speakers but I havent made it to that point yet.
Treatment will of course be getting the receivers serviced..#1 first because #2 still works fine...but what else should I be concerned about?
But still...nothing looks abnormal or overheated to me.
