There are several people here that can help. I'll see if I can find a schematic and let you know.
Crossover circuit; Hales Reference Revelation 3 speakers
Greetings everyone. I have a pair of Hales Reference Revelation 3 speakers that I love. But I recently noticed that the midrange drivers aren't even working at all. I tore one of them down to have a look at the crossover circuit, and sure enough there is a capacitor in the midrange section that is absolutely blown out. Looks like a catastrophic failure. I presume it's the same on the other side.
As for what caused this, I am not sure...but I do know that if I hit the switch on my turntable without turning my volume down, it sends a tremendous spike through the system and does NOT sound good. I think one of these spikes may have blown out these caps. This spiking began when I added a Manley 300B preamp and a Manley Chinook phono stage to my system (which is a phenomenal combo, IMO). I simply got in the habit of turning the volume down before hitting the switch to flip an album. But wouldn't mind solving that issue...definitely not right.
Which brings me back to the crossover circuits in the speakers. Basically, I am thinking it makes sense to upgrade the capacitors and anything else in there, and rebuild those circuits with better quality components. I am pretty handy with a soldering iron, and can handle the actual repairs myself....but looking for some guidance on duplicating the values designed-in for the circuit, how to best match the components in the two different circuits, etc....just looking for the best path forward. Thanks in advance for any insight or help!
-Scott
As for what caused this, I am not sure...but I do know that if I hit the switch on my turntable without turning my volume down, it sends a tremendous spike through the system and does NOT sound good. I think one of these spikes may have blown out these caps. This spiking began when I added a Manley 300B preamp and a Manley Chinook phono stage to my system (which is a phenomenal combo, IMO). I simply got in the habit of turning the volume down before hitting the switch to flip an album. But wouldn't mind solving that issue...definitely not right.
Which brings me back to the crossover circuits in the speakers. Basically, I am thinking it makes sense to upgrade the capacitors and anything else in there, and rebuild those circuits with better quality components. I am pretty handy with a soldering iron, and can handle the actual repairs myself....but looking for some guidance on duplicating the values designed-in for the circuit, how to best match the components in the two different circuits, etc....just looking for the best path forward. Thanks in advance for any insight or help!
-Scott
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- 11 posts total
Scott, a couple of things, first, since you have this apart, pull the mid and try to play the mid without the crossover connected. Lets make sure that the midrange are not damaged. Next, its about a 95% chance that the cap that burst is an electrolytic cap. So far, I have not found the schematic, but that should be a simple change. I would suggest that you get as much film as you can replacing that electrolytic and preferably a Metalized polypropylene or better. |
Thanks, Tim...those are good suggestions. I have yet to actually remove the board and have a closer look, to see if I can get a reading on the markings. There is a hand-written label on there (as there is on all of the caps) which seems to say "504". Another says "302". But I'll also see if I can find some markings. I'll also pull the other board out and do the same. I'll be sure to test out the mid-range drivers to be sure they weren't damaged, as well |
Contact Paul Hales at http://proaudiotechnology.com/. He might be willing to share the schematic since he designed the speakers :) |
- 11 posts total