A single capacitor for DC blocking / AC coupling creates a simple path with one time constant. In loudspeaker crossovers the red lead should be connected toward the + terminal on the drive unit.ĭo not use bypass capacitors in the signal path. In power supplies the black lead should be connected to ground and the red lead to the + or - voltage. All of my worry about replacement tweeter(s) vanished.In signal path applications the black lead is "in" and the red lead is "out." It turned out the tweeter wasn't blown at all, it was just the cap - but I did replace all of the caps based on that one exploding. Thankfully I had the other speaker of the pair and I was able to determine the exploded cap's value from the still intact cap in the other speaker's crossover. I had to vacuum the exploded capacitor debris out of the cabinet, and none of the parts were large enough to determine its value. Well, it turned out that an electrolytic cap had exploded in its crossover, probably because it had dried out. I knew in the end it probably wouldn't match the other speaker, and I might end up having to replace both tweeters. My mind was racing early on as I knew I could never get the same exact tweeter and it was going to probably take some effort just to find a suitable replacement that would fit the hole, have the same impedance, similar response, efficiency, etc. I repaired another set of older speakers for a friend with one tweeter that wasn't working and thought to be blown. They sound great with some vintage tube equipment (also re-capped) on one of our systems. I listened before and after and there was a pretty big improvement in the sound, as both speakers were now better matched, sounded more alive, a little more transparent, and the imaging even seemed better. The new replacement caps were all within a few percentage points of their marked values. I don't think it started that way as IMFs were a very high quality speaker brand with a lot of engineering and quality control. One of the electrolytic crossover caps was over 30% off its marked value. The caps in my IMFs were almost 50 years old, and I actually did measure the ones I removed with a capacitance meter. They currently make a line of their own speakers as well, in keeping with classic BBC designs. Falcon have a history with IMF and supply replacement cap sets for the IMF line of speakers, and several other British brands of speakers. I re-capped the crossovers in a set of working IMF loudspeakers that I bought, with replacement caps provided by Falcon Electronics in the UK.
But sometimes I enjoy listening to a little bit more of a raw, back to basics, college dorm room kind of sound which is why these Advents won't be going away anytime soon : ) So as much as I like their sound they really can't match the refinement, smoothness and detail of the ADS's or the upper mid to high frequency clarity of the Ohm's. They are more nostalgic to me than anything else because my roommate in my Senior year at the University of Massachusetts had them set up in our off campus apartment. The original Advents sound very nice but in a different kind of way. While a prudent thing to do.no amount of recapping will make my original Advents rival the sound quality of myĪDS L730s or my Ohm C2s. Finally, getting your Advents up off of the floor might be a good idea as well.
#LARGE ADVENT SPEAKER CAPACITORS PLUS#
Old crossover caps were generally electrolytics which are notorious for drifting in capacitance value over time, plus drying out and going poof under power. Todays film capacitors are available in the same capacitance/voltage values and are far more transparent, plus you know they will be accurate as to their actual values. Yes, re-capping 50 year old speaker crossovers is a very good practice.
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