sheldon Posted June 3, 2006 Share Posted June 3, 2006 Hi, I've got problems with 2 of my NEXO PS15s which I find peculiar, so I thought I'd check if anyone knows what's going on. Last week we lost the LF on one cabinet, and today while checking it, I notice the 10A fuse on the crossover was blown. When replacing it, the holder sparked (!) and a 'pop' was heard from the HF. The LF driver is dead, but seems like the crossover is also having some problems, anyone know what might be wrong ? The 2nd cabinet seems to work fine, until I turn up the lows pretty loud, then it starts distorting (kinda like a popping sound). If I bring the lows down, or the level down, the popping remains, till I turn off the level, then when I start it up again it sounds okay, BUT it'll start to pop again when the level goes higher. Funny thing is, I decided this cabinet should go off to the dealers for repair, and unplugged it. I'm certain I heard a pop AFTER I unplugged the speaker cable, would that indicate any kind of problem with the crossover ? Hoping someone with a little more experience on the PS15s could give me pointers where to look before I send in the cabinets (the service charge and recone is quote expensive, I don't want to recone if the problem doesn't lie with the woofer) Thanks all, Sheldon Link to comment Share on other sites More sharing options...
mackerr Posted June 3, 2006 Share Posted June 3, 2006 Last week we lost the LF on one cabinet, and today while checking it, I notice the 10A fuse on the crossover was blown. When replacing it, the holder sparked (!) and a 'pop' was heard from the HF. The LF driver is dead, but seems like the crossover is also having some problems, anyone know what might be wrong ?What crossover? Nexo PS15s are a biamp only speaker. They need seprate amplifiers for the lows and the highs. They must also be used with the Nexo controller, which includes driver protection. From your post it sounds like you are trying to run them passive without the controller. If so, this is why you are blowing them up. A more complete description of exactly how you have your system wired would help make it easier to figure out your problem. Mac Link to comment Share on other sites More sharing options...
sheldon Posted June 3, 2006 Author Share Posted June 3, 2006 Hi Mac, No offense, but maybe you need to get your facts right first. While the NEXO PS15s are bi-amp capable, most people run them passive, since there is not much improvement bi-amping them. In fact, the bi-amp connector comes from the factory fitted with a cover so you can't plug in a NL4 connector. The processor (PS15TD) is a stereo passive, with mono sub out. If you want to do bi-amp, you need to open up the processor and move some jumpers, leaving you with a mono unit (One channel becomes the HF, one channel becomes the LF). www.nexo-sa.com for more info. Our system setup is quite simple, mixer outs to EQ, output to the NEXO processor, out to the amps, then a sense return cable from the amp output back to the processor. The speaker cables get routed to a front panel connector for convenient and fast setup. Hope this helps. Sheldon Link to comment Share on other sites More sharing options...
mackerr Posted June 3, 2006 Share Posted June 3, 2006 While the NEXO PS15s are bi-amp capable, most people run them passive, since there is not much improvement bi-amping them.My mistake. I have used them many times, and I have never even seen a passive set up. My experience with them has all been biamp. Mac Link to comment Share on other sites More sharing options...
Bad_Rock Posted June 5, 2006 Share Posted June 5, 2006 The PS 15's can be used bi amp or full range but you will tell the difference if you use their processor. Nexo's analog processor for the Ps 15's series can operate until 32db of voltage gain in your amp. Maybe you have a big amp but if the voltage gain it's over the 32db's then you are in trouble. I had the same problem using amps with low power and high gain. If this is the problem then try to get an amp with 26db0s of voltage gain ( that it's what they suggest) if not a 32db's voltage gain will work too. I hope this helps. Link to comment Share on other sites More sharing options...
rinkydinkron Posted June 7, 2006 Share Posted June 7, 2006 Can anyone advise where the best place to buy diaphragms for PS15's is and wether replacement is a straightforward job? Link to comment Share on other sites More sharing options...
Bad_Rock Posted June 7, 2006 Share Posted June 7, 2006 Can anyone advise where the best place to buy diaphragms for PS15's is and wether replacement is a straightforward job? They use a B&C component. If you buy it from B&C you will need only a smaller screw to place it on the horn. Link to comment Share on other sites More sharing options...
greenalien Posted June 7, 2006 Share Posted June 7, 2006 You are using a Nexo TD controller with feedback connections from your amp output, aren't you? Link to comment Share on other sites More sharing options...
sheldon Posted June 8, 2006 Author Share Posted June 8, 2006 You are using a Nexo TD controller with feedback connections from your amp output, aren't you?Yup. Funny thing is, this happens only to this cabinet. The exact same setup on other cabinets work ok. Anyway, I've already sent the whole cabinet to NEXO service centre here, and they're gonna take a look at it. Hopefully we'll have some answers soon.Thanks for all the help,Sheldon Link to comment Share on other sites More sharing options...
greenalien Posted June 9, 2006 Share Posted June 9, 2006 Sheldon - I hope you'll post the results of the technical examination here - PS15's are reputedly one of the most bulletproof speaker designs to date (provided they are used properly, with the TD controller feedback wired correctly and in phase, and properly thought out impedence matching with the amplifier), which is one of the main justifications for their high cost... Speaking to the guys from Fusion - Nexo's UK distributor - at PLASA a couple of years ago, they said that they had never had a unit returned with overload failure! The pops/sparks you report must be from residual charge from the capacitors in the crossover, doesn't really indicate a fault. It sounds as though you are using more than one speaker per amp channel, it would be interesting to know exactly how many, and what amplifier. Also, are these new units or have they been repaired / modified? (I've been using 2 x PS15's plus LS1200 for several years, with no problems to date - most frequent comment is 'how can so much sound come from such small boxes...) :unsure: Link to comment Share on other sites More sharing options...
sheldon Posted June 21, 2006 Author Share Posted June 21, 2006 Hi all, We got back our speakers today.The spark on the crossover was probably residual charge on the cap, most likely the fuse blew along with the driver. A recone and it's good as new. (pretty expensive, though)The other one with the popping LF had a capacitor on the crossover replaced. Apparently it went bad, and was causing the popping sound on high levels. We tested it in the warehouse and it seems fine so it seems the problem has been fixed, but we'll really know when we try it outside this weekend. Thanks for all the advise,SHELDON Link to comment Share on other sites More sharing options...
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