richie1575 Posted August 24, 2009 Share Posted August 24, 2009 Hi All! Can someone give me some advice? One of my EV RX212's horn tweeter is sounding slightly dull compared to the other one! I have swapped the dull sounding tweeter with a known good one and the fault remains with the original cabinet. Obviously I'm releieved at not having to fork out for a replacement DH7 Diaphragm but what else could it be.The crossover board has a power resistor, a ferrite coil, a capacitor and a lightbulb, and some kind of (electromagnetic/klixon?) device I don't recognise. I've checked for soundness of solder joints, all is fine and there is no visual sign of deterioration. What could be causing this?Like I said, the sound is only slightly dull. There is definately sound coming form the horn, just not as crisp as it ought to be! Thanks in anticipation! Richie Link to comment Share on other sites More sharing options...
J Pearce Posted August 24, 2009 Share Posted August 24, 2009 Check any grills or foam plugs for dirt and clogging? How slight is the dullness? Link to comment Share on other sites More sharing options...
DanHerbert Posted August 24, 2009 Share Posted August 24, 2009 Is the bulb in tact? As in not blown? Link to comment Share on other sites More sharing options...
rich1 Posted August 24, 2009 Share Posted August 24, 2009 in the EV SX300 they like using a polly switch (think thats what is called) little round disk shape. if you over drive the HF it burns out (open circuit) but they put a resister in parallel with it (maybe a bulb this time) so it just sounds dull have a look over the cross over and see if you can locate one. Link to comment Share on other sites More sharing options...
richie1575 Posted August 24, 2009 Author Share Posted August 24, 2009 Thanks for the replies! I checked for dust/debris and they are exceptionally clean (but thanks for the suggestion!)I have taken the liberty of ordering some spare lamps! They are arriving tomorrow! Not cheap!! Will let you know how I get on! Richie Link to comment Share on other sites More sharing options...
richie1575 Posted August 26, 2009 Author Share Posted August 26, 2009 Hello again! Changed the lamp... still got the problem! ;) I'm considering changing the caps next... unless anyone had any other ideas??? Richie Link to comment Share on other sites More sharing options...
dknoise Posted August 26, 2009 Share Posted August 26, 2009 Thanks for the replies! I checked for dust/debris and they are exceptionally clean (but thanks for the suggestion!)I have taken the liberty of ordering some spare lamps! They are arriving tomorrow! Not cheap!! Will let you know how I get on! Richie Apologies if I've missed this somewhere, but why not swop the crossover unit from the "known good" into the "dull" to confirm or deny. Regards Dom Link to comment Share on other sites More sharing options...
berry120 Posted August 26, 2009 Share Posted August 26, 2009 Changed the lamp... still got the problem! ;)If there's sound coming out of the tweeter then that wouldn't be the issue - the lamps essentially act as fuses, the idea being if you push the tweeter too hard the filament in the lamp should fry before the tweeter. Spares are always useful though so not entirely wasted on that front ;) +1 on the crossover advice above - can you not just swap them over? I've no experience with that particular cab though so apologies if that's something that can't really be done! Link to comment Share on other sites More sharing options...
rich1 Posted August 26, 2009 Share Posted August 26, 2009 did you look for that poly switch thing ? looks like thishttp://www.vcn.com.cn/upload/product/jksb/sxj/gsznq/13211/polyswitch_2007102616382888508.jpg Link to comment Share on other sites More sharing options...
wmcalin Posted August 26, 2009 Share Posted August 26, 2009 This will not be a poly switch issue, I've come across this before on a number of occations, you need to get the components checked on the xover board, get someone to run a signal generator into both xovers and have a look at the results using a scope. The components ie resistors and caps you can normally get from RS components or CPC, however inductors can be a job to find.I did find a place in Lincoln but I cannot remember details they they will custom wind these for you but will need the value's ....EV will provide diagram of xover which will include all of the info required. Hope you get the issue sorted Link to comment Share on other sites More sharing options...
richie1575 Posted August 27, 2009 Author Share Posted August 27, 2009 Hi! Thanks again for the input! Thanks for the polyswitch pic! The component I have looks more like a relay. Its black, about 30mm high, 30mm long and 10mm thick! I know that some types of capacitor can deteriorate, they "look ok" , but might it be worth changing them as they'll be relatively inexpensive??? I have swapped the tweeters over, but not the actual crossover boards... this could eliminate contamination in the bi-amp switch, so I may try it! Thanks for the advice once again! Will keep you posted! Richie Link to comment Share on other sites More sharing options...
aidso Posted August 27, 2009 Share Posted August 27, 2009 ring sean at shuttle sound he sound be able to help. but if you have swopped tweeters over I would say more than likely its a bad crossover. He sould be able to sort you out with a new one. Link to comment Share on other sites More sharing options...
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