Hi,i'm using a pre-poweramp set up for a while and everything worked fine until yesterday.I always used my Crown Drivecore XLS2500 in stereo mode,both sides of the head works perfect.Yesterday i had to use it in bridge mode for the first time so i took a Neutrik Speakon NL4 FX and rewired it for that purpose...1+,2+ on amp side and 1+,1- on cab side,and put the amp on bridge mode,plug my speaker cable in ch 1 and preamp in ch 1 1/4.As soon as i powered up the amp it made lots of noise and all the lights were on...clip,thermal,signal,all of em.I then reversed the process and everything resumed and worked like a charm then did the same thing all over again and same result.What am i doing wrong,could it be my cab SWR Goliath 3(8ohms).Could it be because the NL4FX shouldn't be use for bridge purpose.............Any help would be appreciated
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Poweramp help!!!!!(Crown drivecore)
- Thread starter Eden66
- Start date
You seem to have it wired properly (1+ to 1+, 2+ to 1-) and you're using the correct channel. You said you're using an NL4 - are there only the two conductors, or is it 4? Could something within the SWR cab be connecting to the 2+ or - pin?
Is it possible your SWR cab is 4 ohms? That could do it too.
Is it possible your SWR cab is 4 ohms? That could do it too.
Thanks,the cab is labeled 8 ohms but anyways the Crown is supposed to be capable to bridge 4 0hms.The cable is a 4 conductors.Everything seems to be wired properly in the cab but i know nothing in that department,stupid when it comes to electric
.The easyest way to know would be to try it with another cab but i don't have a second cab right now,i was only planning to use 2 for a big venue in 3 weeks.
.The easyest way to know would be to try it with another cab but i don't have a second cab right now,i was only planning to use 2 for a big venue in 3 weeks.
I used to have a Carvin BX1200 that wouldn't work with an Acme Low B4 if I used a 4-conductor speakon cable. Turns out the Acme connected 1+ to 2+ internally. Even though the schematic Carvin sent me showed no connection to either the 2+ or 2- on the speakon out, this would cause the BX1200 to shut down. Using a 2-conductor cable worked like a champ.
Long way of saying, try clipping the extra 2 conductors so they cannot touch any of the NL4 connections.
Long way of saying, try clipping the extra 2 conductors so they cannot touch any of the NL4 connections.
Ok,it looks a lot like what's happening to me right now but i have no idea how to deal with that.Do you mean wiring the cable in its original way and run the amp in bridge ???
Yeah that's true,they're very hard to see but i checked about 10 times to make sure.
I just tought of something,i bought that cab used and the tweeter never worked but i'm not a fan of tweeters so i didn't pay attention but 2 weeks ago i saw that the fuse was blown so i put a new one and still didn't work so i think my attenuator is fried it's also very hard to turn the knob.Do you think it could be the reason of the bridge issue?Otherwise the cab plays like a charm.
I didn't mean to wire the cable its original way. Just make sure only two conductors are being used, rather than 4.
The L-pad could be fried, but if the cab works properly (sans horn) in unbridged mode, then that's probably not the cause of your current grief.
The L-pad could be fried, but if the cab works properly (sans horn) in unbridged mode, then that's probably not the cause of your current grief.
hmm that is strange I run my XLS1500 bridged all the time and have had zero problems. just some basics to remember, most of which you have already done: check to make sure the wiring is correct on the cable and that you have the correct end at the amp and speaker sides. make sure you have it in bridge mono mode and that you are running it off the correct output.
