Ollie80 Posted March 17, 2009 Share Posted March 17, 2009 Hi - Just seen a system set up and slightly concerned. 100v line amp going to 10 x JBL Control 1s. The JBL control 1s are not 100v line speakers. They are all daisy chained together. Dont think there is any step down transformer in place. Could this cause issues?? Been told by the tech at the venue he has no problems with it but we are due to run a live event next month and knowing my luck the speakers might give way :blink: or amp will over heat. The system will be running speech only. It looks like it has been installed a long time and no problems have been reported. We are testing next week but will let the venue tech turn the amps on! Your thoughts on this one please... TA! Ollie Link to comment Share on other sites More sharing options...
Chris Beesley Posted March 17, 2009 Share Posted March 17, 2009 JBL control 1s were available in 100V versions - are you sure they are standard Control 1's? Link to comment Share on other sites More sharing options...
paulears Posted March 17, 2009 Share Posted March 17, 2009 10 8 ohm non-line versions would no doubt be very unpleasnt to the amp - it would see a virtual short circuit, so if the work, the odds are pretty much on them being transformer fitted. Link to comment Share on other sites More sharing options...
Ollie80 Posted March 17, 2009 Author Share Posted March 17, 2009 Thanks chaps - you might be onto something. Even though I looked at the back I did not see the usual selector that taps into the transformer. Well I guess we might be ok then. Link to comment Share on other sites More sharing options...
Seano Posted March 17, 2009 Share Posted March 17, 2009 10 8 ohm non-line versions would no doubt be very unpleasnt to the amp - it would see a virtual short circuit, so if the work, the odds are pretty much on them being transformer fitted. Unless there are a whole bunch of them wired in series. Extremely unlikely I'm sure, but might this be possible? Link to comment Share on other sites More sharing options...
bruce Posted March 17, 2009 Share Posted March 17, 2009 If memory serves me correctly, it's the Control 1 AT that has a 100V transformer built-in. At first glance it looks the same as a standard control 1 - the transformer tappings can be changed by using a screwdriver to turn a control on the back... Link to comment Share on other sites More sharing options...
Ollie80 Posted March 18, 2009 Author Share Posted March 18, 2009 Hi Bruce - yes, I checked out the Control 1 AT on the internet yesterday. When we go back next week I will have a look at the model number and look out for the transformer screw tappings if I can.. Cheers, Ollie Link to comment Share on other sites More sharing options...
bruce Posted March 18, 2009 Share Posted March 18, 2009 There are various suffixes for the control-1 range. I think it's "T" for transformer, "W" for white and "C" for cheapo version.. Link to comment Share on other sites More sharing options...
aidso Posted March 18, 2009 Share Posted March 18, 2009 If they were not 100v the amp would have more than likely cooked itself by now. Looking at the Control-1 AT there is very little difference between it and a standard one. Link to comment Share on other sites More sharing options...
Solstace Posted March 18, 2009 Share Posted March 18, 2009 And for that kind of application (speech/background systems) I've seen plenty of standard 8 or 4-ohm speakers (usually Bose 101's or JBL Control 1's of various types) retro-fitted with 100v line transformers. Usually these are placed inside the cabinet - but not always. My suggestion: If you think you're not happy, you can (usually) bring your own gear just in case!!! Link to comment Share on other sites More sharing options...
Ollie80 Posted March 18, 2009 Author Share Posted March 18, 2009 Good idea Solstace, we will give the system a test next week and yes if we are not happy with it we will fit up our own PA. Ollie Link to comment Share on other sites More sharing options...
Recommended Posts
Archived
This topic is now archived and is closed to further replies.