very strange

[hammy]

Ok, I set my rig up last night and all switched on the sound check went well an sounded good.

20 mins later when the disco was due to start I switched on again and my jbl`s sounded like pooh, The only way I can describe it is really really dull sounding, After 10 - 15 mins of changing cables and power leads it still sounded pooh, I switched on my mic turned up the volume a bit too much which caused a bit of feedback, As soon as the feedback came on the jbl`s sounded crisp and perfect again apart from one side which seemed to catch up after an hour.

Is this something thats wearing out ??

jbl eon 315`s

[Excalibur]

It's sounding like a loss of the HF units, but why they went off in the first place,and why they came back after you got the microphone feedback is the big question?

You haven't got an active crossover in the chain have you? Or subs with a built in crossover? Somewhere in there would be my bet.

[hammy]

Easy answer to that is no, They are coming straight from the mixer.

[Excalibur]

Easy answer to that is no, They are coming straight from the mixer.

Guessed as much.
Right, now we're into fantasy land. Only thing I can suggest is to see iof you can get to the internal crossover in the cabs easily, and look for any loose connections, or poor looking solder joints. Modern solder is notoriously unreliable, since they modified the stuff on Elf and Safety grounds!

I believe the JBL's are quite "pronounced" in the top end, so losing that would indeed make them sound muddy and woolly. Best I can do, sorry.

[hammy]

Hey Peter that sounds a perfect explanation "muddy and wooly", The store I bought them from is open today so I might just take them in for them to look at under the warranty

[DiscoPromotions]

As you going direct from the mixer. Did you check the mixer? Food for thought

[hammy]

As you going direct from the mixer. Did you check the mixer? Food for thought

No I didnt

[Excalibur]

As you going direct from the mixer. Did you check the mixer? Food for thought

True, but: There shouldn't be any filters in the mixer to cut the HF.

Aha!!!!! Possibly well done that man. Tone controls on the mixer. I have a KAM 1500 which has a couple of channels where the tone controls are shot. Just looking at them causes the sound to go from booming bass to screeching tops. Another possible cause.

[hammy]

I should have added I also checked them in different channels

[Booche]

I had a similar situation last night with my Class D's with them sounding a bit crackled then after 10minutes they were fine