leon garrity wrote on Sun, 06 February 2011 21:15 |
Well my luck gets better,
this weekend ive managed to blow 3 horns in total,all burnt to a crisp???????
can anyone shed any light,im using a Lab fp 3400 on the SM60f now i know it says the Danleys can take 800 cont/1600 program.I try never to get the amp to clip but it delivers 1500 at 4ohms,but it delivers 94 volts max output can this be too much for the Danley box .When i ran the EAW,i had to implement the max voltage into the eaw processor and it would automatically set the limiters to protect the drivers. Since using the Sm60f's i have gone through 8 horns,if i set the amp to give me only 1000 watts the box doesn't get as loud. The SM60f can give out upto 127db max now what does it need to generate that,if i were to give it only 800 watts i definatley wouldnt get a workable volume.
Could this be any of the following???????
voltage spikes too much voltage from amp to drivers too much wattage to box from amp,but if i put smaller amp on it does not go as loud. Why only the horns?????????? not the whole box if it was too much power then surely the mid driver would go bang with 1500 watts on it. can different amps work better with different boxes?
any advice would be good.
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Some more thoughts.
Apparently you have gone through quite a number of HF diaphragms.
Are you SURE-absolutly sure) that you do not have any HF oscillations in your system. Now you will NOT hear them-often they are ultrasonic 9above hearing range).
I know of several cases that VHF oscillations cause constant HF driver damage. One case was at 60Khz, another at 45Khz, another at 30Khz and another at 25KHz.
This is not very common, but DOES happen. I know of only those 4 cases in all my years in this business.
The only way to check is to put an O'scope on the amp outputs, with everything hooked up as normal-but with no input. But of course one of the inputs could be causing the problem.
Have you been cleaning out the cap real good after a failure? If not this could contribute to an early death of the next one.
Also have you examined the crossover? Does anything look like it has gotten hot? resistors with discolored letters/cracks/light brown spots in the middle-capacitors with cracked cases-coils with melted bobbins or dark windings and so forth.
It is possible that the crossover got damaged some time ago and is not having the correct freq to to the HF drivers and putting strain on it.
Anytime there is damage to one part of a circuit in any device (loudspeaker-amplifier etc) you have to look at other areas that are associated with it to make sure they are operating normally.