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[John Oliphant]

The auditorium where I'm the lead volunteer had one of its speakers fail. The HF horn on one for them has gone silent.

This sounds easy, and technically it should be, but I want to ask here before I commit to this repair. The speaker is one of three hung about 15 feet above a stage, and we have a good lift that will put me right up there. The three speakers are connected in parallel to the big side of a Crown MA-36x12 amp.

I'm guessing the HF diaphragm failed, and that I'm going to have to remove the back panel and pull out the driver to replace the diaphragm. Will this be as easy as it sounds, as easy as I hope? Any tricks or secret codes? lol

-John O

[Robert Healey]

The auditorium where I'm the lead volunteer had one of its speakers fail. The HF horn on one for them has gone silent.

This sounds easy, and technically it should be, but I want to ask here before I commit to this repair. The speaker is one of three hung about 15 feet above a stage, and we have a good lift that will put me right up there. The three speakers are connected in parallel to the big side of a Crown MA-36x12 amp.

I'm guessing the HF diaphragm failed, and that I'm going to have to remove the back panel and pull out the driver to replace the diaphragm. Will this be as easy as it sounds, as easy as I hope? Any tricks or secret codes? lol

-John O

Here's a service manual: [PDF Warning] http://archives.telex.com/archives/EV/Speakers/Service%20Manuals/Sx500%20Service.pdf

[John Oliphant]

Here's a service manual: [PDF Warning] http://archives.telex.com/archives/EV/Speakers/Service%20Manuals/Sx500%20Service.pdf

Thanks, that's some extra detail than the doc the EV rep sent me. Good to have both.

[Jim McKeveny]

Great that you have a lift.

Now the bad news: These are not the most rugged diaphragms/drivers in their class. In my experience, they behave much like the OEM headlights on a car - When one goes out the others soon follow.

[John Oliphant]

Great that you have a lift.

Now the bad news: These are not the most rugged diaphragms/drivers in their class. In my experience, they behave much like the OEM headlights on a car - When one goes out the others soon follow.

Ahh, good to know. These have been installed for about ten years, so we will definitely keep that in mind.

[Stu McDoniel]

The auditorium where I'm the lead volunteer had one of its speakers fail. The HF horn on one for them has gone silent.

This sounds easy, and technically it should be, but I want to ask here before I commit to this repair. The speaker is one of three hung about 15 feet above a stage, and we have a good lift that will put me right up there. The three speakers are connected in parallel to the big side of a Crown MA-36x12 amp.

I'm guessing the HF diaphragm failed, and that I'm going to have to remove the back panel and pull out the driver to replace the diaphragm. Will this be as easy as it sounds, as easy as I hope? Any tricks or secret codes? lol

-John O

Disconnect the leads off the driver and put a Volt Ohm Meter set to ohms on it
If dont read anything the drivers voice coil is open and yes replace..
If that is an 8 ohm driver you should read between 5ohms and 6ohms DC resistance.
Diaphragms are easy to replace.  Just make sure you clean the voice coil gap real good.
Im betting youtube has some how to replace diaphragms videos.
The EV diaphragms are real easy to replace and self aligning

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