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PostPosted: Wed Apr 23, 2008 12:33 am 
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Mark II

Joined: Fri Feb 08, 2008 11:00 am
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Location: Beaver, PA
Ok, so I have a widebody mark iv, and recently purchased the reissued EVM-12l classic and would like to swap out the C-90 for the EVM.
How do i do so?

Some guys on the forum say it cant be done, and others talk about how they have it in their widebody and love it. I heard u have to get rid of the reverb unit and there is an issue with Front vs. rear mounting, but im not sure if their saying it wont fit b/c it is an old one with the heatsink or what. If anyone can help please let me know.

Thanks

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PostPosted: Wed Apr 23, 2008 1:57 pm 
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If it has a heatsink, it can be removed. I think you could front mount a new one.

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PostPosted: Wed Apr 23, 2008 5:45 pm 
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Just looked at a widebody with a C-90. It's a rear mount speaker. You should be able to front mount an EV, but I do not know what clearance there will be between the speaker and the grill. You will, of course have to put new screw holes in the front of the baffle, but it may be worth a try.


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PostPosted: Wed Apr 23, 2008 9:24 pm 
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Mark II

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thanks, when i start the actual surgery, i will keep the forum posted

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PostPosted: Thu Apr 24, 2008 6:05 am 
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atlst7 wrote:
thanks, when i start the actual surgery, i will keep the forum posted


Cool, I'm always interested to hear how these things turn out.

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PostPosted: Thu Apr 24, 2008 8:28 am 
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Mark IV

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I had a MKIV that I did this conversion and I did have to remove the reverb tank. Also, I had to move the cooling fan. It was a tight fit, but it sounded awesome. I would recommend that you remove the bottom baffle, reverb tank, cooling fan, and the guts of the MKIV and then do the swap.

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PostPosted: Mon May 12, 2008 10:46 pm 
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Mark II

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Good news EV fans...

The EVM-12L Classic is succesfully in my '06 MK-IV Widebody Combo and sound amazing. Some pointers:

You must remove reverb, fan, grill, guts, ext. untill you are down to just the cabinet. Remove the orignal Mesa/Celestion speaker, while keeping the gasket intact. Then You must drill a couple extra holes to mount the new EV Classic in. Line it up correctly first. Mine is Rear-mounted, just like the MC-90 was.

Also You are able to keep the reverb unit, fan, grill and everything else in its normal position as well (I hears some people saying the reverb must be perminantly removed and the fan perminatly moved).

Make sure u get the 8 ohm verision of the speaker.

I will get some pics of the mark iv with her new mod. - Thanks :!:

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PostPosted: Mon May 12, 2008 11:01 pm 
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No Mods required? Excellent.

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PostPosted: Tue May 13, 2008 6:42 am 
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Mark II

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I'm interested in seeing how this is done too.

I'd have thought the valves might be too close to the speaker with rear-mounting ? Any particular reason you didn't go with front-mounting ?

lyn


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PostPosted: Tue May 13, 2008 9:52 am 
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lento wrote:
I'm interested in seeing how this is done too.

I'd have thought the valves might be too close to the speaker with rear-mounting ? Any particular reason you didn't go with front-mounting ?

lyn


If my old Mk IV was like his, you'd have to remove a good section of wood from the the grill "frame".

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PostPosted: Fri May 23, 2008 1:14 pm 
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Mark II

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atlst7 wrote:
Good news EV fans...
I will get some pics of the mark iv with her new mod. - Thanks :!:



Any chance of seeing those pics ? I've been wondering whether to do this
myself.

At present I have an EV in a Thiele, but would like to see how tight the fit is in the combo

lyn


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PostPosted: Sun Jul 20, 2008 11:47 am 
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Mark II

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im having trouble uploading the pics... They are on my computer not on the internet, so how do I do this???? I really want to get them up but dont know how to insert a pic. When i hit [img]all%20that%20heppens%20is%20it%20inserts%20a%20little%20[img][/img]

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PostPosted: Mon Jul 21, 2008 10:55 am 
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Mark II

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Image


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PostPosted: Mon Jul 21, 2008 11:48 am 
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Mark II

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Did you attatch the EV with just the 4 screws from the C90, as I think I see 2 holes unused ?
It looks to be a good, probably tight fit though!

Worthwhile difference in sound ? Reason I ask is, I only know how the EV sounds in a thiele.

Thanks for posting

Lyn


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PostPosted: Mon Jul 21, 2008 1:09 pm 
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Mark II

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yes, I used the 4 original screws from the C-90. As for sound there is a definite change. The evm has a tighter bass chug, more defined RYH 2, soaring leads, and allows for more much needed headroom. I have no experience with a theile but everyone talks them up, probably because there closed back and push a lot of sound. The EVM probably doesn't make as big of a sound difference in the Half back than it does in the closed back theile. Basically overall I think the EVM makes more sense for the MK-IV than the C-90 because I consider it a high gain amp(even though it has awesome vintage capabilities) and the EVM is the perfect high gain speaker.

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