Sierra-2 Upgrade instructions with video!

[Mag_Neato]

Oh boy, just read through this thread. I have the original Sierra cabinets and my upgrade kits are shipping soon. Will things fit without sanding/modification???

If they are for sure from the first batch of cabinets and you have not done the NrT upgrade then you will definitely have to use self threading wood screws to mount the new crossover as the hole pattern is different. I would also anticipate the woofer flange issue. You can remove the original woofer and measure the I.D. Of the cutout to be sure. If it is 156mm or less you will have an issue.

[merrymaid520]

If they are for sure from the first batch of cabinets and you have not done the NrT upgrade then you will definitely have to use self threading wood screws to mount the new crossover as the hole pattern is different. I would also anticipate the woofer flange issue. You can remove the original woofer and measure the I.D. Of the cutout to be sure. If it is 156mm or less you will have an issue.

I'm not worried about the XO but the woofer issue might pose a problem

[davef]

I'm not worried about the XO but the woofer issue might pose a problem

Worst case, you might have to shave the woofer opening just a bit. You have woodworking skills -- this will be a cinch for you compared to what you have done in the past

[merrymaid520]

Worst case, you might have to shave the woofer opening just a bit. You have woodworking skills -- this will be a cinch for you compared to what you have done in the past

Gotcha, last time around I had assistance (father in law). I'm guessing its nothing a little Dremel can't handle!

[Mag_Neato]

Gotcha, last time around I had assistance (father in law). I'm guessing its nothing a little Dremel can't handle!

I should have used a Dremel, but one was not handy and my impatience won out. I tried a piece of sandpaper at first but was not making much progress, so I put a flapping wheel in my drill and went to town. That made the opening tapered from the top to bottom so the woofer fit at first, but the opening closed up quickly towards the bottom and I could not get it opened up. I ended up with some scratches and scuffs on the front of the cabinet. I ended up using a utility knife (box cutter) and carving the inside diameter of the opening until the woofer dropped in. Once I'd started the upgrade process I was determined to complete it without stopping! I think the results make up for the slight cosmetic damage I did.

[eliwankenobi]

Gotcha, last time around I had assistance (father in law). I'm guessing its nothing a little Dremel can't handle!

You can do it!!

[merrymaid520]

You can do it!!

Thanks Guys, I have no doubt it will go just fine

[Blue Dude]

I have a set of three (LCR) early Sierra-1's, with the original drivers and crossovers. Is there a way to tell from the serial numbers if they can be upgraded without modifying the cabinets?

[Mag_Neato]

I have a set of three (LCR) early Sierra-1's, with the original drivers and crossovers. Is there a way to tell from the serial numbers if they can be upgraded without modifying the cabinets?

Remove the woofer and measure the opening in the cabinet. The new woofer's mounting flange has an O.D. of 156mm. If the opening is exactly that or less, you will have to open it up. The other mod is much simpler involving the crossover. If the mounting holes are different you will need some self tapping wood screws.

[Blue Dude]

Remove the woofer and measure the opening in the cabinet. The new woofer's mounting flange has an O.D. of 156mm. If the opening is exactly that or less, you will have to open it up. The other mod is much simpler involving the crossover. If the mounting holes are different you will need some self tapping wood screws.

Well, the OD of the flange is almost exactly 156mm, maybe a hair smaller. The ID of the hole in the cabinet is 130mm. This is an early set with serial numbers around 230. It sounds like it may need some widening and while I'm reasonably handy I'm not convinced I'm up for that.