SBL rebuild

My naxo is at Naim for repair/service so perfect opportunity to rebuild the sbls that i bought with it about 6 months ago...

I used a sharpened carving knife to slice through the sealant. It was a good seal yet, It all came off in one piece very easily.


LF driver box
You can see the 4 spike plates stapled on the underside.
(How the hell do you get those Staples out?)

The black grill - a diffuser?

Inside the boom box

Top plate

There is another gasket on the underside of the top plate, sealed to the boom box. It feels a bit squidgy, the top gasket feels firm which I'd expect (like the new gaskets I have). Has anyone ever replaced the lower gaskets? Are they even available? They look thicker than the upper gaskets.

What is this filler? - wool?

I will update upon completion.

Ali B

Original Post
arb76 posted:

I don't know why, i can see them fine.

arb76,

Most likely, you see them fine because you have internal links, assuming you're viewing on the same device you posted from. Try looking at your pics from a different device and see what you get. I don't see the pics from my PC notebook running  Windows 8.1, IE 11. Are you posting your links from a third-party host and using the URL?

While we're on the subject, there's a dbl Restoration post and all but the last photo isn't visible. However, unlike mine with the no entry sign, that says something about reaching the storage limit. Do others see the same? Anyone know how I can see those photos?

The problem could be that your photos in Google photos are to large and thus blocked by the forum software. Historically I've downloaded photos from Google, reduced them to 25% of original size, uploaded them to photobucket and linked from there. However having revisited my DBL thread it looks like photobucket have "moved the goalposts" and this is no longer working. Will have a look, post-coffee, and see if I can fix that.

Willy.

Ps can see the photos on your direct Google link. Not sure if this breaks the rules of no links in hi-fi corner?

arb76 posted:

I removed the spike plates, quite easy in the end; lift one side of the plate with a flat screwdriver and then prise off gently from under the plate.

From the photos you can see the spikes have pierced the plates and into the under section.

I think I have some spacers the exact size I can use for refitting and hopefully avoid this.

https://goo.gl/photos/oUDLQmLijYGnQ97k8

The spike/plate interface is a key part of the way the SBL works. What you need to do is fill the holes under the plates with Ronseal High Performance wood filler. When it's dry sand flat and then install new plates. You can get the new plates from Naim as part of a gasket kit.  When reassembling the spikes should set on the plates but not penetrate. 

My DBLs are up and running, currently playing The Heart of Saturday Night by Tom Waits. Improving by the day as the reconed Bass units bed in. I'll try find time later to put the DBL photos into an album and post a link. 

Willy.

Thanks Willy

Great info.

I have said plates and gaskets ready to go. Just need to follow your advice now.

Still wondering about the lower gaskets though. I would assume they're original.

No rush as the naxo will be at naim for a few weeks but, missing music already, only been a week.

Enjoy.

arb76 posted:

I removed the spike plates, quite easy in the end; lift one side of the plate with a flat screwdriver and then prise off gently from under the plate.

From the photos you can see the spikes have pierced the plates and into the under section.

I think I have some spacers the exact size I can use for refitting and hopefully avoid this.

https://goo.gl/photos/oUDLQmLijYGnQ97k8

The spike/plate interface is a key part of the way the SBL works. What you need to do is fill the holes under the plates with Ronseal High Performance wood filler. When it's dry sand flat and then install new plates. You can get the new plates from Naim as part of a gasket kit.  When reassembling the spikes should set on the plates but not penetrate. 

My DBLs are up and running, currently playing The Heart of Saturday Night by Tom Waits. Improving by the day as the reconed Bass units bed in. I'll try find time later to put the DBL photos into an album and post a link. 

Willy.

 

Hey

It's been a while but, finally getting around to the sbls.

I downloaded a copy of the dbl/sbl manual and I'm just reading through it now. However, it says the spikes on the top of the boom box SHOULD piece the aluminium plates on the underside of the bass driver box, contrary to the advise above.

I wouldn't doubt the manual we're it not that Willy has done it and knows what he's doing.

Willy?

Anyone?

Thanks.

Thanks Richard.

I meant pierce in case others misunderstood.

Yes, all else is done I'm about to silicon the 2 together.

I'm sure I read somewhere that a small amount of washing up liquid where the silicon will make contact on the gasket and the underside of the bass box. True?

The thin smear of washing up liquid is an in-house trick that made it much easier to peel everything off when you have to keep re-doing the seals - as you did when moving demo speakers around all over the place. It's not strictly necessary, and maybe even something I would caution against as if it's down wrong then you may not have a good seal, but it does make things easier when you next take the speakers apart.

Thanks stu

I have said gaskets and like you say they're good quality. Plates too.

These speakers are a bit of a toy for me, along with the other CB boxes. 

I'm thinking about different filings etc.

The current system sounds good, this setup allows for good scope.

 

The wording in the DBL manual is "push down gently on middle cabinet to form spike indents in the aluminium pads fitted to its bottom surface" 

No suggestion in the (DBL) manual that the spikes should pierce the aluminium pads, which is in line with everything I've read elsewhere. 

Regards,

Willy.

The manual I have is for dbl, sbl, into and credo. (each with its own chapter)

Hi Willy.

In the paragraph before the paragraph where it says 'gently push down...' it says, and I quote - 'it is fitted with aluminium pads on its lower surface which the spikes on the stand top-plate should pierce when the loudspeaker is properly assembled'.

I might think it were a typo but it says it again a few paragraphs further down in more detail.

I suppose I could start not pierced and go from there if I'm not happy with the sound.

Thanks

When I had SBLs I preferred just the slightest indent but definitely not piercing. The reason for this is that they'll pierce really easily with just marginal excess force and then you'll end up with a non-parallel gap (which is how they were set up by the dealer and why I chose to redo them properly). I'd start out with them just resting on the pads if I were you.

I assume you've done the Ronseal filler job first...

Thanks all for the advice.

It's all back together and sounding great... And that's with the naps needing a service.

I went with just gently placing the LF box on the spikes and any indents into the plates would be under its own weight. I'm pleased with the sound at the moment but, that gives me the option of altering without having to get new plates.

Gonna get a couple of weeks listening in before sending the naps off...

Thanks

Likes (1)
nonaimnomusic
×
×
×
×