JBL L100 help needed

[setayj]

I just acquired a pair of JBL L100 speakers with no grilles. I want to build a pair of grille frames and then order foam grille replacements that are available on Ebay. What I need is help on the dimensions of the frame itself. I intend to use a sheet of MDF and frame it with strips of walnut. Can anyone tell me dimensions on the original grilles of the following:

1. Width and thickness of the walnut frame edges
2. Thickness of the particle board face

I know the foam fits into a recessed area that would be the the difference of #1 and #2 above, but if you could also tell me what that recess is it would be nice to know.

Thanks in advance for all help!

 

[JBLKRAZEE]

Hello & welcome!

The orig. L-100's did not have a grill frame of any kind. They were simply equipped with the foam "eggcrate" cover, which was secured with velcro.

If you wish to build a more rigid frame, it will have to be a measure & fit process, in which the new foam would have to be cut to accept the dimensions of the frame you create.

Hope it helps! :thmbsp:

 

[setayj]

Here is a picture of what I am talking about

This is a picture of an L100 frame without the waffle foam

Here is picture of the frame with foam in place

 

[bigstereo]

Hello & welcome!

The orig. L-100's did not have a grill frame of any kind. They were simply equipped with the foam "eggcrate" cover, which was secured with velcro.

I believe that all L100 had frames. Here's a pic from the 1971 catalog (borrowed from LH forum). Note the seam where the frame mates up to the cabinet. You may be thinking of the 4310/4311 that had the grill velcro'd to the cab, but they had cloth covers over a frame also. I've owned both orig Century's (drivers aligned vertically) and 4311's

 

[GordonW]

I believe that all L100 had frames.

This is correct. Even the 'straight line driver array' early models had the same frame, just with a slightly different cutout for the drivers.

Regards,
Gordon.

 

[thisOne]

"setayj" has the answer to your qestion. There is a wallnut edge on the grille frame and the foam sets in it

I have a set just like that but with the orange foam insert (it looks now just like the one in the ad photo )

 

[bigstereo]

He needs dimensions

"setayj" has the answer to your qestion. There is a wallnut edge on the grille frame and the foam sets in it

I have a set just like that but with the orange foam insert (it looks now just like the one in the ad photo )

You have frames. Got a tape measure?

 

[GordonW]

Well, come to think about it, it's pretty easy to describe. Going from memory:

The woodwork on the outer edges was 3/16" thick solid wood (walnut), 3/4" wide strips around the perimeter. The grilles were EXACTLY the same dimensions as the cabinets, at the outsides of the wood perimeter... that should set the dimensions for the particle board inner part (subtract 3/16" twice from each outer cabinet dimension, height and width, and you have the inner part size).

The particle board frame was made from 1/2" thick material... so, the wood perimeter extended forward 1/4" from the front of the flat particle board inner panel, making a recess where the grille foam fit into.

The cutout for the drivers is the only difficult part... however, exact accuracy is not that important, other than making sure the hole is positioned correctly and of sufficient size for the drivers to fit into. You could probably "eyeball" that from the picture above, of the grille frame without the foam...

Regards,
Gordon.

 

[setayj]

Thank you Gordon!

Those are precisely the answers I was looking for.

By the way, I have remembered the L100 sound fondly for many years. The L50 speakers on my bookshelf sound pretty good until you turn on the L100's. It's like night and day.

 

[thisOne]

You have frames. Got a tape measure?

Both are at home, so when I get there I'll measure...

Besides this thread just confused the heck out of me (easily done at the end of the day)

• The OP asks a question
  
• The OP answers with photos of the speaker and the frames
  
• I answer telling the OP that the OP has the answer
  
• then I need a tape measure
  
• I could use a drink...:scratch2:

 

[Tuquala]

I am in the same boat, needing to make frames for a pair of L100s I picked up recently. This is an answer I recieved from a grille foam supplier;

"L100 frame opening is 23 3/16” X 13 15/16”.

That is the only measurement they provided, but no problem, since I can measure the outer dimensions of the speaker front.

Hope that will help.

 

[Fred Sanford]

Some of the suppliers of grille foam also will sell frames at a decent price, if someone's looking for ready-made solutions. Searching LHF should find them easily, I believe it's:

http://www.foamtrends.com/

je

 

[lrb1951]

Here are a couple of pics of my L110s with Roger & Bart's (Foam Trends the outfit je mentioned) frames and foam inserts. Not the best pics, just what I had on hand.