JR149 - foam

[Wakefield Turntables]

does the foam above the tweeter on a JR149 actually do anything?



If not I just want to strip it off.

[Gordon Steadman]

I was told it helped damp the metal cover although I couldn't hear any vibration when the foam fell off mine.

[walpurgis]

It's likely there to address a diffraction issue at the top 'lid' lip. You could replace it with something less ugly though.

[Gordon Steadman]

It's likely there to address a diffraction issue at the top 'lid' lip' You could replace it with something less ugly though.

Sounds more likely!!

[Wakefield Turntables]

I thought it could be a diffraction thing, just not sure thats all. Well I've whipped it off now so I will have a listen and see if it makes a difference.

[walpurgis]

Any diffraction effects may be difficult to pin down just by listening. They will almost certainly vary audibly according to the listener's position in relation to the vertical dispersion pattern of the tweeter.

[Mr Kipling]

How are the grills held in place?

[The Barbarian]

How are the grills held in place?

The mesh grill on the front is stapled on. the main foam grill wraps all around & held in place at the back by round velcro pads..

[Wakefield Turntables]

Andy I have no idea what the foam does but my LS 3/5a, using the same T27 tweeter, has foam surrounding it

I've enclosed a pic of the T27

Thanks, but I think on your LS 3/5a's it works as a method of damping the speaker, if you look at my post you'll see a black material around the tweeter, this is how they did it on the JR149. I could of course be completely wrong but I think that's what it does.

I restored a pair of JR149s for a record dealer about 15 years ago, without the foam the imaging suffers very slightly so it is a diffraction thing. The original glue was as you say crappy, so I used double sided tape.

Paul, thanks. Looks like I'll into getting some more foam as some point.

Andre. I'm still thinking about if I actually want foam on the spekers, I'm more worried about restoring the veneer. This is virgin ground for me.

[PaulStewart]

I restored a pair of JR149s for a record dealer about 15 years ago, without the foam the imaging suffers very slightly so it is a diffraction thing. The original glue was as you say crappy, so I used double sided tape.