A bit of speaker updating

In case you need a tidy technique for enlarging a cut-out in timber, this seemed to work rather well:
http://wiki.diyfaq.org.uk/index.php/RTL3_Speaker_repair
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Cheers,

John.
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On Fri, 16 Jun 2017 22:56:19 +0100, John Rumm

Well done, although that last paragraph was a cross between Jilly (hic) Goolden and John (Never Mind the Quality, Feel the Width) Bluthal!
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Graham.
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On 16/06/2017 23:13, Graham. wrote:

;-)
Yup the classic trap of trying to describe how something sounds!
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Graham. wrote:

I thought he was auditioning for a guest column in What HiFi :-P
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On 17/06/17 11:08, Andy Burns wrote:

"still the deep easy open base response"
Well at least you didn't confuse low frequencies with a fish, or a bottled beer...but a slang name for a street drug...
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On 17/06/2017 11:15, The Natural Philosopher wrote:

Although you highlight I can't spell bass ;-)
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On 16/06/2017 22:56, John Rumm wrote:

That's the hard way.
Cut a piece of wood to fit across the back of the hole and put a bit of packing on the middle to bring it approximately flush with the front..
Get hole cutter in drill and make new hole.
Remove the piece of wood.
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On Fri, 16 Jun 2017 23:17:41 +0100, "dennis@home"

How do you hold it there?

Ok.

That's a pretty big hole cutter if you mean the 'tank' type so do you mean a fly cutter of some sort?

How did you hold it in in the first place?
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Easier generally to use a router and guide to cut out speaker holes.
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Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
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On 17/06/2017 00:12, Dave Plowman (News) wrote:

Well yes if you have a router.
Do one pass with a bearing on the bottom to leave a rebate and then put the bearing on the top and trim the rebate off.
Its a bit more expensive than some double sided tape, some scrap wood and a cheap hole cutter. It also depends on there being enough area for the base or using a router table.
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On 16/06/2017 23:17, dennis@home wrote:

ok if you have a 162mm hole cutter... (also see comments about not wanting a case full of sawdust)
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Your cabinets are totally glued together? Fairly rare, I'd say.
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Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
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On 17/06/2017 15:53, Dave Plowman (News) wrote:

Probably because of the transmission line path inside. The only access seems to be through the back panel connector block which is about 4" square and has the crossover on the back of it, and through the speaker cutouts and the end of the transmission line port.
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On 16/06/2017 23:17, dennis@home wrote:

To be fair I did consider routing out a "ring" of wood and just planting it on the face of the cabinet and sitting the speaker on that.
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On Friday, 16 June 2017 22:56:26 UTC+1, John Rumm wrote:

Router would have been my first choice, fwiw.
NT
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On Fri, 16 Jun 2017 16:20:52 -0700 (PDT), snipped-for-privacy@gmail.com wrote:

But aren't there lips on either side of the cabinet making the front face unflat? I guess you could pack the middle up to match?
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On 17/06/2017 00:29, T i m wrote:

There are, but one could make a flat template guide with the required hole in it and sit that on the top of the speaker. The use a bearing guided bit to follow it. If building new cabinets from scratch it would be the way to go.
Once working with an assembled case it would be hard not filling the case with chips though (which given its a reflex transmission line design (i.e. folded tapering wave guides), with copious amounts of wadding in it, would be difficult to get out since its all glued together)
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On Saturday, 17 June 2017 01:05:58 UTC+1, John Rumm wrote:

FWIW I was thinking of running it around freehand following the tape, but the objections are of course valid.
NT
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All you need is to provide a centre for your router guide if increasing the size of the hole. Any rebates needed (if say the speaker unit fits flush with the baffle) made first, before cutting the main hole. You may have to do some hand router work for fixing lugs etc.
I have a pretty cheap router hole cutter that came from Lidl that is just great for this. Most traditional routers can't go down to a small enough radius for things like tweeters. Neither of my other ones do.
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Dave Plowman snipped-for-privacy@davenoise.co.uk London SW
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"John Rumm" wrote in message

Interesting, but recently I have noticed just how buggered up my hearing is. Some music which used to sound so 'full' is now missing chunks of frequencies and the originals sound like poor imitations. This is very noticeable when hearing something from way back which I haven't heard for a long time :(
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