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Old 8th January 2013, 12:26 PM   #621
sippy is offline sippy  United Kingdom
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Default Further Fiddles

Happy New Year All
An up-date:
For the last two weeks I've been mucking about with tweeters.
(1) The Fostex FT17H were connected up and I swapped caps in and out, tried them in their hole below the 12Lta, on the 'top deck' inside through to outside, toed strait/in/out, in and out of phase, then a borrowed pair of L-pads to see what happened....... things got far better with a much reduced output BUT still sounded wrong - still cant put my finger on or describe why this is so, I've had dealings with this tweet before and things were good, though I must add that it was a far older version.
So I concluded that, for MY ears, that the tweeter was wrong.
Time to improvise.
(2) I tried the 'plastic' (for want of a better word/description) tweeters of about 19/20mm dia rescued from a pair of MS10.1's again, with various caps.
They sounded as horrid as before.

(3) I then tried the 25mm dia metal domes that reside in my 'out going' 2.5 way towers with various caps and things got a bit better, nothing startling, nothing offensive and no reason to keep them blu-tacked/precariously balanced on the top deck.

(4) Pair of tweeters made by Wharfdale, rescued from a dinky pair of Diamond 2 way towers that had water damaged cabinets, model number '0318A' 25mm/1 inch fabric dome of unknown sensitivity. I went strait for 2.2mfd and that sounded a lil weird, so I spent the next two days 'choco blocking' caps / wire in and out and have finally settled on the initial value of 2.2mfd with 18ga copper wire stripped from an unknown value cross-over coil.
All I can conclude is that the out-put of the tweeter / crossing cap is just right, there is still a slight roughness to the upper reaches of the 12Lta, but then short of doing a proper cross-over..... occasional 'scratchy-ness that was there before adding tweeter, revealed by pluffing, just a bit of 'character' as I believe Godzilla said
Here is a link to a 'bay seller of these tweets: Wharfedale Model 0318A Tweeter (used in Diamond Series) Brand New | eBay

These have now been in system for a week, Will's and other friends have listened to them and said there is a huge improvement with the pluff / Wharfdale tweeters.
With my venerable and freshly fettled / restored Cyrus 2 / PSX / CD63Ki hooked up, Claire Jones's harp is tight and HUGE, Holly Cole has lost the 'cuped / breathing through a veneer tube' and sounds.... everything that gets played sounds better, Even my sim-racing sounds astonishing, a Ferrari F430-GT3 round Monaco, into Grand Hotel hairpin one gets the diff winding up on down-shift into 1st gear, big brakes going 'Shssksssss' and the tires all a twitter.... Yesterdays Race Club event at Spa Francorchamps was a full GT3 field BMW M6/Z4, Audi R8, F458, Gallardo LP600, Merc SLS, 997 etc 60min sprint race....... one of my neighbours said it sounded like the race was running round the village!
I'm totally and utterly chuffed with my Emkens.
And there's a bit of good news about the 'Thick Felt' - a surfer friend runs an upholstery busyness and can get by the roll, so there could be a chance I can help others obtain the correct stuff in the UK

Last edited by sippy; 8th January 2013 at 12:28 PM. Reason: spelling error
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Old 27th January 2013, 04:27 PM   #622
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Sippy
Thx for the shout out. im still looking into them as mains. the whole idea intrigues me.
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Old 22nd March 2013, 11:20 PM   #623
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Quote:
Originally Posted by sippy View Post
Well, earlier today I delved my hand into the bag of 'pluff', teased what I thought was a suitable amount for one driver and thought 'how to ensure equality?'
....Borrowed a pair of electronic scales that weigh in .01 grams, weighed the pluff at 1.7g, teased and weighed a second dose out, teased it out and had to used more force than expected to get it betwixt whizzer and the main cone.

Top mod, Lady GaGa's The Fame becomes, for the first time, really really easy to listen to.
You know, I cant be diddled with too much gushing 'Blah de Blah', so in Short:
The whizzer must have a HUGE output in its working range, even going by the posted graphs, both for stock and modded drivers, don't really tell the whole story. The effect of killing off the reflected rear out put is not subtle, EmKen on its own with (my) current porting DOES DO SKANKY BASS!
It was masked by the whizzers output!
Claire Jones's harps long strings, at last, go 'Plommmbbbbb'.
One can hear the odd 'wibble' as the Lta gets right up the freq range, I can accept that because everything else is 'Just Right'.
I've been listening for near 7hrs without fatigue and I wish I could listen for another 7 - pity I've got to curfew cos the lil lass who lives above is near her bed-time.

Thanks Dave..... so worth the pains and waiting.
Etocynedd, pity you didn't get in on this from the get go - I'll assure you here and now that if you buy the plan-set, build with even half decent ply and do the mods detailed in this thread, YOU WILL NOT BE DISAPPOINTED.
You'll learn a heap and have fun too
Holy i bet!
I had big dreams of doing this, but it seems the money finds a hole to go down.

I still intend to do them, ill definitely buy a set and build them.
the whole resistively ported concept intrigues me.

The most astounding sound i've heard has always been large drivers or the original instruments.

Any pics anywhere?
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Old 24th March 2013, 06:13 AM   #624
GM is online now GM  United States
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Quote:
Originally Posted by sippy View Post
The whizzer must have a HUGE output in its working range
Of course, just compare its size Vs one on a Fostex or similar driver. Just like a horn, the bigger it is, the lower in frequency it begins 'sounding off', comb filtering with the diaphragm's output.

GM
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Old 30th March 2013, 12:29 AM   #625
sippy is offline sippy  United Kingdom
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Here's a pic, only of the one because my flat has turned into a total 'man cave' since my gf and I moved in to 'our abode'.
There is a phase plug in there, unfortunately the borrowed cams battery decided to die when the flash was turned on and the plug has a dark enough red tone to become invisible under room lighting.
They still remain slightly un-finished as I am slooooowly working on low Fq reinforcement ideas.......
LAB12 in an EmKen shaped / size box, BR ported
LAB12 type horns (stock 3 fold or 2 fold special)
15" or 18" in big (huge!) sealed boxes
The 12lta takes A LOT of running in, free air them for a bit, put them in the cabinets and then find a place where you can give them a damn good thrashing. I say this because after the times mine have been beaten a bit, they sound a bit better.
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