Don Pearce wrote:
On Thu, 18 Jan 2007 16:59:10 -0000, "Keith G"
wrote:

"Don Pearce" wrote in message
...
On Thu, 18 Jan 2007 16:06:14 -0000, "Keith G"
wrote:

Now, am I just hitting lucky so far or can you really *not* just chuck
anything about the same size in? Also, I am suspecting tweeter differences
of the same type and size are almost neglible...??

OK, we'll see - not so easy now, it's getting a bit
*gynaecological*......!!
:-)

Mora non....


When you have drivers of the same size and general type, you've got a
fighting chance that their resonances will fall at somewhere near the
same frequency, and that is what matters. The tolerance of frequency
between two drivers that are nominally the same is pretty wide anyway.


OK, that's the gamble I took, but the first pair are still on and really do
sound good - I might grab a snatch off 'em and post it later....


I don't know the difference between the T27s and the Vifas, but the
important thing with tweeters is not to give them stuff that is lower
than they can cope with - that is the road to early death. I think you
should be pretty safe with the T27s though.


Right, hint of 'non-peachyness' creeping in to the equation - scrute these
pix:

http://www.apah69.dsl.pipex.com/show/tweeterpic01.JPG

http://www.apah69.dsl.pipex.com/show/tweeterpic02.JPG

http://www.apah69.dsl.pipex.com/show/tweeterpic03.JPG

and you will see:

1) Sawdust everywhere 'cos one of the Seas drivers dropped in to the other
speakers reet lovely and the other one rocked a bit and had to be 'let in' a
tad!

2) The Vifa woofer looking smug - back *home*...

3) That the Vifa tweeter is only 6 oms...!!??


Well, the Vifa is often recommended as an upgrade for the T27, so I
really wouldn't be too fussed about the impedance difference. Just be
prepared for it to be a bit on the loud side, though - you may need a
series resistor yet.

Now, is '3' going to represent a big problem crossoverwise? - I'm intending
to use the original Ruark crossover and the T27 is 8 ohms, as you can
see/already knew....

Nope, don't worry about that.

My money's on them sounding OK, but I don't know what to expect from the
T27's higher rating - 'vanishingly' less treble? A small but devastating
explosion? Loss of libido....?? Dry skin...??

Incidentally, when I fried the tweeter I contacted Ruark and some old dear
told me I got *no chance* of a replacement - old model and all the bloody
drivers (Focal, Dynaudio, Vifa in various models, to my knowledge) are
non-standard, 'Ruark tweaked' apparently!! I asked about using a 'near miss'
tweeter and got a *telephone shrug*...!! :-)



A shrug is all you will get from anyone. For sure they are going to
work a sight better than a busted pair of Vifas - although it may be
worth your while seeing f they can be fixed. They're rated and worth
money.

d

Apart from good old Wilmslow, drive units including tweeters can be
repaired/reconed by
http://www.loudspeakersonline.com/re....new/index.htm

They say a typical tweeter recone costs £30. Interestingly, I can't
find any reference to the D25.TG-85 tweeter on the Vifa web site, so
maybe it was produced only as an OEM item.

S.

S.