On Thu, 18 Jan 2007 16:06:14 -0000, "Keith G"
wrote:


"Don Pearce" wrote in message
...
On Wed, 17 Jan 2007 18:20:24 GMT, (Don Pearce)
wrote:

as they are a little larger and have easy, front access - see the
original
drivers on a nice, easily removed front baffle he

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


H3310s looks like a Seas pat number, but I can't find any info,
particularly the TS parameters, so I can't offer any help on box
design.

Ah - quite by chance I find that H3310s is not a driver, it is the
part number for the rubber surround, which is used on several drivers.
If you can find another part number somewhere, we might progress.



OK, skinning the rabbit(s) another way.....

I've taken the Ruark woofers (Vifa units, crude as **** to look at and 8
ohms apparently) out of the speakers I had put them in (Meraks) to replace
the ones a 'high current' Parasound amp had boiled up some time back and
dropped the Seas units in. The Vifas were good, the Seas are gooder - sounds
very nice and very 'bouncy' in the bass!! (Well usable for ss/digital I
would have thought and I doubt anybody would fault them as such - playing
right now: Yello 'The Eye' and they sound fine to me...)

Phase One complete.

Now for Phase Two:

I will now put the Ruark/Vifa woofers back in their own boxes (to keep all
the critics quiet about the TS stuff) and, using the Ruark crossover, will
fit the T27s in place of the Vifa tweets which were fried one night when
Shiny Nigel was round! That way I get 2 pairs of speakers from Rob's 1 pair
which (sorry Rob) were not even as good in the bass as the above-mentioned
Meraks!!

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.

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.

d

--
Pearce Consulting
http://www.pearce.uk.com