On Wed, 17 Jan 2007 18:01:28 -0000, "Keith G"
wrote:


"Don Pearce" wrote


Without being able to trace the circuits I can't say for definite, but
that looks like a second order crossover. Are those chokes wound on
ferrite? If they are, this crossover has a power limit set by the
magnetic saturation of the ferrite. Your other one is a better way of
making a crossover choke.


OK, here's a pic of both sides of that crossover:

No, here's a couple of pix showing each side of that crossover:

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

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

No, it was too hard to trace from those, but assume they were built on
advice from the driver makers, and they are basically OK.


The game plan is as follows:

Dr Rob very kindly gave me these speakers

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

which sound fine but are easily beat by most (all, actually) of the other
spreakers I have here, due to a lack of any bass at all. I want to pull the
drivers (T27s and H3310s) out of 'em and use them in these boxes:

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


OK, if you are telling me they lack bass, I will certainly believe
you!

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.


(Rob - speak now if you would rather have these back instead of me
cannabalising them!)


The idea is to fit the drivers into the boxes (which I will modify hugely
with a second skin and some crossbracing) using the Ruark crossover, leaving
Rob's 'donor' speakers as intact as possible (for a possible
reversal/restoration) and trying a few different drivers (if necessary)
until I can convince myself I have a pair of unique, stunning 'homebrew'
standmounters that blow away any commercial equivalent at many times the
price.....

;-)

(Or find, for only a little work, if I'm ****ing in the breeze!!)



I don't think you will get much joy by simply putting them in that
other box; the chances of it being the right size are pretty remote.
And then of course there is the port design to consider. I'll keep on
looking, though.

d

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