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Old 20th June 2012, 12:12 AM   #11
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Quote:
Originally Posted by WaVeInFoRm View Post
You could buy a pair to take the drivers from.. Castle Chester speakers | eBay
I was going to say that's the price of a pair of speakers. But also that's what you will pay for a pair of (new) drivers.
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Old 20th June 2012, 06:01 AM   #12
bug2k11 is offline bug2k11  United Kingdom
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I did see those on eBay, but I would still be in the position of having another pair of cabinets left over which I would feel the need to do something with!

That Dayton Audio DATS looks interesting, I'll have to get one ordered. In the meantime I'll dig out the test equipment and see if I can measure the TS parameters of the other drivers I have.
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Old 20th June 2012, 12:50 PM   #13
system7 is offline system7  United Kingdom
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I'd get to work reverse engineering the crossover. Even capacitor values and layout can tell you a lot about how it works and the drivers. Looks like they've used Zobels a lot there on second order bass and third order tweeter.

It's a carbon fibre weave woofer, possibly low inductance. I'd fancy this Monacor SPH-170 Polycone (Le 0.45mH, Qts 0.44 Vas 41L) and a Seas 27TFFC tweeter. Plenty of room to manouvre there. You might even get lucky and find the existing crossover is close, but Zobel calculations are easy for both units.

Monacor SPH-170
Seas Prestige 27TFFC H881

Would sound like one of those classic BBC speakers.
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Old 22nd June 2012, 05:45 PM   #14
bug2k11 is offline bug2k11  United Kingdom
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The Dayton Audio DATS system just arrived so I've run it on the pair of drivers from another working set.

These are the results from each:

* Manufacturer: Castle
* Model: Chester
* Piston Diameter = 125.0 mm
* f(s)= 71.33 Hz
* R(e)= 5.49 Ohms
* Z(max)= 59.38 Ohms
* Q(ms)= 6.439
* Q(es)= 0.656
* Q(ts)= 0.595
* V(as)= 10.250 liters (0.362 cubic feet)
* L(e)= 1.00 mH
* n(0)= 0.54 %
* SPL= 89.43 1W/1m
* M(ms)= 10.27 grams
* C(ms)= 0.48 mm/N
* BL= 6.21

* Manufacturer: Castle
* Model: Chester
* Piston Diameter = 125.0 mm
* f(s)= 66.62 Hz
* R(e)= 5.55 Ohms
* Z(max)= 63.98 Ohms
* Q(ms)= 5.847
* Q(es)= 0.555
* Q(ts)= 0.507
* V(as)= 11.420 liters (0.403 cubic feet)
* L(e)= 0.85 mH
* n(0)= 0.58 %
* SPL= 89.74 1W/1m
* M(ms)= 10.57 grams
* C(ms)= 0.54 mm/N
* BL= 6.65

I'm surprised there's so much difference between the two drivers. I'll take a look at the crossovers later and draw them up.

I would appreciate any advice on drivers which might make good replacements.

Thanks.
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Old 23rd June 2012, 01:55 AM   #15
sreten is offline sreten  United Kingdom
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Originally Posted by bug2k11 View Post
I'm surprised there's so much difference between the two drivers.
I'll take a look at the crossovers later and draw them up.

I would appreciate any advice on drivers which might make good replacements.

Thanks.

Hi,

There really isn't that much unusual difference, given the vagaries of the
suspension, which in a real box make far less difference than the specs.

rgds, sreten.
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Old 23rd June 2012, 02:12 AM   #16
sreten is offline sreten  United Kingdom
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ELAC 5 inch hifi bass speakers woofers NOS PAIR KEF JPW | eBay


Hi,

Might be workable as a cheap get going, after that your expensively on your own.
The differences in parameters are not as significant as they appear, in reality.

rgds, sreten.
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Last edited by sreten; 23rd June 2012 at 02:15 AM.
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Old 25th June 2012, 04:55 PM   #17
bug2k11 is offline bug2k11  United Kingdom
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I've scribbled down the layout of the crossover
Click the image to open in full size.


How does this scanspeak driver look as a replacement?
Scanspeak Discovery 18W 8424G00

Thanks
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Old 25th June 2012, 06:17 PM   #18
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Originally Posted by system7 View Post
It's a carbon fibre weave woofer
The woofer pictured in Post 1 is coated paper.

dave
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Old 25th June 2012, 06:21 PM   #19
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Quote:
Originally Posted by bug2k11 View Post
How does this scanspeak driver look as a replacement?
At what drive level did you measure the Castle's T/S?

To get an accurate compare you'll need to do it in a similar range to the factory measures (probably 1V @ 400 Hz into your reference 8R resisiter.

Re the Scan, I'd stick with a coated paper cone driver (or coat a paper cone driver)

dave
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Old 25th June 2012, 06:32 PM   #20
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The driver reminds me somewhat of some of Volts smaller coated paper cone drivers. They don't make anything in this size though so it could have been a custom made.

As you're able to measure T/S parameters, buying a similar spec driver would be a good starting point. If any of Audax's AM/HM range will fit in the cut out and fit the specs then they would probably be okay, but expect to have to do crossover work to get things sounding right.

If you could take one of the drivers out of the cabinet and give us pictures of the rear of the basket and the motor, it might help us identify the manufacturer.
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