Advice - Replacement drivers for Castle Chester speakers - diyAudio
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Old 19th June 2012, 03:38 PM   #1
bug2k11 is offline bug2k11  United Kingdom
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Default Advice - Replacement drivers for Castle Chester speakers

I have a pair of Castle Chester speakers that have no mid/bass drivers. As they are an unusual almost octagonal design and the original Castle company ceased trading some years ago, it doesn't look like it's going to be possible to get replacements.

I am thinking of taking the opportunity to modify the recessed driver mounting into a slightly larger circular hole and could use some advice as to which drivers might be a suitable upgrade. It might be a good time to upgrade the tweeters at the same time, these are Vifa D25AG-05, which are 104mm across.

I have linked in some pictures of the speakers here:
Click the image to open in full size. Click the image to open in full size. Click the image to open in full size. Click the image to open in full size.

The diameter of the rounded octagon of the mid/bass driver is 177mm.

As I already have two other working pairs of the Chester speakers, this might be an interesting project to see how much they could be improved with different drivers and possibly crossovers.

Any advice and help would be appreciated.
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Old 19th June 2012, 04:30 PM   #2
kevinkr is offline kevinkr  United States
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Since you have two other pairs the obvious starting point would be to remove and measure the TS parameters of one or more of the woofers as this would allow you to select an acceptable alternative for the existing box tuning.

Once you've done that alternate tweeter choices should be more obvious.

Note that you may possibly need to redesign the XO unless you are lucky enough to come across woofers that are a very close match to the originals.
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Old 19th June 2012, 04:52 PM   #3
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Maybe you should look for a well proven design with new drivers.How about the Amiga?https://sites.google.com/site/undefinition/diy/amiga
You could add new baffle to your cabs like this.
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File Type: jpg AndertonAmigaspeaker2.jpg (432.3 KB, 219 views)
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Old 19th June 2012, 07:34 PM   #4
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Actually both routes are possible.
1. Using similar drive(s) to save xo.
2. Starting with the internal volume of the speaker , and choosing a driver/kit that works with that size of speaker (new drivers and crossover in this case).
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Old 19th June 2012, 08:02 PM   #5
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Can you measure the front of your mid-woofer (to the millimeter). Width and depth of the chassis.
I see you have here (edit)
Quote:
The diameter of the rounded octagon of the mid/bass driver is 177mm.
Other (Castle) replacements are mentioned from time to time; SEAS, others.
Replacement for SEAS Chassis with XP and Polypropylene Cones
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Last edited by Inductor; 19th June 2012 at 08:07 PM.
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Old 19th June 2012, 08:26 PM   #6
DrBoar is offline DrBoar  Sweden
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The Vifa is a very good tweeter and so reusing that would be good.
Spending 100 bucks on a Parts-express DATS to measure both drivers and crossovers. With such a tool you can have a shot of getting an (almost) drop in replacement driver.
Otherwise go for a kit
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Old 19th June 2012, 09:05 PM   #7
bug2k11 is offline bug2k11  United Kingdom
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Thanks for the replies, I'll pull one of the other drivers and measure the drivers TS parameters and see if there's anything similar that can be made to fit. Shouldn't be too much trouble to enlarge the recess to fit a 6.5" circular speaker. The maximum mounting depth is about 100mm as there seems to be a vertical divider which slopes down to meet the front panel just above the vent, a quick search seem to imply this speaker cabinet uses a quarter wave design.
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Old 19th June 2012, 11:07 PM   #8
sreten is offline sreten  United Kingdom
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Hi,

You are going to be hard pushed to improve on the original, with a
fairly complex x/o matched to the drivers and a bass mid matched
to what is presumably an (expanding?) 1/4 wave line.

rgds, sreten.
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Old 20th June 2012, 12:01 AM   #9
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You could buy a pair to take the drivers from.. Castle Chester speakers | eBay
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Old 20th June 2012, 12:10 AM   #10
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I don't have (any) experience with quarter wave, and after this note I'm curious if this chassis is not of the same dimensions or close to the Audax.
This a good driver for 1/4 wave anyway. Audax AM170G8
Parameters: Qtsb 0.365, Fsb 42.46
Calcul. Units MKSA: 0.20 <= Qtsb <= 0.70, 20 <= Fsb <= 70 Hz
(ps: In the case of having interest in this driver, if someone finds these parameters, for the Audax, of note)
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