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Multi-Way Conventional loudspeakers with crossovers

Castle Harlech S2 front top (mid) driver x2 needed!
Castle Harlech S2 front top (mid) driver x2 needed!
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Old 25th June 2018, 03:01 PM   #1
dillinger is offline dillinger
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Default Castle Harlech S2 front top (mid) driver x2 needed!

Hi all!

Does anyone know of a suitable driver for Harlech S2s, being the mid driver? front fascia above the tweeter?

Any help or advice would be greatly appreciated.
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Old 25th June 2018, 05:28 PM   #2
EarlK is offline EarlK  Canada
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Click the image to open in full size.

Some backgrounding info for a possible fix!

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Old 25th June 2018, 07:49 PM   #3
dillinger is offline dillinger
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Ah thanks! Actually I've inherited some in great working order, except the drivers for both were replaced by inferior drivers. Looking to restore to former glory!
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Old 25th June 2018, 09:36 PM   #4
EarlK is offline EarlK  Canada
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Quote:
Originally Posted by dillinger View Post
Ah thanks! Actually I've inherited some in great working order, except the drivers for both were replaced by inferior drivers. Looking to restore to former glory!
For the sake of clarity;

How many drivers do you need per enclosure?

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Old 25th June 2018, 10:40 PM   #5
dillinger is offline dillinger
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Just one each. Top upward firing ones are fine, tweeters are fine! Just missing the front bass/mid drivers for each speaker.
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Old 25th June 2018, 11:14 PM   #6
EarlK is offline EarlK  Canada
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Ahh, thanks for that.

Internet info says that the top firing and front facing bass/mid drivers are one & the same driver.

If that's correct, then ( if mine ) I'd measure one of these existing drivers to get its' TS Parameters.

With those parameters in hand one could look for the closest match.

Maybe Castle would give out the TS parameters ( or suggest a replacement ) if you contacted them and explained your situation ( considering that apparently the drivers were made in-house and are no longer available > or < so says the internet ).

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Old 26th June 2018, 12:26 AM   #7
dillinger is offline dillinger
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I've been told in an email from Blue Aran Limited, that Wilmslow Audio officially recommend Monacor’s SPH-135C. Only about 52 sterling each, so will give them a whirl probably!
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Old 26th June 2018, 10:26 AM   #8
dillinger is offline dillinger
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So I've had the other drivers out. The top mounted drivers (06-55) are practically mint, as are the tweeters (08-19)! Why the other two 06-55s were removed from these I have no idea. I have sourced the last (06-55) available from the awesome gent who I believe used to work for Castle as still has some spares, but I think it's looking unlikely that I'll be able to find another 06-55 anywhere, unless someone somewhere on this forum has an utterly destroyed pair of Harlechs that they don't mind parting ways with a driver....
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Old 26th June 2018, 11:35 AM   #9
EarlK is offline EarlK  Canada
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Good Info,

FWIW, ( if you only have two of the original 06-55 to work with ) I'd put them facing your ears ( on the vertical face ) and the replacements, up on the horizontal ( top ).

Those Monacor's certainly look like a decent substitute.

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Old 26th June 2018, 02:20 PM   #10
system7 is offline system7  United Kingdom
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Good advice from EarlK there IMO.

People agonise over replacement drivers. Truth is they are all much the same. Seen one 5", you've pretty much seen them all.

Will it fit without too much woodwork? Looks like it might.

Monacor SPH-135C Size 133x133mm

Seems the Monacor SPH-135C is a reflex driver at Qts 0.39, so should work in a quarter wave line or reflex.

Using the Castle originals front facing seems like a plan. The top firing ones should not be too critical. Can't say if this is a two way TMM in effect, or a 2.5. You'd need to dissect the crossover to know that, and also to know what level adjustments are appropriate or possible.
Attached Images
File Type: png Monacor SPH-135C Chassis.PNG (45.8 KB, 95 views)
File Type: png Monacor SPH-135C.PNG (59.6 KB, 102 views)
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Best Regards from Steve in Portsmouth, UK.
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