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Old 19th September 2012, 07:41 AM   #1
Leeds is offline Leeds  Singapore
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Default My Castle Avon not sounding right

I bought a pair of Castle Avon used and the drivers and tweeters are working fine. I also examine the crossovers and the hi-pass and low pass-capacitors, inductors and resistors all look original and unmolested.

According to review by Gramophone (Review | Castle Avon loudspeaker | Page115 - April1997 - Gramophone Archive), the Avon could sound bright. The trouble with my Avon is that the tweeters are pretty soft and the brightness does not present. The HF is kind of lacking as compare with my Linn Kan I and Epos ES 11.

What could be the problem? The tweeters are definitely working. Is there a need to replace the hi-pass capacitors?

Perhaps, someone who is familiar with the Avon could share your experience. I am hoping that perhaps, the Avon simply sounded this way.
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Old 19th September 2012, 01:31 PM   #2
Joschl is offline Joschl  Germany
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Hi,
maybe the tweeters are fluid cooled and the fluid dried over the years. I had that in my B&W CDM1. The tweeter seems ok, but there is definitely something missing.
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Old 19th September 2012, 02:31 PM   #3
Leeds is offline Leeds  Singapore
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Quote:
Originally Posted by Joschl View Post
Hi,
maybe the tweeters are fluid cooled and the fluid dried over the years. I had that in my B&W CDM1. The tweeter seems ok, but there is definitely something missing.
Thamks Joschi for your sharing. The tweeter is fabric polyamide laminated soft dome unit. I am not sure if it is fluid cooled. If it is, what should I do? Did you replace the tweeters in your B&W CDM1?
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Old 19th September 2012, 03:02 PM   #4
palmas is offline palmas  Portugal
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Quote:
Originally Posted by Leeds View Post
Thamks Joschi for your sharing. The tweeter is fabric polyamide laminated soft dome unit. I am not sure if it is fluid cooled. If it is, what should I do? Did you replace the tweeters in your B&W CDM1?
I also bet it is the ferrofluid, you can remove it of replace the tweeters (I'm sure there are better tweeters for that speaker)
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Old 19th September 2012, 04:06 PM   #5
Bare is offline Bare  Canada
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Certainly Not discounting the possibility that there is damage to your Castles. However it could also be due to what you are familiar with.
IMO/auditions, Linn Kans were Horridly shrill things. Simply unpleasant.. period.
Definitely an Odd tonal balance, As are most Linn Speakers.
Made for old Scotties with impaired hearing?? :-) Dunno, but it's a common criticism.
But "kans' were the low water mark in harshness,IMO, even for Linn.
Not Any kind of a reference to judge other speakers by.
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Old 20th September 2012, 12:57 AM   #6
Leeds is offline Leeds  Singapore
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Quote:
Originally Posted by palmas View Post
I also bet it is the ferrofluid, you can remove it of replace the tweeters (I'm sure there are better tweeters for that speaker)
I confirmed that the tweeter is ferrofluid. So it seems likely that both the tweeters had dried out. Is this a common problem? Can the tweeters be serviced?

Last edited by Leeds; 20th September 2012 at 01:06 AM.
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Old 20th September 2012, 01:02 AM   #7
Leeds is offline Leeds  Singapore
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Quote:
Originally Posted by Bare View Post
Certainly Not discounting the possibility that there is damage to your Castles. However it could also be due to what you are familiar with.
IMO/auditions, Linn Kans were Horridly shrill things. Simply unpleasant.. period.
Definitely an Odd tonal balance, As are most Linn Speakers.
Made for old Scotties with impaired hearing?? :-) Dunno, but it's a common criticism.
But "kans' were the low water mark in harshness,IMO, even for Linn.
Not Any kind of a reference to judge other speakers by.
I never rule out this possibility since the Kans are obviously bright sounding. I had owned the Castle Pembroke which is similar to the Avon (one model down) and the Pembroke sounded much more open with better HF. Now that I confirm the tweeters are ferrofluid, the chances of them drying appears high.
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Old 22nd September 2012, 07:10 AM   #8
Leeds is offline Leeds  Singapore
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Just want to update about my experience with the Avon tweeters. I removed both the tweeters and found them contaminated with residues of the dry-out ferrofluid. I had both the voice coils cleaned and surronding gap holding the coils. I believe the tweeters are now without any ferrofluid or rather they have been playing "dry" since the day I bought the Avon.

The HF is now much more audible after the service. I am not so sure is the way the Avon should sound but am happy with the improvement. I may at a later stage sawp the tweeters for the Vifa DX27TG which appears to be the closest to the original.

I would be happy to hear from owners of Avon, Sterven or Isis which use the same tweeters.
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