Speaker Faceplates

[The Natural Philosopher]

One of the tweeters of my 20 year old ATC SCM10 speakers appears broken - it's
a lot quiter than the other.

Ah. Have you tried swapping it with is opposite number? Its rare for a
tweeter to fail by volume.
If it is genuinely quieter, can you get a replacement dome and voice coil?

Or is the coil rubbing? dismantle and fiddle?

I've contacted ATC - they can supply replacements at about £130. Or I can buy
what they tell me is the same thing - D27TG-35-06 tweeter, by Vifa - elsewhere

OK. lookes like a nice silk dome tweeter with some power hanfling capability

The faceplate of the ATC tweeter is circular, cut level at the bottom, to sit
flush with the woofer. The Vifa is circular. Is it a simple matter to swap the
faceplates and use the original ATC plate with the Vifa gubbins?

Ah. I had that problem. With a pair of failed 44 year old Spanish mid
range units. I managed to just get replacements from Australia, - new
old stock - BUT they had black anodised faceplates. Mine were brushed...

Noprobs. I though,. I'll just swap them

The screw holes didn't line up...I was already £250 into this repair...

I scratched my arse and phoned a friend, yes, he could 3D print an
adapter ring that fitted both halves...so he did and it all went
together perfectly with the mid range done simply set back about 4mm.

There's an equivalent of the (Chinese) Vifa built in Denmark by Scanspeak for
about £10 more. Would it be worth the extra?
https://audio-database.com/ATC/speaker/scm10.html

Well it is. like my mid range units, a three hole fixing.

If the pitch circle is the same, you are in business, If it isn't you
will have to do what I did, and beware, the front plate may be actually
holding in the tweeter dome and voice coil and this has to be accurately
located. Therefore your adapter ring will need to take that into account
if used.

https://willys-hifi.com/products/peerless-d27tg35-06-tweeter
Also posted to uk.rec.audio

One more caution. I have replaced tweeter domes in two sets of
loudspeakers, In both cases the repaired tweeters now sound different.
But not enough for me to bother to fit the second replacement domes
(they came in pairs) to the other.

Knowing what I now know, I would buy *two* replacement tweeters at the
low price and swap the faceplates. I feel 99% sure they will be a
straight swap.

I am just pointing out that they *might* not be.

[John Rumm]

One of the tweeters of my 20 year old ATC SCM10 speakers appears broken - it's
a lot quiter than the other.
I've contacted ATC - they can supply replacements at about £130. Or I can buy
what they tell me is the same thing - D27TG-35-06 tweeter, by Vifa - elsewhere
The faceplate of the ATC tweeter is circular, cut level at the bottom, to sit
flush with the woofer. The Vifa is circular. Is it a simple matter to swap the
faceplates and use the original ATC plate with the Vifa gubbins?

Looking at your photos, it *appears* so, assuming the mounting holes
that fix the bezel to the driver are in the same place.

However you could probably just cut the bottom of the circle off the new
ones to fit if the fixings don't line up :-)

There's an equivalent of the (Chinese) Vifa built in Denmark by Scanspeak for
about £10 more. Would it be worth the extra?

IME the Vifa ones are not bad... I acquired some speakers that had
similar tweeters, and one was knackered (I think the previous owner had
blown a crossover, and then tried wiring the drivers direct to the
input. I expect the tweeter demonstrated its displeasure by letting the
magic smoke out!). The working side sounded good though. I sourced some
Morel MDT 30S units to replace them since I could not find an exact
match at the time. Turns out they were an easy swap.

https://audio-database.com/ATC/speaker/scm10.html
https://willys-hifi.com/products/peerless-d27tg35-06-tweeter

--
Cheers,

John.

/=================================================================\
| Internode Ltd - http://www.internode.co.uk |
|-----------------------------------------------------------------|
| John Rumm - john(at)internode(dot)co(dot)uk |
\=================================================================/

[RJH]

Post by John Rumm

One of the tweeters of my 20 year old ATC SCM10 speakers appears broken - it's
a lot quiter than the other.
I've contacted ATC - they can supply replacements at about £130. Or I can buy
what they tell me is the same thing - D27TG-35-06 tweeter, by Vifa - elsewhere
The faceplate of the ATC tweeter is circular, cut level at the bottom, to sit
flush with the woofer. The Vifa is circular. Is it a simple matter to swap the
faceplates and use the original ATC plate with the Vifa gubbins?

Looking at your photos, it *appears* so, assuming the mounting holes
that fix the bezel to the driver are in the same place.

I'm just wondering if anything's glued, or it's a reasonably simple case of
removing the screws.

Post by John Rumm
However you could probably just cut the bottom of the circle off the new
ones to fit if the fixings don't line up :-)

Ah, hadn't thought of that! For the sake of £200+, definitely.

Post by John Rumm

There's an equivalent of the (Chinese) Vifa built in Denmark by Scanspeak for
about £10 more. Would it be worth the extra?

IME the Vifa ones are not bad... I acquired some speakers that had
similar tweeters, and one was knackered (I think the previous owner had
blown a crossover, and then tried wiring the drivers direct to the
input. I expect the tweeter demonstrated its displeasure by letting the
magic smoke out!). The working side sounded good though. I sourced some
Morel MDT 30S units to replace them since I could not find an exact
match at the time. Turns out they were an easy swap.

The treble is the speaker's main (but small) limitation IMHO - it's a bit
'obvious'. But the bass/mid more than make up for it.

Once I've properly ruled out the crossover, checked the dimensions, etc. I'll
order a couple of the Scanspeaks.

Post by John Rumm

https://audio-database.com/ATC/speaker/scm10.html
https://willys-hifi.com/products/peerless-d27tg35-06-tweeter

[RJH]

Post by The Natural Philosopher

One of the tweeters of my 20 year old ATC SCM10 speakers appears broken - it's
a lot quiter than the other.

Ah. Have you tried swapping it with is opposite number? Its rare for a
tweeter to fail by volume.

No, not yet - but I will. reasonably convinced it's the tweeter though -had a
similar failure on a similar speaker (SCM7s)

Post by The Natural Philosopher
If it is genuinely quieter, can you get a replacement dome and voice coil?
Or is the coil rubbing? dismantle and fiddle?

I'll have a go! But for the price I think the replacement is probably safest.

Post by The Natural Philosopher

I've contacted ATC - they can supply replacements at about £130. Or I can buy
what they tell me is the same thing - D27TG-35-06 tweeter, by Vifa - elsewhere

OK. lookes like a nice silk dome tweeter with some power hanfling capability

The faceplate of the ATC tweeter is circular, cut level at the bottom, to sit
flush with the woofer. The Vifa is circular. Is it a simple matter to swap the
faceplates and use the original ATC plate with the Vifa gubbins?

Ah. I had that problem. With a pair of failed 44 year old Spanish mid
range units. I managed to just get replacements from Australia, - new
old stock - BUT they had black anodised faceplates. Mine were brushed...
Noprobs. I though,. I'll just swap them
The screw holes didn't line up...I was already £250 into this repair...
I scratched my arse and phoned a friend, yes, he could 3D print an
adapter ring that fitted both halves...so he did and it all went
together perfectly with the mid range done simply set back about 4mm.

There's an equivalent of the (Chinese) Vifa built in Denmark by Scanspeak for
about £10 more. Would it be worth the extra?
https://audio-database.com/ATC/speaker/scm10.html

Well it is. like my mid range units, a three hole fixing.
If the pitch circle is the same, you are in business, If it isn't you
will have to do what I did, and beware, the front plate may be actually
holding in the tweeter dome and voice coil and this has to be accurately
located. Therefore your adapter ring will need to take that into account
if used.

https://willys-hifi.com/products/peerless-d27tg35-06-tweeter
Also posted to uk.rec.audio

One more caution. I have replaced tweeter domes in two sets of
loudspeakers, In both cases the repaired tweeters now sound different.
But not enough for me to bother to fit the second replacement domes
(they came in pairs) to the other.
Knowing what I now know, I would buy *two* replacement tweeters at the
low price and swap the faceplates. I feel 99% sure they will be a
straight swap.
I am just pointing out that they *might* not be.

Yep, good thinking, I'll check the measurements carefully.

[SteveW]

Post by RJH

Post by The Natural Philosopher

One of the tweeters of my 20 year old ATC SCM10 speakers appears broken - it's
a lot quiter than the other.

Ah. Have you tried swapping it with is opposite number? Its rare for a
tweeter to fail by volume.

No, not yet - but I will. reasonably convinced it's the tweeter though -had a
similar failure on a similar speaker (SCM7s)

Crossover may be a possibility too.