I've got an old ( 5yrs) pair of recently obtained ATC SCM7 speakers.
Something sounded wrong from the off, and I think I've isolated it as a
faulty tweeter. One is distinctly louder than the other, and I can't
reliably differentiate the LF units, which seem much the same.

I've reached this conclusion by just connecting up the HF or LF
connectors on the speaker terminal panel. Swapped across
channels/sources/amps to rule out other issues.

Anyway, and assuming this test is reasonable, what might the problem
most likely be? Tweeter or crossover? And sourcing ATC units? Anything
like the Dynaudio closed shop of recent experience? I will contact them
at some point . . .

And another thing. I was doing some testing using a Windows XP laptop as
source - useful as I can use the software balance control in the native
sound mixer app. But how are you supposed to centre it? Seems very easy
to have it a click or two off centre.

Rob

Rob wrote in
:

I've got an old ( 5yrs) pair of recently obtained ATC
SCM7 speakers. Something sounded wrong from the off, and I
think I've isolated it as a faulty tweeter. One is
distinctly louder than the other, and I can't reliably
differentiate the LF units, which seem much the same.

I've reached this conclusion by just connecting up the HF
or LF connectors on the speaker terminal panel. Swapped
across channels/sources/amps to rule out other issues.

Anyway, and assuming this test is reasonable, what might
the problem most likely be? Tweeter or crossover? And
sourcing ATC units? Anything like the Dynaudio closed shop
of recent experience? I will contact them at some point . .
.

All above is WELL outside my realm of expertise.

And another thing. I was doing some testing using a Windows
XP laptop as source - useful as I can use the software
balance control in the native sound mixer app. But how are
you supposed to centre it? Seems very easy to have it a
click or two off centre.

But THIS nightmare I am VERY familiar with. WHY no click-to-
center-default on the bal/hi/lo controls?

Stupid ****ing Microsoft!


--
Any mental activity is easy if it need not be subjected to
reality.

Which flavour of Windows? I, being blind get numbers spoken and middle is
fifty percent. So the info must indeed be there some place.
Brian

--
Brian Gaff....Note, this account does not accept Bcc: email.
graphics are great, but the blind can't hear them
Email:
__________________________________________________ __________________________________________________ __________


"thanatoid" wrote in message
...
Rob wrote in
:

I've got an old ( 5yrs) pair of recently obtained ATC
SCM7 speakers. Something sounded wrong from the off, and I
think I've isolated it as a faulty tweeter. One is
distinctly louder than the other, and I can't reliably
differentiate the LF units, which seem much the same.

I've reached this conclusion by just connecting up the HF
or LF connectors on the speaker terminal panel. Swapped
across channels/sources/amps to rule out other issues.

Anyway, and assuming this test is reasonable, what might
the problem most likely be? Tweeter or crossover? And
sourcing ATC units? Anything like the Dynaudio closed shop
of recent experience? I will contact them at some point . .
.

All above is WELL outside my realm of expertise.

And another thing. I was doing some testing using a Windows
XP laptop as source - useful as I can use the software
balance control in the native sound mixer app. But how are
you supposed to centre it? Seems very easy to have it a
click or two off centre.

But THIS nightmare I am VERY familiar with. WHY no click-to-
center-default on the bal/hi/lo controls?

Stupid ****ing Microsoft!


--
Any mental activity is easy if it need not be subjected to
reality.

I gues the only way to tell crossover or speaker is to take them apart and
move the tweeters over between the units. That should give you the answer.
Brian

--
Brian Gaff....Note, this account does not accept Bcc: email.
graphics are great, but the blind can't hear them
Email:
__________________________________________________ __________________________________________________ __________


"thanatoid" wrote in message
...
Rob wrote in
:

I've got an old ( 5yrs) pair of recently obtained ATC
SCM7 speakers. Something sounded wrong from the off, and I
think I've isolated it as a faulty tweeter. One is
distinctly louder than the other, and I can't reliably
differentiate the LF units, which seem much the same.

I've reached this conclusion by just connecting up the HF
or LF connectors on the speaker terminal panel. Swapped
across channels/sources/amps to rule out other issues.

Anyway, and assuming this test is reasonable, what might
the problem most likely be? Tweeter or crossover? And
sourcing ATC units? Anything like the Dynaudio closed shop
of recent experience? I will contact them at some point . .
.

All above is WELL outside my realm of expertise.

And another thing. I was doing some testing using a Windows
XP laptop as source - useful as I can use the software
balance control in the native sound mixer app. But how are
you supposed to centre it? Seems very easy to have it a
click or two off centre.

But THIS nightmare I am VERY familiar with. WHY no click-to-
center-default on the bal/hi/lo controls?

Stupid ****ing Microsoft!


--
Any mental activity is easy if it need not be subjected to
reality.

"Rob" wrote in message
...
I've got an old ( 5yrs) pair of recently obtained ATC SCM7 speakers.
Something sounded wrong from the off, and I think I've isolated it as a
faulty tweeter. One is distinctly louder than the other, and I can't
reliably differentiate the LF units, which seem much the same.

I've reached this conclusion by just connecting up the HF or LF connectors
on the speaker terminal panel. Swapped across channels/sources/amps to
rule out other issues.

Anyway, and assuming this test is reasonable, what might the problem most
likely be? Tweeter or crossover? And sourcing ATC units? Anything like the
Dynaudio closed shop of recent experience? I will contact them at some
point . . .

And another thing. I was doing some testing using a Windows XP laptop as
source - useful as I can use the software balance control in the native
sound mixer app. But how are you supposed to centre it? Seems very easy to
have it a click or two off centre.

Rob

Try swapping the polarity of the input to the quiet tweeter (tweeter only!).

On 11/09/2010 19:33, Brian Gaff wrote:
I gues the only way to tell crossover or speaker is to take them apart and
move the tweeters over between the units. That should give you the answer.
Brian


Obvious when you know! Thanks Brian, did that, and it's the tweeter.
Ordered a new one from ATC.

Rob

Well its just a bit of logical elimination by substitution I guess. Mind you
I need to keep cleaning the switches in the crossovers of my tannoys as they
seem to cause intermittent treble after a few years despite being sealed in
a box.

Brian

--
Brian Gaff....Note, this account does not accept Bcc: email.
graphics are great, but the blind can't hear them
Email:
__________________________________________________ __________________________________________________ __________


"Rob" wrote in message
eb.com...
On 11/09/2010 19:33, Brian Gaff wrote:
I gues the only way to tell crossover or speaker is to take them apart
and
move the tweeters over between the units. That should give you the
answer.
Brian


Obvious when you know! Thanks Brian, did that, and it's the tweeter.
Ordered a new one from ATC.

Rob