Hi There

I've a Naim Nait3 which I have had for a couple of years and have found
to be a very capable amplifier.

I do have one question though, which may sound a bit "dumb" but I
really don't know if this should happen or not.

When I switch the amp on, I hear a sort of "pop" sound from the
speakers, then a pause before another similar sound, it's only after
the second "pop" that I can hear anything coming through from any of
the inputs.

Also, when I turn the amp right down I can hear a quiet hiss coming
from the speakers.

Is this all normal behaviour or does the amp have a problem?

Thanks
Jon

wrote in message
oups.com...
Hi There

I've a Naim Nait3 which I have had for a couple of years and have found
to be a very capable amplifier.

I do have one question though, which may sound a bit "dumb" but I
really don't know if this should happen or not.

When I switch the amp on, I hear a sort of "pop" sound from the
speakers, then a pause before another similar sound, it's only after
the second "pop" that I can hear anything coming through from any of
the inputs.

Also, when I turn the amp right down I can hear a quiet hiss coming
from the speakers.

Is this all normal behaviour or does the amp have a problem?

Thanks
Jon


Two questions he- The easy one is the hiss, yes that's normal for all
amplifiers, there will be a little hiss. How audible it is depends on how
much hiss, and how efficient your 'speakers are. Into horns, even a little
hiss from the amplifier is audible, into "normal" speakers, it should be
inaudible at the listening position, and only noticeable if you are close,
say less than 50cm, from the 'speaker.

Regarding the pop, firstly, it's quite normal, several amplifiers do it, I
would only be concerned if it has previously never done it, and only just
started. Basically, the pop is caused by the amplifier stabilising when
switched on. Amplifiers with split supply rails and no output capacitor will
not necessaily come up totally symetrically, so some out-of-balance current
will flow through the loudspeaker, causing a pop. Amplifiers with a coupling
capacitor will have the capacitor charging current going through the
loudspeaker, causing a pop. There may be a similar pop on switch-off.

I'm not familiar with the specific circuit of the NAIT3 so I don't know if
it has relay switching of the 'speakers which could account for the two
pops, separated by a few seconds. If it has always done it, it's not
something I would worry about if the 'speaker cones don't move violently
with the pops. No damage will result, just a mild annoyance. If, however,
the 'speaker cones move violently in or out with the pop, then I would have
the amp seen to, as it's likely to be a fault, and could well damage the
'speaker suspension.

S.

In article , Serge Auckland
wrote:

wrote in message
oups.com...


Also, when I turn the amp right down I can hear a quiet hiss coming
from the speakers.


The easy one is the hiss, yes that's normal for all amplifiers, there
will be a little hiss. How audible it is depends on how much hiss, and
how efficient your 'speakers are. Into horns, even a little hiss from
the amplifier is audible, into "normal" speakers, it should be inaudible
at the listening position, and only noticeable if you are close, say
less than 50cm, from the 'speaker.

FWIW for the last 20+ years I've tended to regard it as unncessary for a
power amp to produce levels of hiss that are audible even with your ears
close to the speaker. However I'd agree this isn't unusual, and is
'harmless' if it can't be heard in the normal listening position. With the
amps I use it is therefore 'normal' for no hiss to be audible even if your
ear is just an inch or two from the speaker. But otherwise I'd agree with
what Serge wrote.

Slainte,

Jim

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