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From: bleader on 8 Jun 2010 10:29
Hi there,

I've got a marrantz SR 4003 at home, which seems to go easyly into
protection mode.

First the setup:

- Marrantz SR 4003
- Jamo S606 HCS (5.0 setup), columns have passive "sub"
- no active sub
- optical input, raw dts soundtrack sent to the device

When watching movies on this setup I found that without an active sub
basses were a little weak, so I pushed the bass to the max (+6dB IRC).
I was watching a movie at -30dB (not that much on a range of -81/+15),
and at a point where there was quite some bass, the marrantz went into
protection mode. From the documentation, there are 2 different
protection modes, this one (8 flash per second) being the one where
you're supposed to bring back the hardware to the store for repair.

This is what I did, but curious as to know if the issue was solved, I
tried the exact same setup when it came back from the store... and the
same thing happened.

Now it's once again back from repair, but I'm not very keen on trying
out yet again without knowing how to reset the protection by myself.
Warranty runs out soon, and I don't really want to bring it back to and
wait the 3 weeks they take to send it back and forth to the proper
repair place.

So here I go with the questions:

1/ Does anyone know the get out of protection mode procedure for this
model ? Is it some kind of switch to reset or fuse to change, or is it a
more complex procedure ?

2/ Any idea why this happens ? My Jamo are 6ohms, but the SR4003 is
supposed to support it (as 6ohms output power is provided in the
specifications). I listened to music or watched movies without any
problem prior to this, even quite loud.

Any help is welcome :)

--
bleader
From: Cydrome Leader on 8 Jun 2010 12:10
bleader <bleader(a)ratonland.org> wrote:
> Hi there,
>
> I've got a marrantz SR 4003 at home, which seems to go easyly into
> protection mode.
>
> First the setup:
>
> - Marrantz SR 4003
> - Jamo S606 HCS (5.0 setup), columns have passive "sub"
> - no active sub
> - optical input, raw dts soundtrack sent to the device
>
> When watching movies on this setup I found that without an active sub
> basses were a little weak, so I pushed the bass to the max (+6dB IRC).
> I was watching a movie at -30dB (not that much on a range of -81/+15),
> and at a point where there was quite some bass, the marrantz went into
> protection mode. From the documentation, there are 2 different
> protection modes, this one (8 flash per second) being the one where
> you're supposed to bring back the hardware to the store for repair.
>
> This is what I did, but curious as to know if the issue was solved, I
> tried the exact same setup when it came back from the store... and the
> same thing happened.
>
> Now it's once again back from repair, but I'm not very keen on trying
> out yet again without knowing how to reset the protection by myself.
> Warranty runs out soon, and I don't really want to bring it back to and
> wait the 3 weeks they take to send it back and forth to the proper
> repair place.
>
> So here I go with the questions:
>
> 1/ Does anyone know the get out of protection mode procedure for this
> model ? Is it some kind of switch to reset or fuse to change, or is it a
> more complex procedure ?

don't overload the amp. From what I can tell, it's rated 80watts per
channel into 8 ohms. The spec sheets shows 6-8 ohm is acceptable, and you
have 6 ohm speakers. Driving the bass up will either burn it out or send
into protection mode.

I've not ripped the amp apart so I can tell you how it's reset or fixed.
Running the bass turned up into all the channels will draw quite a bit of
power, as it's pretty close to just passing DC into the speaker, and the
current draw can be pretty high. Years ago they'd just put a fuse on the
rear you could replace yourself. Easy "service" and "repairable" are a
forgotten concepts these days though.

> 2/ Any idea why this happens ? My Jamo are 6ohms, but the SR4003 is
> supposed to support it (as 6ohms output power is provided in the
> specifications). I listened to music or watched movies without any
> problem prior to this, even quite loud.

see above. turn the bass down, get a separate speaker or get a giant amp.

From: William R. Walsh on 8 Jun 2010 13:20
Hi!

> When watching movies on this setup I found that without an active sub
> basses were a little weak, so I pushed the bass to the max (+6dB IRC).

You shouldn't do that. If you want more bass, get a separately powered
subwoofer unit and use that.

The power amplifier in your Marantz unit probably isn't built to take
that kind of stress repeatedly, and the fact that the protection kicks
in is trying to tell you that, before something blows up permanently.
I doubt there is any lasting damage taking place, just the logic in
the unit is locking out normal operations until the protection circuit
is reset.

The service manual would probably tell you how to reset the
protection. It's likely that there is a hidden service menu or
keypress combination. Seriously, though, DO NOT just reset the unit
every time it trips out.

> 1/ Does anyone know the get out of protection mode procedure
> for this model ?

No, but even if you find out, you should stop doing what you are
doing. The unit is trying to tell you that it can't keep up with what
you're asking it to do. You either need a beefier amplifier or a
dedicated and separately powered subwoofer.

> 2/ Any idea why this happens ?

Yes. You are exceeding the safe operating limits for the amplifier.
More bass output puts more demand on the circuitry, and it's probably
just too much for the unit to handle safely. So rather than
potentially ruining your speakers, it's just shutting down.

William
From: Traci Steele on 10 Jun 2010 03:52
bleader wrote:
> Hi there,
>
> I've got a marrantz SR 4003 at home, which seems to go easyly into
> protection mode.
>
> First the setup:
>
> - Marrantz SR 4003
> - Jamo S606 HCS (5.0 setup), columns have passive "sub"
> - no active sub
> - optical input, raw dts soundtrack sent to the device
>
> When watching movies on this setup I found that without an active sub
> basses were a little weak, so I pushed the bass to the max (+6dB IRC).
> I was watching a movie at -30dB (not that much on a range of -81/+15),
> and at a point where there was quite some bass, the marrantz went into
> protection mode. From the documentation, there are 2 different
> protection modes, this one (8 flash per second) being the one where
> you're supposed to bring back the hardware to the store for repair.
>
> This is what I did, but curious as to know if the issue was solved, I
> tried the exact same setup when it came back from the store... and the
> same thing happened.
>
> Now it's once again back from repair, but I'm not very keen on trying
> out yet again without knowing how to reset the protection by myself.
> Warranty runs out soon, and I don't really want to bring it back to and
> wait the 3 weeks they take to send it back and forth to the proper
> repair place.
>
> So here I go with the questions:
>
> 1/ Does anyone know the get out of protection mode procedure for this
> model ? Is it some kind of switch to reset or fuse to change, or is it a
> more complex procedure ?
>
> 2/ Any idea why this happens ? My Jamo are 6ohms, but the SR4003 is
> supposed to support it (as 6ohms output power is provided in the
> specifications). I listened to music or watched movies without any
> problem prior to this, even quite loud.
>
> Any help is welcome :)
>

http://www.montrealgazette.com/news/Pedophile+traumatized+girl+mother/3134343/story.html

Before pedophile Alan Frederick James was sent to prison yesterday for
three years, the mother of one of his victims described how he'd
traumatized her little girl at daycare.

"We've had to bring her to a psychologist and doctor, and she tells her
teachers and classmates (about it) because she's worried he'll do it
again," said the mother, whose identity is protected by court order.
"She peed her pants when he walked past our house."

James, 55, was found guilty last month of sexually abusing three girls,
ages 3 to 5, at the Funtime Home Daycare in Cote des Neiges.

He molested the girls during naptime and then had them suck his thumb
while he masturbated.

"The victims were very young, vulnerable and defenceless," crown
prosecutor Anne Gauvin said during sentencing arguments yesterday.
"These parents trusted Mr. James, and so did the children and our
society, so the whole system is shaken."

Gauvin had asked for a four-year sentence, while the defence suggested
between two years and 27 months.

Quebec Court Judge Jean-Pierre Bonin ordered that James give a DNA
sample and be added to the sexual-offender registry. He's also to stay
away from parks and other places where children play.

James bought the triplex in 2004 after moving to Canada from England and
marrying a woman who established the daycare with him.

One of his young charges told her mother about the abuse and, after
going to police, the daycare, which cared for nine children -including
babies -was shut down.

The mother who testified yesterday said she is too afraid to ever again
put her daughter -now 8 -in a daycare, and finds it difficult to erase
the incidents from her mind.

"Every time my husband and I are being intimate, all I see in my mind is
what Alan James did to my child," she said.
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