[Sha09mel]

I have an mosconi gladen 240.2 powering my morel dotech ovation 6 components for past 1 year and was running perfectly. Until few weeks when the volume is turned up on the receiver, it cuts out completely for a split second at a time but repeatedly. There are no scratching noise just the loss of signal.
I've ruled out the power cable the ground wire, speaker wires, RCA from the head unit by powering my focal FPS 2300.2 and the components work flawlessly, no loss of signal even at higher volumes with gains on 40%.
Initially the gains on mosconi was at 40% and I could listen to music at 50 vol. Now with the same gains the sound cuts at 30-35 vol. The LED's are still lit while it cut's out.
Also, while DIY'ing last night I noticed the loss of signal while playing some bass tracks, so EQ-flat, bass boost-off, loudness-off, harmonizer-off, and I can listen to music at 50 vol with 40% gains. But, the minute I increase the vol above 50 and the signal cuts off. Is it a problem with the amp?
If anyone has any idea's, I'd really appreciate the help!

Thanks!

BTW, head unit is eclipse cd7200 mkII and focal fps 2300.2 is powering the focal 33v2 DVC.

[navin]

The amp needs to be checked. The Mosconi is not something you can diagnose without the help of the dealer and/or schematic.

[Sha09mel]

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[DerAlte]

email / call them - I think they will surely oblige. Contact details must be there on their website. BBW must be having a local service agency in Mumbai.

IMHO it just needs servicing (cleaning) - the amp must be cutting out for short durations due to overheating, or there is an intermittent open on the board. You haven't written if this cutting out happens at all at low volume. Gain setting doesn't matter - that is to match the HU's output to the Amp's input.

[Sha09mel]

Originally Posted by DerAlte

email / call them - I think they will surely oblige. Contact details must be there on their website. BBW must be having a local service agency in Mumbai.

IMHO it just needs servicing (cleaning) - the amp must be cutting out for short durations due to overheating, or there is an intermittent open on the board. You haven't written if this cutting out happens at all at low volume. Gain setting doesn't matter - that is to match the HU's output to the Amp's input.

So BBW I need to contact.

I doubt overheating cause when I ON the system in the morning to drive for work it plays well at low volume, but the minute i increase the volume it cuts out.

[DerAlte]

Originally Posted by Sha09mel

... I doubt overheating cause when I ON the system in the morning to drive for work it plays well at low volume, but the minute i increase the volume it cuts out.

As soon as you increase the volume, the power output stage is putting out more power. More power means more losses, and losses turn out as heat. That heat heats up the power output amplifier circuit / chip. Some amps have a temperature monitoring for the power output stage, which throttles the output if the temperature crosses the threshold. In your case, either the temperature sensing is kaput, or the power output stage is unusually heating up at fairly low volumes.

As I said earlier, it could also be a pesky intermittent open circuit due to a bad solder joint, aggravated by heat.

[rohan.xj]

You can get the amp checked through a reputed agent also!

I have been using the services of Auto King (Shivaji Park) for the past 6 years and have never faced any problems in getting my car audio systems repaired/serviced. Do let me know if you need their contact details.

[Sha09mel]

Originally Posted by DerAlte

In your case, either the temperature sensing is kaput, or the power output stage is unusually heating up at fairly low volumes.

Just hope this is not an gradual failure. Seems the amp needs some maintenance.

Originally Posted by rohan.xj

You can get the amp checked through a reputed agent also!

I have been using the services of Auto King (Shivaji Park) for the past 6 years and have never faced any problems in getting my car audio systems repaired/serviced. Do let me know if you need their contact details.

I would be looking to send it the dealer in Delhi just to be on the safe side. Thanks anyways rohan!

[DerAlte]

Originally Posted by Sha09mel

Just hope this is not an gradual failure. ...

Nah, semiconductors are robust - unlike vacuum tubes of yore. In vacuum tubes, like in headlamps, there is a gradual migration of metal molecules as the filament is at a high temperature.

Other than that, it is only remnant flux, leftover from the soldering process, that can cause a component contact / PCB joint or track to fail after sometime.

[Sha09mel]

Originally Posted by DerAlte

Nah, semiconductors are robust - unlike vacuum tubes of yore. In vacuum tubes, like in headlamps, there is a gradual migration of metal molecules as the filament is at a high temperature.

Other than that, it is only remnant flux, leftover from the soldering process, that can cause a component contact / PCB joint or track to fail after sometime.

Spoke to BBW and have been asked to send the amp to Delhi. Thank you DerAlte sir and other's for your time to reply. Shall keep you all posted on the feedback that I get from the dealer.

[funkydude]

I am facing the same problem on my XUV W8. Components and sub is cut off if volume is increased.

My Setup:
- 4 channel Auditor AMP
- Focal components
- Focal coaxial mid door speakers
- Soundstream subwoofer
- JBL HiLo converter

Please suggest as I have tried all alternatives.

Reducing the gain help increase the volume to 1 or 2 level max.

[DerAlte]

Originally Posted by funkydude

I am facing the same problem on my XUV W8. Components and sub is cut off if volume is increased. ...

Could you please describe a bit more under what circumstances does this happen? How often? Does the sound come back by itself after some time?

Prima facie, this sounds like your amp is cutting out due to heating.

Originally Posted by funkydude

... I have tried all alternatives. ...

What alternatives have you tried?

Being able to go slightly longer before cutting out by reducing gain - this is again a pointer to your amp is heating up.

[Metallicar]

I had almost similar problem. I have a HU of Pioneer with 2 front comps of pioneer. 2 ovals of Rockford, Rockford Sub and Rockford amplifier combined with some local Chinese made Hamaan amplifier.

Initially the problem was that on high volumes the woofer will stop working and the speakers used to run smoothly. Then later on problem changed a bit and now the woofer was working but the speakers were not. This used to happen randomly and switching the system on/off had no effect. Sometimes it will happen for hours at a stretch but sometimes just for a second.

Then I installed Rainbow SL series comps in front door. Pioneer comps shifted to back and ovals removed along with the Chinese amp which was replaced by a rainbow beat 4 amp. Wiring etc was checked and there was no trouble. After installation the system was working so the technician didn't bother to check the real problem and was convinced of some issue with the Chinese amp.

But the it started again. Then my car met with an accident and was in garage for a week where some guy changed the fuse of the Rockford amp and now I haven't noticed any more issues in past 10 days.

So you guys can try the same I think.