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Amplifier auto off when too loud - Sherwood Audio Players & Recorders

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Check your speakers. If a speaker is going bad or is being over-driven the amp will shut down to protect itself

Posted on Nov 20, 2013

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6ya6ya
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Posted on Jan 02, 2017

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Subwoofer makes loud hum noise


4 possibilities:
1) ground loop or open connection on input.
2) close proximity to a CFL, or other flourescent fixture.
3) bad filter caps in the sub.
4) bad coax to the sub.

in any event, check wire routing. You can also track down the noise sources by using a portable AM radio tuned off station. it will pick all manner of RF noise around the house. Light dimmers are notorius noise makers.

Dec 20, 2011 | Audio Players & Recorders

1 Answer

My speakers are not working. They turn off and on and sometimes make a loud hissing sound. What should I do?


Hello Miranda, Hi, looks like its an amplifier problem, you see the hissing loud sound means that the amplifier section is bad. the amplifier is usually an integrated circuit, this needs replacement, the job can be done by a desoldering the part and replace by another IC. Have this checked by a technician.

Feb 15, 2011 | Car Audio & Video

1 Answer

Constant buzzing in my 15 W amplifier


Make sure you have a ground prong on your power cord. Most input jacks nowadays are closed circuit. They have a switch built in that won't allow any sound without the cord plugged in. You may have a damaged jack that will give you a loud hiss, a loud hum or crackling depending on what volume your controls are set at.

Aug 27, 2009 | Line 6 Spider Iii 15 Modeling Guitar...

1 Answer

Pioneer car audio amp GM 6300F (new)


Does your amplifier have a Channel swith which says 2/3/4 channel mode. If so and you are running the amplifier in Bridged mode, try changing the setting to 2 channel or Bridged mode.

Aug 20, 2009 | Pioneer GM-6300F Car Audio Amplifier

1 Answer

Need user manual for setup of the amplifier.


It should say next to the speaker terminals what impedance of speaker the amplifier is rated for. You can drive any speaker within reason with just about any amplifier as long as you are not trying to attain loud levels. Here is a link to the service manual for your amplfier. It states in the schematic power ratings for 2,4, and 8 ohm speakers so you can assume that this amplifier is compatible with those impedance speakers. NAD is generally known for their beefy amplifier sections. http://www.scribd.com/doc/7234868/NAD-3020-Service-Manual

May 03, 2009 | NAD C325BEE Amplifier

1 Answer

Behringer EP2500 amplifier channel crackling noise


Got asilimar problemwit a behringer europower pmh 3000.
my

The Right channel began to crack up and drizzle now it seems completely dead.
Changed the cables both of input and seapkers , still the problem stays the same. Any suggestion before brigning for a month at the repair shop? And get out with a 200-400$ bill ?

Apr 28, 2009 | Behringer EUROPOWER EP2500 Amplifier

1 Answer

15 inch velodyne subwoofer making a loud popping sound


If you have changed the signal source, then these may not be the problem at all, it may be that you have the sub output set to low on your processor.


This may be one of these problems.

It could be the "auto on" circuit.
If you change the switch on the back of the unit to always on does it still do this? if not then it is the auto on circuit that is the problem.

The driver mounted servo unit is starting to fail.

A cap in the amplifier input section may be going bad.

You nwill need to contact Velodyne for repair of the unit.

Feb 20, 2009 | Velodyne HGS-15 Subwoofer

1 Answer

Which is a better tuning setup for good quality bass ?


The KAC-8401 has a bass boost switch. Be sure that is on +6dB setting.
Secondly, LPF (low pass filter) should be selected, with the crossover cutoff set to 60Hz.


Follow the instructions on this site for accurate tuning....
http://trussinme.com/Apps/audio/voltagecalc/default.asp



Manual For Download:
http://inform3.kenwoodusa.com/manuals/KAC8401.pdf

There is so much bad information and VOODOO going around the internet about how to set car audio amplifier gain controls that I thought I better write this. Gain controls on an amplifier are basically just small potentiometers (variable resistors) or volume controls if you will, that allow you to adjust the incoming signal to the amplifier so the amplifier works well with your headunit of choice or to match the level of other amplifiers in your system.
Its not rocket science to set the gains. Gains are like little volume controls, (I don't know why so many installers are taught that gains are NOT volume controls, when in fact that is EXACTLY what they are!) its super simple to just set them where the level sounds good to you.
With one amplifier its desirable to have a nice swing on your headunits volume control. Let me try to clarify this a little.
If we hook up a head unit with a 8volt (or more) output to an amplifier, then the volume will get loud very fast when we start to turn it up...In other words if our digital volume control goes from 1-30, then a HIGH VOLT output to an amplifier might make the amplifier reach full power at 5 on the volume scale... That kinda sucks cause it would be nice if you had a little more swing in your 1-30 range!
And by the same token a headunit with a LOW VOLT output might have to be turned up all the way to 30 and might still not quite drive the amplifier to full power... That sucks too!
A gain control in this case will allow you to adjust the amplifier so it allows the volume of a headunit to control the amplifier so it will get loud at a desirable point in the 1-30 swing... Usually about 3/4 the way up. We don't want it to get loud too fast as we wont have a good control as music levels differ. And we don't want it to have to be turned up all the way to get loud either, because since different music may be recorded at different levels if we set the gains for max output with one music source it might not get loud with a music source recorded at a lesser level.
So, by setting the gains so 3/4 turn of the headunits volume knob gets it LOUD gives you plenty of control and some extra above the 3/4 mark in case you get some music that's recorded at a lesser level...
To do this its easiest to do it by ear. No need to drag out the TEST TONES and OSCILLOSCOPES! They will do you absolutely no good.
One MYTH is how the gain controls will help to prevent amplifier distortion and amplifier clipping... That's simply not true, UNLESS you set the gains at a level where the headunit cannot possibly drive the amplifier to full power.. And even if you were to find this magic spot for your gain controls then (A) you would have to turn that volume control FULL SWING to get your system loud and (B) since many music sources (or disks) are not all recorded at the same level, its likely that if you have a disk recorded lower then you cant get it loud at all! and if you have a disk recorded louder then you can still surpass your magic spot... So in reality searching for this magic spot is fruitless! Dont waste your time...
In the early 80s when high fidelity car amplifiers were just starting to make the scene I worked with a pretty crazy installer that was kind of legendary around these parts... I wont mention his name but he was pretty highly respected at the time.. Well anyway, this crazy installer had heard that the amplifier gain control was to prevent amplifier clipping.. (still widely heard today).. Well this crazy installer set up EVERY CAR WE DID to the point where the gain control was so LOW that if you turned the head unit all the way up the amplifier WOULD NOT DISTORT.. And of course if you did turn the headunit all the way up the system would just be getting loud...
Customers would find that some cassettes would be recorded at a lower level and the music just wouldn't get loud enough... The Crazy installer would FLIP OUT and tell the customer that a REAL AUDIOPHILE doesn't want his music to distort or be that loud! The customers were NOT HAPPY and came to me to say "Gee Eddie, I don't want to make the other guy mad but can you adjust my system so it sounds good and please dont tell the other guy? Of course I said yes, and some of those customers from back in the early 80s are still my customers and they are sending sending their children to me for work as well.
SO, you see the only way the gains can be used to eliminate clipping or distortion will also limit your top end volume! And for most of us it is NOT DESIRABLE to do so.
As long as this is not done, it is just as possible to turn your system up to FULL power and beyond to clipping no matter where the gains are set....

Jan 01, 2009 | Kenwood KAC-8401 Car Audio Amplifier

1 Answer

Xm 1002 hx


1. What type of head unit are you using
2. does the head unit have a Loud feature?
- Sometimes you have to press the loud button on certain head units to engage the amplifier.


Try disconnecting your remote wire from the amplifier, grabbing a piece of small 12 or 16 gauge wire and bridging the remote wire with the (+) on the amplifier. if your light does not turn green, then check your fuse and the ground for the amplifier itself and the subwoofers.

When you connect the remote wire to the (+) it should automatically turn the amplifier on even if the cd player isnt on. The reason I want you to try to connect the remote and power is because sometimes the remote wire for the cd player is bad. If it does end up being a bad remote wire from the head unit, then your best fix would be to connect the red wire (ignition 12v) on your head unit to an on/off switch to the remote on your amplifier. You can then turn your amplifier on and off by flipping the switch. If you go to autozone or advanced auto parts you can pick up a toggle switch for about $3.00.

Feb 20, 2008 | Sony Xplod XM-1652Z Car Audio Amplifier

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