Question about NAD C320 2-Channel Amplifier

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Volume level switch for automotive audio amplifier

Is there a product that will apply power to my car amplifier only when music is actually playing? The amp(s) have a sense circuit that let them operate on/off when the radio is on/off, however, I'm using a car computer that has no such output circuit. I'd like to put the sound card signal into a box inline with the amplifier and have that box control the amplifiers turning on when the volume level reaches a certain level and then stay on for a predefined delay period.

The reason for this is that the computer has no output like a car radio to turn on an amplifier so I wire the amp radio sense to accessory and amps come on with ignition switch. The computer always puts out some low level noise, be it white noise or processor RF, especially before the sound card is initialized while booting. The amps being on all the time with the ignition switch makes it annoying.

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5 Suggested Answers

  • 2 Answers

SOURCE: nad 302 amplifier

sounds to me that the vol control has lost its earth end connection So yes its a problem with the dial control You couls try some contact cleaner But better still lift of the lid and base if possible while the amplifier is not plugged into the power socket and see if you have a dry joints around the vol control pot regards Trev

Posted on Mar 14, 2007

snakehead
  • 1074 Answers

SOURCE: Amplifier cutting out when volume is increased

yea my friend your audio ic or transistor is either getting faulty or you have lose connection have a tech look at your set and make the nessecary repairs.good luck

Posted on Apr 26, 2007

robotek
  • 1512 Answers

SOURCE: nad s200

It is most probably a dirty speaker protection relay. gently tap the relay(the one that engages shortly after turning the amp on) when the fault is occurring and see audio returns. This should ascertain the problem. Replace it if it is a sealed type, or if it has a "lid" you can get off, burnish the contacts with a white business card, and give it a spray with contact cleaner/lubricant. Good luck and a "fixYa" rating would be great for my profile :)

Posted on Feb 06, 2008

marsrover
  • 682 Answers

SOURCE: nad 310 amplifier VERY QUIET

take audio out from tv and insert it in aux in in your amp.

Posted on Jul 15, 2008

alexhor
  • 28 Answers

SOURCE: excess clipping on nad 372 amp

Check the input from the pre-amp stage it probably has a high input gain that supposedly in only range of a millivolts 1/100ths of a volt usually 50 to 100mV, i.e. to avoid clipping of sound waves at the power amp. you have to minimize the output voltage coming from the audio/sound devices from its equalizer settings, or maybe either pre-amp stage I.C. has a leaky capacitor, or power amp stage is also defective. hope this help good day ;-)

Posted on May 24, 2009

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Why is the volume on my JVC KD-SR80BT limited to 30?


The number on the panel of your car stereo is not a measure of actual volume. It is just a comparative scale, with 0 being the minimum and 30 being the maximum. The volume as measured in decibels is dependent on the power level of the amplifier and impedance of the speakers. The internal amplifier puts out 22 watts per channel (50 watts peak) into 4 channels, and there are output jacks for an external amplifier(s). Product specs in link.
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JL Amplifier 500 1 shuts off after i put the music up a bit. at low volume levels it's ok. But when i put the volume up it will turn off. Have had the same setup and setting on the amplifier for 1yr. just...


Check the wires going to the amp for any corrosion on the terminals and ground.

. Kind of like when someone squeezes a garden hose2_bing.gif when your trying to use it. That would be the high volume, starving the amplifier. The capacitor stores power in it to power the amp at high volume. 2 farads would probably be bulletproof on a single amplifier system, but 1 farad should work well enough. Or seek help from an expert on exactly what size capacitor you should use. If you find yourself saying: My amp cuts out.

If this assisted in solving your problem, please take the time to rate it. Thank you.

Mar 03, 2010 | Jl Audio 500/1 Car Audio Amplifier

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Car amplifire when conected to nokia mobile music player and when sound level increases of the mobile device the output sound cuts and plys also plys very low sound


Mobile r not good for playing music in a heavy system because Mobile has not a good sound quality as iPOD and others players have, also all mobile has not a capacity to play with amplifier, and the sound output of your mobile is low there fore u r getting low sound. If your amplifier has its own volume control then u can increase it from there. It is best to use iPOD. Thanks 

Nov 25, 2009 | Sony XM-222 Car Audio Amplifier

1 Answer

BOSTON ACOUSTICS BA735 volume is LOWER than MAXIMUM LEVEL


OK, a few things here. First of all, what program are you using to listen to music? Some programs have an automatic volume leveling setting. If you're using Windows Media Player, it has one. Next, you should NEVER set any speaker/volume/amplifier knob to Maximum setting if you want to get any life out of your speakers. Speaker ratings are for consistent volume levels at a "clean" power level. When you turn any music source up past 80% you are pushing more distortion through the speakers that they cannot reproduce without self destructing. The human ear cannot hear this, and the volume gain is minimal. Next we'll talk about that your dealing with a combination of power levels compiling into an amplifier that may be taking in more than it can aptly amplify according to it's power multiplier scheme to increase the volume at the speaker level. If you've got everything maxed out, you're probably just pushing it all WAY too hard. All over exerted energy that is not being used productively will end up in generating heat and distortion. Those are your 2 biggest enemies when it comes to anything audio. Distortion tears voice coils and generates disruptive electrical currents, and heat destroys circuitry and components in amplifiers. The times where they jump up in volume, just look at that as borrowed time until they blow. If you want louder, get a better or more powerfully rated set, and still, NEVER turn it up past 80% if you want it to last.

Jun 09, 2009 | Boston Acoustics BA735 Computer Speakers

1 Answer

I HAVE A JL AUDIO MONOBLOCK AMP 250


It indicating that the power output is too loud and possibility of speakers may get damaged if played at this volume for long periods. When the loudest sound is played the led light mightshow its loosing its brightness and dims in time with the sound level.......................sodeep

Jan 17, 2009 | Jl Audio 500/1 Car Audio Amplifier

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

Sony XM-2002GTR Car Audio Amplifier


I don't think it is a problem. Your amp probably has a power-saving mode being activated at low volume levels. Actually I don't know exactly what your amp is, but this is just a guess, and it could be a plausible one as long as you can get sound without using the amp. If it is so, it must have a function to deactivate the power-saving mode.

Apr 19, 2007 | Sony XM-2002GTR Car Audio Amplifier

1 Answer

Comdial impact 8024s LCD Speakerphone


This is an option of the phone system and not the phone. There should be a music port on the side of your phone system. You want a low volume level input to go into the port (an amplified signal can apply too much power and break the feature)

Jan 02, 2007 | Comdial Impact 8024S-PT Corded Phone

1 Answer

Playing my music, then amp goes out? anyway to fix it?


Looks to me like u are having a power problem. Check if power is going to your amp, if yes, check the fuse on the amp. If ok, check the powersupply section for any damage components and replace.

Dec 18, 2006 | Sony XM-2200GTX Car Audio Amplifier

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