Question about Coby DVD-925 System

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Output will not stay stable

The sound keeps going from normal to almost nothing, i suspect amp problem

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  • 8 Answers

Is it wireless or do you use cables to connect the speakers? If using cables, i suggest buy better quality cables. I had the same problem. Usually if the cables are old they won't hold the charge. Good luck

Posted on Jan 28, 2009

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Posted on Jan 02, 2017

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My zx850.4 keeps jumping to protect i have cvr10" 2 ohm wired as vc series/ to pallel subs and it keeps jumping to protect its 2 ohm stable i can hook subs to my 300.4 that alreadyruns 4 speakers and it...


Be aware your amp can deliver more power to a 2 Ohm speaker, but will not work if the 2 Ohm speaker somewhere in the audio spectrum comes beneath the 2 Ohm. Because you want the sub, to go as low as possible, it could be the speaker will have a very low impedance under 20 Hz, causing your amp to go in protection.
The power you give to the amp, will not be the cause it going in protection. It is sensing the output current, so it will stay in the borders the end stage can deliver. Try two speakers in series and give the same power. If the amp is not driven into the protection, I think you are closing in to what is causing the problem.

Jul 06, 2014 | Car Audio & Video

2 Answers

I have 2 amps one for mids and highs and other for subs the one for subs is a zx859.4 and 2 ohm stable i have 2 dvc 2 ohm cvr 10s i have them wired up as parallel and they are bidged in the 850.4 and it...


Logan, You must be very desperate, to put the same question her for the tenth time. Yes you keep using different words, but it all comes down to the same. I already gave an answer yo one of the questions. I think you should read that. It has not much to do with the power cabling. It has to do with what you are putting on the output.

Jul 06, 2014 | Car Audio & Video

1 Answer

What would be the best size amp to purchase for two audiobahn aw1200 subwoofers and two pioneer 4-way 6"x9"?


First, I would purchase the amp based on the subwoofers alone. Allow unit power to run the 6x9's unless you are planning a intricate setup. Things to think about when buying your amplifier. Always get an amp that offers an RMS output of 25-30% greater than the combined RMS output of your subs. Also, the stability of the amp to handle ohms loads (1, 2, or 4 ohm stable). If you have two dual 4 ohm subs you can get a 2 channel 2 ohms stable amp, or a monoblock 1 ohm stable amp. This will get you the most power and sound for your buck. There are so many amplifiers out there at different price levels, it's really up to you. Hope this helps.

Sep 03, 2011 | AudioBahn AW1200 Car Subwoofer

1 Answer

NO SOUND


Blown soeaker or amp. Only way to analyze is to open it aand do testing. First plug headphones into the 1/4 inch line output jack and see if anything comes through... it will only be in one ear as the ouptu is not a stereo output... If it comes to there, then the preamp and line driver is working, leaving the speaker and power amp suspect. If nothing ocmes out, I suspect the power SUPPLY might have failed.

May 10, 2011 | Ampeg BA600-210 Bass Combo (with )

1 Answer

JBL Amp P80.2 - Random output failure


i had an amp that did that for a while before frying. its possible that it could be overheating causing it to go into protection mode which can be fixed with a cooling fan or remounting it somewhere else so it can get some air. it needs to be mounted in a way that it will have at least 1/2" clearance under it so it can have plenty of airflow. the other thing is you may be putting too much of a load on the amp causing it to go to protection mode. check and see how u have the sub wired and if the amp is stable. if u have the sub wired at 2ohm for more power output and the amp is only stable at 4ohm, then the amp will overload and cause the problem your experiencing. thats what happened to my amp. i had it wired for more than it was stable for and it fried

Jun 04, 2009 | JBL P80.2 Car Audio Amplifier

3 Answers

I cannot find the specs or user manual on the JVC archived items list. A few sites want to charge $10.00 for the user guide info, but I think that is too much to charge.


Defiantely not 200 watts
KS-A82
  • 2 Channel Amplifier
  • Bridgeable 2 channel amplifier
  • Output power: 25W x 2, 20 - 40,000 hz at .08 THD
  • 2 ohm stable
  • Adjustable gain (.1 - 2v)
  • MOS-FET DC-DC converter
  • Multi phase connection
  • 1 Pair of line input terminals
  • Remote relay turn on system
  • MSRP: $159.95
http://www.admtechusa.com/JVC.html#KS-A82

May 22, 2009 | Car Audio & Video

1 Answer

I recently installed a amp to my sound system I have a pioneer deck when hooking it up everything works but when I turn it off the car theamp light stays on I check everything I think it is my remote wire.


You are correct!

If you have a volt meter or a test light you can use it to see if you have some voltage on the remote terminal on the amp.

If you do not have either of those items, just disconnect the remote wire and see if the light goes out.

If the light goes out, you have voltage coming from your radio that is keeping the amp turned on, that is normally a problem with the radio. The remote output of the radio may have a shorted transistor in the circuit.

If the light stays on, you have a problem with the amp. It is rare to have an internal electrical problem with an amplifier and the amp still works normal. That is not to say it can not happen, there may be a component that is shorted in the turn-on circuit of the amp that is isolated to the turn on cicuit only, and it keeps the amp on all the time.

This will become a big problem soon if not repaired. If the amp is staying turned on even when the car is off you will drain your car battery rather quickly. Most amplifiers will draw between 1 amp and 2 amps of current with no signal applied, this is called the idle current.

Find out which unit is causing your problem and take it to be repaired, it is most likely an electrical problem that will need good electrical troubleshooting skills to locate.

If you need any more help with this feel free to ask, with the model number of the unit at fault I can even find you some likely suspects to be checked.

Don't forget to give me a "FixYa" if this information turns out to be helpful.

Jun 19, 2008 | Car Audio & Video

1 Answer

Power cuts off


This is not a fuse problem. I would suspect that the output amplifier section is getting too hot and shutting down. Check you speaker cables and make sure that they are not shorting out at all. If they are OK, then there is a problem with the amp itself that will require bench time to resolve.
Keep us posted.
Dan

May 28, 2008 | JVC MX-D302T Shelf System

1 Answer

Technics SU-V2 keeps cutting out


An amp will cut out if the output protection circuit kicks in. This circuit compares output power against the preset level. Each channel has it's own, independent protector. There are calculations that can be done, but for a novice the rule of thumb is to "never use a speaker with a power rating less than the amp AND a lower impedance than stated". Typically using a 4 ohm load on a 8 ohm system is inviting disaster. Even if the system does not become a smoke generator, you might notice that though "louder", the sound quality is deteriorated. Many "audiophiles" often hook up some combinations of speakers to have "surround" without really understanding that the collective impedance actually changes (generally lowers).

Jan 21, 2008 | Audio Players & Recorders

1 Answer

Stop putting out sound to subs


Ok This is a two channel High Current amp. It is stable to one ohm. If the Subs are single voice coil at two ohms the they have to be wired in Parallel that means (Red +) (Black -) are connected to the + and - of another sub and then the (RED +) (Black -) from both go to one output channel of the amp. You pair the other two in the same fashion on the other output channel. If you are getting no output (sound) at all first check if the amplifier is going into protect. (Usually indicated by a red led on the unit. If it is connect only one Sub to each output and see if the protect LED goes out. If it does then you should have sound at the subs. If not check that you have the sub output enabled on the HU some head units do not come with the sub output enabled on the HU. If every thig is enabled, with only one sub connected to each output and the protect LED is not on then your amp is probably blown and needs repair. Nice thing is that MA has a great warrenty policy. Check and make sure the protect LED is off. If it is on you probably have the SUBS wired wrong

Jun 23, 2007 | MA Audio HK802SX Car Audio Amplifier

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