I have a NHT SA-2 amplifier hooked up to a NHT 10" subwoofer. Once the amp warms up I get loud popping noises coming from the subwoofer. Any advice is appreciated on what I need to do for trouble shooting this issue.
- If you need clarification, ask it in the comment box above.
- Better answers use proper spelling and grammar.
- Provide details, support with references or personal experience.
Tell us some more! Your answer needs to include more details to help people.You can't post answers that contain an email address.Please enter a valid email address.The email address entered is already associated to an account.Login to postPlease use English characters only.
Tip: The max point reward for answering a question is 15.
yeah ,, the circuit controllong your volume controll.. the popping sound occurs when it just shorts out and when its totally shorted the volume drops and rises..
If you got eletronic experience you can
1.) open it up
2) look for a cracked circuit or broken solder if so re solder it
3.) test the capicators and resistors and transistors for a bad one ( a tran sistor was bad in mine)
4) check the ic for it being bad or loosing connectativity or if its defective...
More than likely it will be a transistor cause if it was any other part it would have not layed at all.. the ic can also cause it..
If you have any eletricial experience or a multimeter to follow the above instructions, take it to a technician..
The amplifier would sometimes not turn on, when it did there was a loud click from one channel of the amplifier.
Inside the amplifier there is a protection board that plugs into the amplifier, the design uses 3 x 25V 47uF capacitors charged up by 22K and 220K resistors.
As the amplifier ages with time, a parasitic resistance across each capacitor gets less and less, this means that the capacitor can not charge fully up and reach thresholds, in the **** design of a delay circuit. The parasitic capacitance is affected by the room temperature making the fault intermittent.
The pop sound is caused by DC offset, it was 25mV, this was nulled using a trimmer on the amp pcb to stop the click-pop sound, this offset could of damaged a loudspeaker.
Well it sounds like your amplifier IC's are working correctly since you are hearing that pop. I have the same amplifier and every 10db increment it pops. Have you tried every input? Possibly try starting at a low volume, plug an RCA plug into CD or any other input, and touch the center prong of the other end of the cable. You should get a 60hz hum if your in the USA, otherwise it will be 50-55hz. Regardless it should make noise.
i think there may be leaky capacitor in your amplifier. there is also chance of ic failure in the amplifier it may be producing noise after getting hot. open cover & carefully see if any capacitors(which are large & round one) are burst. check for excessive heat of the amplifier ICs. replace with same type if u find any of above capacitor or ic defective.
I've never repaired one of these but I have an amp at home that makes a intermittent static "popping" noise that i'm going to put down to a dirty volume pot (control) that needs cleaning. I will also have to change some of the electro capacitors that have dried up inside which cause "shot noise". With the right lubricant (electrical contact cleaner, nothing else) you could take to lid off and spray a small 1 second blast into the hole of the pot and any other balance or tone control yourself but I would take it to the electronics repairer to get the capacitors checked over. My theory only Good Luck!
These units are capacitor coupled between stages. It sound to me like one or more of those caps are defective. There is an extra stage of amplification for the Phono inputs. Check the phono pre-amp section for defective caps.
sounds like speaker is clipping (overdriving) put a meter onthe disconnected speaker and see what the resistance is,4 ohms ,8 ohms ,if the meter wont stay in one place (numbers changing constantly) you have a burnt or damaged coil in your sub, if that is not the problem change your RCA's cables to make sure it not a bad wire including speaker wires! GOOD LUCK