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NHT SubOne makes hum when the standby mode is activating and when playing music there are pops when the volume gets loud.


Hums are generally caused by electrolytic capacitors that have gone. You should replace any large ones in the power supply section of the unit.

May 28, 2017 | The Audio Players & Recorders

1 Answer

NHT sa-2 amplifier won't go into standby mode after 10 Minutes of no signal


Does the NHT sa-2 have it's own pre-amp? Because I'm wondering if the power off only works when it's own pre-amp is used? So when your receiver is connected it's shut off.

You could try something connected to it's own pre-amp (if it has one) and see if it goes off when there's no signal from that.

Jan 30, 2015 | Audio Players & Recorders

1 Answer

Wine noise only, no volume control


C7 and C15 capacitors bad, on main amp board, 470uf/25vdc, in +13vdc power supply circuit. BE SURE TO DISCHARGE MAIN LARGE CAPACITORS ON POWER SUPPLY BOARD AS THEY RUN AT + AND - 90VDC (180VDC TOTAL) AND STAY CHARGED LONG AFTER UNIT IS UNPLUGED!!! Shock hazard and may damage unit beyond repair if not discharged while desoldering components. Use around a 1000 ohm, 5 watt resistor across capacitor leads, if possible check voltage with meter to be sure they are discharged.

Feb 16, 2014 | NHT Subone 250 Watt, 10 Subwoofer Single...

1 Answer

My Harmon Kardon AVR 2600 goes to protect mode when powered up. After many tries it will fire up but at times it's up to twenty times. I did load the software upgrade 6 months and it has been fine


Check all speaker wiring for shorts, if okay! there is a problem in the audio output stage of the unit or the protection circuit is not working properly. I would suggest a pro to evaluate.

Apr 02, 2012 | Harman Kardon AVR 2600

1 Answer

Bosche cooktop nht 725 a uc 1999 need conversion kit to go from natural gas to propane, hate to toss a good stove top need model kit order numbers


I spoke with Bosch customer service who said there is no natural to LP gas conversion kit available for the NHT 725.

Oct 05, 2010 | Bosch 30 in.NGP746UC / NGP742UC Gas...

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Subwoofer hum from STR-DH800


That points pretty much to a bad shield on the cable. Have you tried another one? Another thing to try is to rotate the AC power cord on the sub (if it has one). Sorry, too lazy to look it up.

Dec 29, 2009 | Sony STR-DH800

1 Answer

NHT SA-3


Appreciate the direct "Ask Me". With reference to your post here;

Voltage checks are done with the power on whereas resistance/continuity check are performed with the power off and preferably the component out of circuit. The VOM would do.

You posted that the fuses have not blown and therefore you are assuming that the output transistors are not defective. Pls confirm this by performing a check on the base to collector to emitter of the output transistors. This page would illustrate how to check a transistor using a VOM. The output transistor once removed from the circuit (pls mark which goes to where), laying flat with the pins/feet pointing towards you would be base, collector and emitter. Although the real outputs if 2SA1302/2SC3281 would be larger.
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Most NHT sub amps are standard design amplifiers. To my knowledge, NHT amps (but not all) uses a unique design to supply power to the output transistors. The fuses does not tie directly to the output transistors from the +/- of the power supply. Instead the fuse goes to several power MOSFETS (IRF640) that regulate/control/monitor the current/voltage supplied to the output transistors. If any of the IRF640 is blown, the output would have no voltage even if the fuses are good.

To be more specific and to confirm the above, would appreciate if you could post/share the schematic diagram.

May I also inform you that there are posts made by other members of the community (our co-experts, I am aware that you have provided solutions yourself in some other posts) that would be of additional help. ginko has posted the method/manner by which you could test the transistors and other components, while bunnydawg addressed the fuse not blowing. welcomejee has posted with an amp schematics of an NHT Subtwoi.There were however and I would expect more posts that are too general/generic to be of any real use to you. I would leave it to your discretion to filter through the flood of information.

As a site policy, once you rejected a solution or give it a "Thanks for Trying", that particular post/expert would no longer be viewable. For your benefit, may I suggest that you copy and paste the "workable solutions" to a document that you would have a record of previous or no longer viewable postings.


Jan 04, 2009 | Audio Players & Recorders

1 Answer

I have a NHT SA-2 Amplifier 1996 model year. Once unit warms up I get load poping noises from the subwoofer. Please advise what may be causing this to happen.


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

Dec 15, 2008 | Now Hear This SA-2 Amplifier

1 Answer

Technics sax-710 receiver Nht sb-1 speaker developed a buzzing sound when playing, Kids may have over drove speakers(not sure) Replaced with nht supezeros now both speakers sound very staticy like off...


The speakers have buzzing sound because of damaged cones.
Over driving speakers, especially with heavy low frequencies, can tear the voice coil away from the cone.
Once damaged, only replacement will help

Apr 24, 2008 | Audio Players & Recorders

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