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.

[PDF]The Bose® Lifestyle® SA-2 and SA-3 Stereo Amplifier

https://worldwide.bose.com/.../en/owg_en_sa2_sa3.PDF Bose CorporationWARNING: To reduce the risk of fire or electrical shock, do not expose the product to.... ence to radio communications. ... Note: Unauthorized modification of the receiver or radio remote control .... Thank you for purchasing a Lifestyle® SA-2 or SA-3 stereoamplifier. ... Left and right channel line inputs for a local audio device.

[PDF]Owner's guide - Bose

worldwide.bose.com/axa/assets/pdf/owner.../og_sa1.pdf

Bose CorporationJan 4, 2002 - WARNING: To reduce the risk of fire or electric shock, do not expose the.... may cause harmful interference to radio communications. ... Connecting theLifestyle® stereo amplifier to a Model 5 music center . ..... Lifestyle® SA-1 stereoamplifier rear panel ... Setting up the RC-20 remote control for Zone 2.

[PDF]BOSE® Link AL8

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.

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.

Have you checked the heater plugs? if one is out it will be hard to start. Does it run sweet and clean when warmed up?

http://www.retrevo.com/support/Sony-SA-WM500-Subwoofers-manual/id/752ag404/t/2/


The fuse blowing is a symptom of something seriously shorted internally. What preceded the initial problem? Smoke is bad. Fire would be soon to follow without the fuse blowing. Take it to a tech.

Hi,
Replace amplifier output big IC that seems defective and not giving sound to speaker.
Thanks.

That message means the audio amplifier IC´s are damaged

Jeremy,

Read one of my posts:
I used a hairdryer and blew hot air into the grill on the bottom of the subwoofer enclosure which reduced the delay time from ~1hr to 5 minutes. (The high pitched noise was still there for about 1-2 minutes)

This subwoofer has (2) 2 Ohm voicecoils.
Which means you will only be able to wire a 1 Ohm or 4 Ohm configuration for your amplifier.
The Model # you listed for the amplifier is not a valid one.

If your amplifier is 1 Ohm mono stable...
you wire both (+) Sub to amp (+)
and both (-) on Sub to amp (-)
This is PARALLEL wiring and lets the amplifier SEE a one ohm load

If your amplifier is NOT one ohm mono capable - your only other possibility is a 4 Ohm load.

Wire from (+) on amplifier to one (+) on the sub
Then Wire from (-) on amplifier to the OTHER terminal's (-)
You will have one (+) and one (-) left on the subwoofer - wire them together.

This is SERIES wiring, and nets a 4 ohm load for your amplifier.

There is no other configuration for wiring one Dual 2 ohm sub.

Thanks for using FixYa - a Very Helpful Rating is appreciated for answering your FREE question.

Although open shields on the head unit generally cause MTX amps to squeal, it can sometimes cause the symptoms you described. To check the shields, you will need a multimeter. The procedure is on the following page:

Testing for Open Shields on RCA Signal Cables

If the shileds are OK, we will have to check a few other things.