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Sub goes full blown loud when plugged in to wall

Infinity bu 120, when pluged in to the electric (with no other connections made to amp etc) the sub goes full blown noise. I am afraid to connect it to system. what could be wrong?

Posted by makamakas on

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rjivaro

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  • 158 Answers

It sounds like a power supply failure. It needs to go to a repair shop.

Posted on May 05, 2009

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1 Answer

Sub making horrible noise even though its not hooked to anything
is it sitting next to any power source if so remove it away from the power source that will not make noisethe sub is just making the frequency noises from electricity

Aug 17, 2014 | Infinity BU-120 Subwoofer

1 Answer

I have a kenwood excelon xr-4s amplifier and in channel 1 and 2 i have front speakers, in 3 and 4 i have a infinity kappa doble coil 4ohm each coil. When i turn it on loud it shut down the amp and start on...
Since you have two dual 4 ohm voice coil subs, hopefully you had one sub wired in parallel to each channel separately (one sub on 3, one sub on 4). That way, each channel gets 2 ohms. If you have both subs bridged across channels 3 and 4 (left + and right -) then you have applied a 1 ohm load to your amp, which would cause the problem you're having. It's possible the amp has been damaged, but the fuses on the amp should have blown to protect the amp. Check your sub wiring to make sure you don't have a 1 ohm load bridged across channels 3 and 4. Also check the fuses on the amp itself to make sure neither of them have blown. If everything is fine there, check your fuse under the hood that's connected to your battery. That fuse could have also blown.

If you need further help, I’m available over the phone at https://www.6ya.com/expert/reginald_bec291de192ca44f

Nov 14, 2017 | Car Audio & Video

1 Answer

Loud popping sound came from my powered sub now no sound
Did you have your power on when you plugged anything in if so h could have seized your magnet for fried your voice

Aug 11, 2013 | Infinity BU-120 Subwoofer

1 Answer

My sub woofer making noise like machine gun w out connect toamp
Disconnect the sub-woofer and see if the noise stops, if so the amplifier is OSCILLATING and so produces the noise.This can be related to fault with the pre-amp or audio processing section. Try and heat up the circuit using a hair dryer and if the fault clears then there are faulty electronic capacitors. If leak is seen then the pcb must be washed after the capacitor is replaced which can solve the issue.

Mar 12, 2012 | Infinity BU-120 Subwoofer

1 Answer

My infinity BU 120 is about 12 years old. The other day, while the amp was turned off, it just started freaking out with loud popping, cracking noises. I unplugged everything which did nothing. Only...
Time for a new one.
Yours is shorted out internally, and could possibly start a fire inside itself.
God bless your efforts.

Oct 21, 2017 | Infinity BU-120 Subwoofer

1 Answer

Is it possible to hook the infinity bu-1 subwoofer to a home theater system where the subwoofer output is straight power say it"s like 25 watts coming out of that one channel and before the original...
In general higher speaker impedance is safer than lower impedance for the amp. Don't expect anything impressive re: audio output from a passive (unpowered) sub if your HTS says it pushes only 25 watts. Without frequency bandwidth and distortion noted the spec is virtually useless as a comparison.

The BU-1 is a powered sub that accepts either RCA Line Level or HIGH LEVEL amplifier power. If you use the latter, impedance is a non-issue because the input feeds the BU-1's internal amp, not the speaker directly. You should be okay.

Perhaps if we knew some specifics about the HTS we could do more than guess.

Jul 21, 2010 | Infinity BU-1 Speaker

1 Answer

What would cause the sub to blow the fuse within 2 seconds of plugging it in? (This happens with the input cable connected or not connected.)
Shorted to ground.

Apr 22, 2010 | Infinity BU-120 Subwoofer

1 Answer

My son and I both own Infinity BU-120 subwoofers, and both exhibit the same problem. Fuse is blown, and the C6 capacitor is blown apart -- literally. I was told to replace that capacitor with a 10mfd,...
Msullivan56 & son,

Yes indeed... We are on luck...

There are circuit board layout drawings...
on my Favorite FREE "manual" site ...
starting on page 20
(SHOWING POLARITY)...

Plz click here...

Infinity BU 120 Service Manual Amplifier subwoofer Bu 120 hts

Hope this helps...

My First "experience" of getting soot embedded in my SAFETY GLASSES... WAS PLACING OF A MODERATE SIZED
"POLAR" filter capacitor in a pretty large RECTIFIER PANEL...

I HAD FOLLOWED the Circuit Drawing ...
(arguably correctly)
as there was very little of it left)) when
POWER WAS RESTORED ... (sort of)

I came out of the EXPERIENCE WITH AN ENDURING
respect for SAFETY GLASSES... looking rather
like a Raccoon (I'm just saying).

Wear them...!!


Carnac the Magnificent

Jul 25, 2017 | Infinity BU-120 Subwoofer

1 Answer

Infinity BU-150 has deep hum soon as plugged in
most likely it's your signal cable. You might first try plugging the sub into the same power outlet as the preamplifier, if it is not already.

Good luck,
BB

Jan 06, 2009 | Infinity BU-150 Speaker

7 Answers

Subwoofer "thumping" w. no audio feed
You need to check your ground connection. If there is a bad ground there will be feedback to the amp and it will just sit there and loop back with the Thump, Thump, Thump sound. I had to wire my amp's ground all the way back to the negative battery terminal. It was a pain but I have never had a problem since :)

Feb 12, 2008 | JBL SCS125A System

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Sub making horrible noise even though its not hooked to anything

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