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Jbl sub 135 motorboating b4 warm up JBL sub135 I never heard it called motorboating, but that is a good description of the sound, It's like the sub is trying to output sounds which are not in its range like female newscasters, a conisitant bu-bu bububu-bu -bubu. I do not notice it after it has been on for an hour or so. I got a great deal on this sub at a pawn shop, the sound is great except for this problem.

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  • PDnAZ Mar 04, 2009

    I returned the JBL and purchased a Polk. Got home Hooked it up, found it was doing the same thing! Ok, sub was not the problem. It's hooked up to a Visio 55 LCD which has a sound setting called SRS TSHD. I turned it off and the problem was solved.

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Turning the unit on without any input signal, the speaker did the pop and scratching sound. I found on the limiter board ( small pc board on the main input pc board) that there is a wire jumper on the back side of that had a cold solder joint. You will have to clean up the glue that was used to hold the wire on the back side of the board. I just replaced the wire with new one.

Look at the +15vdc off of Q117, I moved it to the left side of the pc board and added a heat sink to the unit. The 1 watt resistor created some cold solder joints that you will have to check.

hope this helps

Posted on Jul 18, 2009

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As Bob has suggested, remove the brown glue on the limiter sub board on the input board, it becomes conductive as it ages. This turns the limiter board into a slow oscillator, causing the loud thumps.
Check for dry joints on transistors Q105 and Q106, on the amplifier board, Also replace the 220 uF 10 Volt capacitor, C130, next to Q106. Q106 gets hot which damages that cap.
(In the sub I was repairing, this cap was only 30uF!!)

Mark

Posted on Sep 09, 2010

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Sounds like a possible ground loop problem. Are there anyother cables running on top or along side the sub cable? Also, make sure there is no other remotes or electronics on top of the sub itself.

Posted on Mar 04, 2009

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Posted on Jan 02, 2017

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Want to use my current speakers with a new surround sound system. Current system is 5.1 channels, rated at 100w per channel @ 8. Ohms. New System is rated 145watts, 5.2 channels at 6 Ohms. Will b ok?


Hi Ronald.
8 Ohm speakers will work just fine as replacements for the
6 ohm speakers. When fitting speakers you need to consider
The power handling capability. The impedance and the frequencies
involved. Power handling is expressed in wattage ie 100W.
Unfortunately this can be expressed in rms, max or peak music. The rms value (root mean square) is the only really relevant figure as this is the continuose handling power at 1 KHz. The impedance
is the resistance that the amp sees but is not a dc resistance and
varies with frequency. The lower the impedance the more power
will be drawn from the amp. In the event of a short circuit across
the speaker the amp will try to deliver infinite power into an infinitly
small load in an infinitesimal amount of time and will self destruct.
Using an 8 Ohm speaker draws less power than a 6 Ohm speaker.
Connecting speakers in parallel; results in the impedance beingreduced. For example two 8 Ohm speakers in parallel will result
in a 4 Ohm impedance load but in series will be 16 Ohms.
Incidentally the the .1 (5.1) is the sub woofer which only has
to handle the bass frequencies, a small percentage of the
amplifiers overall frequency response..
Connect your speakers and then power up the amp last
after double checking there are no shorts on the speaker
cables.
All the very best from Vintie.





Jan 07, 2017 | Audio Players & Recorders

1 Answer

Some times speaker not working.after switching off the devise it will work.while we try to increase the sound,only call volume will increase. what is the easy way to solve this trouble?


What is the make and model?
ELECTREPAIRUSA@ELECTREPAIRUSA or you can contact us at that address as we repair/renovate all items electronic and electrical old and new.

Mar 08, 2016 | Audio Players & Recorders

2 Answers

I have a Sony sound bar Model CT380. It has HDMI ARC and optical digital connections. The TV does not have these connections. What can I do to work around this?


How to connect a TV Sound Bar system to a television. - SONY

https://us.en.kb.sony.com/.../how-to-connect-a-tv-sound-bar-system-to-a...
Jump to If your TV has an HDMI terminal (without ARC) and an ... - Then connect theTV's Optical digital ... If your TV does not have HDMI input ...

2.1 ch Soundbar with Bluetooth ' HT-CT380 ' Sony US

www.sony.com/electronics/sound-bars/ht-ct380

Sony Corporation
Rating: 4.1 - ‎9 reviews - ‎$249.99
Discover the 2.1 ch Soundbar with Bluetooth from Sony & explore all the Sound Barsfeatures. ... filter higher frequencies to distribute audio smoothly around the room. ...against the sound bar to make an instant Bluetooth connection. No NFC? ... the HT-CT380 to allow data to pass through the sound bar straight to your TV ...

Dec 28, 2015 | Sony Audio Players & Recorders

2 Answers

Marantz how to connect 6005 amplifier to ipod


There are many solutions, I show two. The tip photo, shows a more expansive one. the lower photo the cheaper one. But both have two tulip plugs on the side for the amplifier and one 3,5 mm stereo telephone plug to the other side.
I tried both on a good stereo set, and could not hear different quality in sound. My guess, the quality comping from my iPods, iPhone and iPad is not the same as from my CD player. On the CD player, a better cable proved to give a better sound.


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May 26, 2014 | Audio Players & Recorders

2 Answers

I have a Rowe R80 jukebox and after moving it it has no sound through the speakers I am in New Zealand


Well, in addition to all the fine suggestions that are here, I would like to add the simple and easy things that may have happened during the move.

IF YOU ARE NOT GETTING A LOUD POP WHEN THE MACHINE IS POWERED ON.......

1) Make sure that the wires on the terminals below are still connected to the screws. There is one ground and one each for left and right. The lower the tap the lower the (max) volume of the jukebox.If they are not connected there will be no sound.
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There is a jumpers on the terminal strip where the volume control connects. Make sure that these connections are correct and tight. Also make sure that the jumpers did not fall off.
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If you are getting the loud pop in the speakers when the power is turned on .....

Check the plug on the side of the mechanism, just below the back of the tone are.(looks like a little tube socket) Check to see that it is connected to the mech and the CORRECT PLACE on the amplifier. It mat be possible to have this end in the wrong place. bf77613e-82a3-4e37-b8fe-cc80f4d4dbcb.jpg

Check all all your connections against the pic.

I hope this was helpful.

Mar 24, 2014 | Audio Players & Recorders

1 Answer

I'm trying to locate a conversion plug, the subwoofer is a JVC powered sub . The connecter number is xv - thm 505. Next numbers are xv- thm 606 I need a female RCA to the sub 8 pin mini din W


not sure where you are based, but have you tried maplins electronics store? They tend to carry a large stock of lpugs and cables, plus they do seem to deal with audio equipment. Good luck.

Mar 20, 2013 | Audio Players & Recorders

2 Answers

Connect an active soundbar to a receiver


What if the soundbar is Bluetooth? Will I still be able to use that function and connect the active soundbar to the tv (Bluetooth) and connect the av receiver for other surround sound speakers? (they are pre-wired in the walls in the apartment I moved into)

Jan 08, 2013 | Audio Players & Recorders

1 Answer

Wailing sound when 1971 seeburg juke box is started


I amnot very familiar with Seeburgs but the trip switch activates at the end of the record playing and THAT mutes the amp. The amp should also be muted until the tone arm lands on the record. So I would suggest the problem is in the amp.

May 05, 2009 | Audio Players & Recorders

7 Answers

A/C Adapter Noise and Interference


I just got my radio and home kit today, the hi pitched noise is awful so I looked online and found you.  I finally hooked the car adapter into a wall plug adapter and volla- NO NOISE!  Whew. It's a $9 adapter I got for my ipod car adapter....just has a hole to plug in the car adapter and you plug it into the wall.  
...good luck

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