Question about Audio Players & Recorders

1 Answer

Unit operates correctly for a period of time then the sound begins to distort / muffle and if left for a short period the muffle gets worse until the sound gets lower and finally mutes. Turn the unit off for a couple of minutes, turn back on and the problem is rectified (until next time). This normally occurs after operating the unit for 1.5 - 2 hrs so if watching an afternoon of sport you may need to perform this off / on procedure 3-4 times.

Posted by on

  • tonyh529 Mar 31, 2011

    Sorry, thought model was in the heading. Its a Bose 321. The problem has been going on for years. Took it to a tech who spent 5 weeks with it, told me he could only get it to fault after days of use (not 1 hr use which is the real problem). He didn't know what the fault was but thought it was from one of the boards and he could start replacing at 3-4 hundred a shot to sort problem. I see no need to go into any further detail re what I told him to do with his repairs.
    There is no dust / blockage on the unit and in the cabinet it has a minimum of 6cm around side / top for cooling.

×

1 Answer

  • Level 3:

    An expert who has achieved level 3 by getting 1000 points

    All-Star:

    An expert that got 10 achievements.

    MVP:

    An expert that got 5 achievements.

    Brigadier General:

    An expert that has over 10,000 points.

  • Master
  • 8,546 Answers

If you identify the product by make and model it may lend us some clues.


That it is cyclical and repeatable suggests heat. When it begins to malfunction feel the top for excess heat.

Generally speaking, an amp protects itself from heat, shorts, overloads and operator exuberance by refusing to turn on or stay on. That yours dies a slow agonizing death implies a component failing gradually rather than the usual sudden self-protection that is usually designed in to prevent lasting damage.


Overloads can be from excessive periods of high output or marginally low impedance loading by the speakers; and shorts would be wiring issues or a speaker blowing up.


You should be able to feel if it's hot. WHY is it overheating? Make sure it has sufficient ventilation on all sides and that vent holes are not blocked by dust balls. Ensure the fan (if equipped) is running as designed (some only operate on demand). Clean dust and debris from it.


If the amp comes back on after cooling, you're lucky. They only have so many self-protection cycles in their lives so continuously resetting or cycling their power without addressing the cause can do more harm than good.


If it protects immediately on a cool power up you should disconnect the speaker connections and try it 'naked'. If it comes up then diagnose which lead(s) are shorted. If it does not come up the problem is internal and should be left to an experienced and competent hands-on tech.

Posted on Mar 31, 2011

  • David Dunn
    David Dunn Apr 01, 2011

    So what about your environment that tickles the failure? Besides the minimum required clearance, is the unit actually becoming overheated?

    So the bottom line is it's probably not economically repairable. You don't mention the series but you might find a new Powered Subwoofer module on eBay that's cheap or cheaper than a shot in the dark repair...
    http://cgi.ebay.com/BOSE-Acoustimass-PS-...
    http://cgi.ebay.com/BOSE-321-SERIES-2-PO...
    http://cgi.ebay.com/BOSE-PS-321-Powered-...
    http://cgi.ebay.com/BOSE-GS-PS321-SERIES...
    http://cgi.ebay.com/BOSE-AV-321-3-2-1-SE...

    If you decide to bid on one takle some advice from an experience eBay buyer who never pays more than he wants to - bid your maximum price one time at about 7 seconds before the auction ends. Make sure to leave time for the confirmation step. To bid earlier is to force a counter bid and, in effect, bid against yourself.

    ****
    Regarding the heading and model number not showing to me/us... If YOU would complain to Fixya support that that is the case it might convince them that there really IS a problem with that assumption being pretty much universally understood by the clients but incorrect. I have mentioned it several times to them and they just think you guys aren't smart enough to include make/model data in the first place. I contend there is something that leads you to believe that it will come through. If YOU complain maybe they'll fix it and I/we will spend less time asking for the information you believe we are be seeing.

×

1 Suggested Answer

6ya6ya
  • 2 Answers

SOURCE: I have freestanding Series 8 dishwasher. Lately during the filling cycle water hammer is occurring. How can this be resolved

Hi,
a 6ya expert can help you resolve that issue over the phone in a minute or two.
best thing about this new service is that you are never placed on hold and get to talk to real repairmen in the US.
the service is completely free and covers almost anything you can think of (from cars to computers, handyman, and even drones).
click here to download the app (for users in the US for now) and get all the help you need.
goodluck!

Posted on Jan 02, 2017

Add Your Answer

Uploading: 0%

my-video-file.mp4

Complete. Click "Add" to insert your video. Add

×

Loading...
Loading...

Related Questions:

1 Answer

Unit will show correct depth for a short time and then reset to 2.2 feet and stay at that reading for long periods of time!


I assume that when it resets to 2.2 feet that the readout is flashing. If so the it sounds like you have a bad transducer as the problem has been getting progressively worse.
The transducer needs to be replaced. Sounds like the sending crystal is fractured.

Aug 06, 2014 | Lowrance X135 Power Pro Sonar Without...

1 Answer

My 10 inch kickers sound distorted not clear at at and muffled


Does the enclosure volume and style/type match the sub requirements? Are the subs wired correctly? I've seen lots of marking on the wrong terminal. Try switching one of the subs from pos to neg and neg to positive. It will be dramatic and very noticable if that's all it is.
Is your cutoff frequency correct for the sub? Make sure they're not getting full spectrum frequency. Are the Subs physically hitting any part of the enclosure at any point in the excursion? Are they screwed securely to the enclosure? Is the sub surround intact and smooth through the full extcurion? Is the amp ok? Got enough current throughout the system? Battery, Capacitor, Wiring, fuses, speaker wire etc. Bigger is better but always the correct fuse rating.
Signal from the head unit? Proper preamp wiring?

Jan 25, 2014 | Kicker Car Audio & Video

1 Answer

Car starts and runs perfectly until engine reaches operating temp then loses power starts poping spitting firing all over the place until it dies. then it wont start again for 2-3 hours until engine cools...


Possibly the catalytic is plugged. How to know? Has this been getting worse over short time period week or two? Check out at exhaust shop..
Good luck.

Aug 18, 2011 | 1997 Chrysler Sebring

1 Answer

The unit begins and after a short time the unit stops.


it sound like the unit is very low on r134a refrigerant and in being so the compressor is overheating and the thermocouple sensor on the compressor body is shutting off power to compressor to keep it from burning up

Jan 17, 2010 | Frigidaire FDL25P1 Dehumidifier

1 Answer

Need to change the time


You weren't precise if the change was due to Daylight Savings Time or just a general need to change the time so I'm giving you the complete set of instructions for changing the time

Setting the Time
Note: Use 24 hour and 60 minute format when setting the time.
For example: 2:00 pm = 14:00.
1. To make changes to your clock’s time setting, you must first put the clock into Program mode. See
section Accessing Program Mode to Update Calendar, Time and DST for instructions. When the
display flashes P1 dAtE, press the ◄ left button until P2 CL oc appears, then press the ● right
button.
2. Press the ◄ left button to choose 12-hour AM/PM display or 24-hour military time, then press the ●
right button.
3. Press the ◄ left button until the correct hour appears, then press the ● right button.
4. Press the ◄ left button until the correct minutes appear, then press the ● right button.
5. When the display flashes the correct time, press the ● right button.
6. The display flashes P2 CL oc again. To make changes to the DST start date or DST end date, press
the ◄ left button one time until P3 BDLE appears in the display and continue to How to Set the
Begin Date for DST. Otherwise, press the ◄ left button several times until END appears, and select
the ● right button to save your updated settings.
How to Disable DST
To disable Daylight Saving Time, set the DST beginning date equal to the ending date (i.e., DST begin
date = 08-03-09; DST end date = 08-03-09).
See next for details regarding setting the DST begin date and end date. Typically, clocks operating in
Arizona, Hawaii and Puerto Rico do not observe DST, and disabling the DST function typically applies to
those areas only.
By default, and unless otherwise modified, DST takes effect on the first Sunday in April and ends on the
last Sunday in October (this was the United States standard through 2006).
How to Set the Begin Date for DST
Note that in 2007 the standard for DST changes to a different start date and end date. The steps below
correct the change in the new start date for DST. The new start date and end date need only be changed
once, since the clock’s rolling calendar function auto-calculates the start date and end date for DST every
year thereafter.
Note that if the begin date for DST has passed, in addition to modifying the begin date (and end date),
you will also need to modify the time.
1. When the display flashes P1 dAtE (see earlier section Accessing Program Mode to Update
Calendar, Time and DST for instruction), press the ◄ left button until P3 bdLt appears, then press
the ● right button.
2. Press the ◄ left button until the correct year appears, then press the ● right button.
3. Press the ◄ left button until the correct month appears, then press the ● right button.
4. Press the ◄ left button until the correct date appears, then press the ● right button.
5. When the display flashes the correct year, month and date, press the ● right button.
6. When the display flashes P3 bdLt, press the ◄ left button once to select next menu option, P4
EdLt, which provides a way to set the end date of the Daylight Saving period.
Setting Daylight Savings Time for model PIX-10/15/21
Page 4 of 4
How to Set the End Date for DST
Note that in 2007 the standard for DST changes to a different start date and end date. The steps below
correct the change in the new end date for DST. The new start date and end date need only be changed
once, since the clock’s rolling calendar function auto-calculates the start date and end date for DST every
year thereafter.
1. When the display flashes P4 EdLt (see conclusion of previous section How to Set the Begin Date
for DST for instruction), press the ● right button.
2. Press the ◄ left button until the correct year appears, then press the ● right button.
3. Press the ◄ left button until the correct month appears, then press the ● right button.
4. Press the ◄ left button until the correct date appears, then press the ● right button.
5. When the display flashes the correct year, month and date, press the ● right button.
6. The display flashes P4 EdLt again. Press the ◄ left button several times until END appears, and
select the ● right button to save your updated settings.
Note: To disable the Daylight Saving Setting, set the beginning and ending date to the same date.

Apr 16, 2009 | Office Equipment & Supplies

1 Answer

Distorted voice on computer music


go compaq .com download latest sound driver for your model under help drivers area k

Oct 07, 2008 | Compaq Presario SR1050NX (DW257A) PC...

1 Answer

Sporadic Discoloration & Distortion


Most of these monitors have a 3 year warrantly. Give them a ring and see if they will exchange it. No harm in trying!

Mar 22, 2008 | Acer AL1912B 19" LCD Monitor

1 Answer

JBL PSW D112 Distorted Sound


your memory is low on resources need to increase memory.everything on ur pc uses mem.audio and video devices use an aweful lot.if you have open another program not only will ur audio be distorted but ur other program will be running slow.
correct? need to add more ram.

Mar 07, 2008 | HP Pavilion dv4000 Notebook

1 Answer

Sudden color/picture distortion


you have a shorted green CRT that is affecting the other crts the short is internat to the crt that leaves what is called retrace lines. if the set is more than three years old then replace all three guns.

Feb 25, 2008 | Samsung TX-R3080WH 30" TV

2 Answers

JVC DVD player plays with distorted sound


Have you tryed a differant audio input on another set or on that same set. Are the audio cables good?? If all this is ok then the D/A converter inside the unit is defective and most likely it wont pay to repai sorry

May 25, 2006 | JVC XV-N40BK DVD Player

Not finding what you are looking for?
Audio Players & Recorders Logo

Related Topics:

19 people viewed this question

Ask a Question

Usually answered in minutes!

Top Audio Players & Recorders Experts

kakima

Level 3 Expert

102366 Answers

 Grubhead
Grubhead

Level 3 Expert

5020 Answers

The Knight
The Knight

Level 3 Expert

73740 Answers

Are you an Audio Player and Recorder Expert? Answer questions, earn points and help others

Answer questions

Manuals & User Guides

Loading...