Free Shipping on All Orders 1-866-764-1801

Vist our Online Store
+ Reply to Thread
Results 1 to 16 of 16
  1. #1

    Member Sales Rating: (0)

    Join Date
    Jan 2008
    Posts
    138

    Default Bose 901 series III PROBLEM!

    Bought some great shape 901s (for my dad), which have apparently been refoamed.

    Hook them up, and anything with bass it buzzy distorted. Yes the EQ is hooked up. It seems like the 1 of the speakers in the back of each of the cabs, is either totally blown, or did not get refoamed right. Any tips on how to tell, they all look the same? Also what are the chances of the same speaker(location) in each cab getting blow? When looking from the back it seems to be the lower most left speaker(s). Any tips?

  2. #2

    Member Sales Rating: (3)

    Join Date
    Jan 2009
    Location
    Northern CO.
    Posts
    2,429

    Default

    push it evenly around the cone and see if the vc scrapes, pull the suspect ones and unhook them make sure the wires don't touch and see if it stops If the re-foam was not done right and the vc is not aligned properly it might be the problem.

  3. #3

    Member Sales Rating: (0)

    Join Date
    Jan 2008
    Posts
    138

    Default

    I don't see any screws/bolts, just holes? Did the series III have like a locking driver position? There doesn't seem to be anyway to get them out.

  4. #4

    Member Sales Rating: (1)

    Join Date
    Dec 2008
    Location
    New York
    Posts
    2,560

    Default

    Series III--1976 to 1978, Acoustic Matrix (ported cabinet) Drivers use 3 bolts.

  5. #5

    Member Sales Rating: (3)

    Join Date
    Jan 2009
    Location
    Northern CO.
    Posts
    2,429

    Default

    this might help could be glued in or the gasket is acting as glue, might have to pry on it gently

    http://www.audiokarma.org/forums/sho...d.php?t=148636
    Last edited by zarrdoss; 08-12-2009 at 10:38 PM.

  6. #6

    Member Sales Rating: (0)

    Join Date
    Jan 2008
    Posts
    138

    Default

    It appears to be, on closer inspection. one group of the 4 back speakers. Which I hope is a wiring issue, cause how could 4 speakers next to eachother blow, but not that front, or other rear 4? I still can't get them out, maybe the guy glued them in, if he took them out to refoam them:(

  7. #7
    Audiophile
    Member Sales Rating: (30)

    Join Date
    Mar 2006
    Location
    Seattle
    Posts
    11,188

    Default

    Quote Originally Posted by c_corie View Post
    Bose 901 series III PROBLEM!
    It's because they are Bose 901s... :p

    It does sound like a wiring issue if it is a group of drivers, but that still wouldn't account for the buzzing.

  8. #8

    Member Sales Rating: (17)

    Join Date
    Jul 2001
    Location
    Northern Colorado
    Posts
    12,075

    Default

    It would take a lot to actually blow any of the speakers. I'm guessing some were not lined up properly by whoever refoamed them. As said above, push them in and see if the voice coil is rubbing. I doubt (but don't know) if they have an electronic network of any kind in side so probably not a wiring problem.
    madmax
    Vinyl, the final frontier...

    Avantgarde horns, 300b tubes, thats the kinda crap I want... :D

  9. #9

    Member Sales Rating: (26)

    Join Date
    Jun 2009
    Location
    Salinas, CA
    Posts
    5,018

    Default

    +1 with what everyone has said due to the voice coil rubbing. I mean think about it, if he had to refoam all of those drivers or even half of them there's always a possibility of him making a mistake. That or getting fed up after refoaming the 4th, 6th or even 12th driver and just not paying as close attention as you would after the first one.
    Truck setup
    Alpine 9856
    Phoenix Gold RSD65CS

    For Sale
    Polk SR6500
    Polk SR5250
    Polk SR104



    Quote Originally Posted by heiney9 View Post
    Any clue how to use the internet? Found it in about 10 sec.

  10. #10

    Member Sales Rating: (0)

    Join Date
    Jan 2008
    Posts
    138

    Default

    So voice coil rub would/is causing what sounds like a badly distored output especially on low freqs? The cabinets are in PERFECT shape for the late 70s, and so is the EQ, but my dad is now considering trading them in, for the Bose new 901 upgrade. They said something like $599, but I still feel terrible that I didn't notice these speakers were making that sound when I went to check them out for him. (Low volume and no EQ hooked up, so I figured that's what they sound like.)

    So should I try to refoam, the ones that need it? It seems like it maybe around 8 of the drivers need it, just by listening to them speaker by speaker. OR should he just trade them up towards brand new ones at what still really is like a $500 discount (after factoring in buying the first set was $250.)?

  11. #11

    Member Sales Rating: (26)

    Join Date
    Jun 2009
    Location
    Salinas, CA
    Posts
    5,018

    Default

    If its even 8 of them then I can't really say what the culprit here might be. As far as determining whether or not it IS the actual voice coils, you would have to get to each driver and apply pressure evenly on the cone. If you hear a "rubbing" noise of some sort from some but not from others, it means the voice coil is rubbing all because the cone wasnt sitting in its place properly while being refoamed. The surrounds could actually cause a little bit of "pulling" when the drivers show excursion. Test each one out as well to make sure none of them are blown, goodluck to ya anyway though with what you decide.

    Keep in mind, even though one member mentioned they can handle huge amounts of power, if they were damaged I'd have to say possibly because they were being underpowered while being played at high levels.....that is if the issue were something else.
    Truck setup
    Alpine 9856
    Phoenix Gold RSD65CS

    For Sale
    Polk SR6500
    Polk SR5250
    Polk SR104



    Quote Originally Posted by heiney9 View Post
    Any clue how to use the internet? Found it in about 10 sec.

  12. #12

    Member Sales Rating: (0)

    Join Date
    Dec 2009
    Posts
    3

    Default

    Hi, I see it's a little late for ansver of this quest, but if someone need, I can share my experience with BOSE 901-III.
    I own 2 pairs of them,a EQ-IVs,a 550Receiver and Spatial Receiver.;)
    And in the begining met similar problems...

  13. #13

    Member Sales Rating: (16)

    Join Date
    Oct 2008
    Location
    Jessup Pa
    Posts
    1,073

    Default

    I had those speakers and were not a big fan of them. I sold them and bought more vintage Polk speakers and never looked back. The bose 901 series 6 speakers are better then series 3 and don't have foam to rot. They do not compare to SDA speakers and are pathetic compared to SRS speakers.
    Polk HT system 1: LSIC, LSI25 mains, LSI F/X rears, Lsi F/X rear centers,
    Yamaha RX-V2500 System, Sunfire grand 5 channel, Carver A753 3 channel amp.

    Polk HT system 2: ,Polk CS1000 center, Polk cs400rear center, Polk RT800 mains stacked with RT55's, Polk F/X 1000 rears running on a Yamaha RX-V2200

    Polk Speaker collection: SDA SRS 1.2tl x 2, SRT system, SDA SRS 2 P/B, SDA 2A, SDA 1C Studio, SDA CRS+, Monitor 12 series 2, 7B & 4, SRS 3.1tl, RTA 15tl, LS90

  14. #14

    Member Sales Rating: (0)

    Join Date
    Dec 2009
    Posts
    3

    Default

    Yes,I'm very far from the thought, they are the best speakers :-)
    If I compare them, it can be only with full-range speakes.
    Reading contrary opinions about 901s, I became very curious about them. That's why I decided to try 901s at home. In the begining met big difficultys. But in the time overcomed some of them and have some explanations...

  15. #15

    Member Sales Rating: (49)

    Join Date
    Jan 2009
    Location
    Wyred 4 Sound
    Posts
    11,240

    Default

    Quote Originally Posted by ctef View Post
    Yes,I'm very far from the thought, they are the best speakers :-)
    If I compare them, it can be only with full-range speakes.
    Reading contrary opinions about 901s, I became very curious about them. That's why I decided to try 901s at home. In the begining met big difficultys. But in the time overcomed some of them and have some explanations...


    Welcome to club polk! ;)

  16. #16

    Member Sales Rating: (0)

    Join Date
    Sep 2008
    Location
    Antarctica
    Posts
    152

    Default

    Quote Originally Posted by TOOLFORLIFEFAN View Post
    Welcome to club polk! ;)
    http://stores.ebay.com/Polk-Audio-Direct

Thread Information

Users Browsing this Thread

There are currently 1 users browsing this thread. (0 members and 1 guests)

     

Similar Threads

  1. Bose 901 series III-VI foam question.
    By c_corie in forum 2 Channel Audio
    Replies: 25
    Last Post: 03-09-2012, 11:39 PM
  2. Bose 901...Series VII???
    By dougy in forum 2 Channel Audio
    Replies: 77
    Last Post: 09-20-2011, 12:43 AM
  3. Bose 901 Series II question
    By rcs in forum Vintage Speakers
    Replies: 22
    Last Post: 10-03-2007, 02:24 PM
  4. Bose 901 Series V
    By kelley in forum Speakers
    Replies: 18
    Last Post: 12-01-2004, 12:33 AM
  5. FS: Bose Acoustimass 3 Series III System
    By mikejz84 in forum Flea Market
    Replies: 6
    Last Post: 07-05-2004, 02:55 PM

Posting Permissions

  • You may not post new threads
  • You may not post replies
  • You may not post attachments
  • You may not edit your posts