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    #16
    Originally posted by swayzak View Post
    Even with subwoofer connected ?
    Probably reduces the impact, but I don't recall what frequencies the sub cuts off at, so it depends on the music as to how much sound energy this takes away from the stereo drivers.


    Transcoded from Matt's brain by Tapatalk
    --
    Hardware: 3x Touch, 1x Radio, 2x Receivers, 1 HP Microserver NAS with Debian+LMS 7.9.0
    Music: ~1300 CDs, as 450 GB of 16/44k FLACs. No less than 3x 24/44k albums..

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      #17
      Sub Out on Boom is 100 hz. My Boom's speakers still degraded even using sub.

      Comment


        #18
        Originally posted by toby10 View Post
        ...My Boom's speakers still degraded even using sub.
        Yes, same here, never exceeded 50% volume, attached to a sub, both Boom woofers split. (Repaired by me, new foam surrounds).
        Server - LMS 8.4.0 RPi4B 4GB/NanoSound ONE case/pCP 8.1.0 - 75K library, playlists & LMS cache on Sata SSD (ntfs)

        Lounge - DAC32 - AudioEngine B2
        Office - RPi 3B+/HiFiBerry DAC HAT/RPi screen - Edifier D12
        Bedroom - Echo Show 8

        Spares - 1xSB Touch, 1xSB3, 4xRPi, AVI DM5 speakers

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          #19
          How do I tell that the speakers have the widely reported problem ?

          I can't really see the speakers in detail through the grills, and don't really want to take them off if possible.

          Is it audibly obvious ?
          Touch x 2, Booms x 2, Squeeze Cntrl on Samsung S9+ (Duet Receiver + Controllers x 2 - semi-retired)

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            #20
            Originally posted by swayzak View Post
            How do I tell that the speakers have the widely reported problem ?

            I can't really see the speakers in detail through the grills, and don't really want to take them off if possible.

            Is it audibly obvious ?
            Usually audible, yes. I have set up a blog post that describes why it happens and how to detect the bass distortions (with special samples created for this purpose), including how to disassemble the Boom and how to fix it. Grille removal is only the very first step and is actually really easy if you have an appropriate tool. But actually it is easier to listen because the cracks in the speaker surrounds are hard to see as long as they sit in their place.
            See here for details: http://joes-tech-blog.blogspot.com/2...adio-bass.html
            sigpic

            PN me if your Boom / Classic / Transporter display has issues!

            Blog: https://www.blogger.com/blogger.g?ri...50753#allposts

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              #21
              Originally posted by JoeMuc2009 View Post
              Usually audible, yes. I have set up a blog post that describes why it happens and how to detect the bass distortions (with special samples created for this purpose), including how to disassemble the Boom and how to fix it. Grille removal is only the very first step and is actually really easy if you have an appropriate tool. But actually it is easier to listen because the cracks in the speaker surrounds are hard to see as long as they sit in their place.
              See here for details: http://joes-tech-blog.blogspot.com/2...adio-bass.html
              Interesting observation that the boom merges left/right low frequencies. This, I suspect, is either a deliberate design choice built into the DSP or a consequence of transmission using a lossy compression format. (Being joint-stereo not true two independent l/r channels.)


              Transcoded from Matt's brain by Tapatalk
              --
              Hardware: 3x Touch, 1x Radio, 2x Receivers, 1 HP Microserver NAS with Debian+LMS 7.9.0
              Music: ~1300 CDs, as 450 GB of 16/44k FLACs. No less than 3x 24/44k albums..

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                #22
                Actually it's pure physics. If you push one speaker in carefully in a unit that has no power connected, the other will pop out nearly the same amount. It's an air-tight enclosure where the bass woofers are the only moving parts connecting the inside of the case to the surrounding air.
                This also means, if one bass moves, e.g. from my sample that plays a frequency just on one side, the other base is passively moving along with that. And thereby causing sound, even though it is not driven by anything but the vacuum and pressure generated by the bass on the other side. That makes it impossible to check both speakers separately unless the case with its air-tight seal is opened.
                A "mono" bass where both channels are exactly in phase might cancel itself out because both speakers try to push simultaneously out which creates a stronger internal vacuum, and pull in simultaneously creates the respective amount of pressure. This makes bass movement considerably hard. That's where they do some DSP trickery, I think. Putting the bass just a little out of phase on one side might resolve this for good, without a noticeable effect on what your ears perceive.
                All this might be completely wrong but if it isn't, it makes the Boom a true engineering marvel.
                Last edited by JoeMuc2009; 2017-11-11, 13:00.
                sigpic

                PN me if your Boom / Classic / Transporter display has issues!

                Blog: https://www.blogger.com/blogger.g?ri...50753#allposts

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                  #23
                  Originally posted by JoeMuc2009 View Post
                  Actually it's pure physics. If you push one speaker in carefully in a unit that has no power connected, the other will pop out nearly the same amount. It's an air-tight enclosure where the bass woofers are the only moving parts connecting the inside of the case to the surrounding air.
                  This also means, if one bass moves, e.g. from my sample that plays a frequency just on one side, the other base is passively moving along with that. And thereby causing sound, even though it is not driven by anything but the vacuum and pressure generated by the bass on the other side. That makes it impossible to check both speakers separately as long as the case with its air-tight seal is opened.
                  A "mono" bass where both channels are exactly in phase might cancel itself out because both speakers try to push simultaneously out which creates a stronger internal vacuum, and pull in simultaneously creates the respective amount of pressure. This makes bass movement considerably hard. That's where they do some DSP trickery, I think. Putting the bass just a little out of phase on one side might resolve this for good, without a noticeable effect on what your ears perceive.
                  All this might be completely wrong but if it isn't, it makes the Boom a true engineering marvel.
                  Have you seen this?



                  Click image for larger version

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                  Server - LMS 8.4.0 RPi4B 4GB/NanoSound ONE case/pCP 8.1.0 - 75K library, playlists & LMS cache on Sata SSD (ntfs)

                  Lounge - DAC32 - AudioEngine B2
                  Office - RPi 3B+/HiFiBerry DAC HAT/RPi screen - Edifier D12
                  Bedroom - Echo Show 8

                  Spares - 1xSB Touch, 1xSB3, 4xRPi, AVI DM5 speakers

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                    #24
                    wow, no, never got this as a complete document. Great, thank you!
                    sigpic

                    PN me if your Boom / Classic / Transporter display has issues!

                    Blog: https://www.blogger.com/blogger.g?ri...50753#allposts

                    Comment


                      #25
                      I've seen this before, which is why I wouldn't be surprised if they push the low frequencies into mono and drive both speakers with it. The point of the DSP design is to maximise low frequency output and in a box this small no-one is ever going to get a sense of stereo separation below about 100hz.



                      Transcoded from Matt's brain by Tapatalk
                      --
                      Hardware: 3x Touch, 1x Radio, 2x Receivers, 1 HP Microserver NAS with Debian+LMS 7.9.0
                      Music: ~1300 CDs, as 450 GB of 16/44k FLACs. No less than 3x 24/44k albums..

                      Comment


                        #26
                        OK now I understand why the sound is so bad on my Boom !
                        Click image for larger version

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                          #27
                          Distorted bass on the left but no visual damage

                          Hi,

                          I just suffered from the distorted bass on the left woofer, I've opened up the boom as I've seen the comments on the deteriorating glue on the speaker rings.
                          However there is nothing noticeable on the speakers, they look like mint condition, i cannot spot any tear after thorough inspection.

                          Could it be an electronic component or is there anything else I could try?
                          Mid and high tones are perfect.

                          Thanks

                          Comment


                            #28
                            Is Boom speaker deterioration inevitable ?

                            I don't think it's deteriorating glue that attaches the speakers but
                            rather deterioration of the speaker surrounds themselves - the material
                            that supports the cones themselves.

                            [Update 201 6-06- 14] A new blog entry describes the VFD display replacement pro cedure (another popular Boom issue). See here if...


                            Joe does this work and he has low frequency files to test your speakers on
                            that page.

                            Best wishes,
                            David


                            On Fri, Mar 23, 2018 at 4:53 AM, Neusdoorn <
                            Neusdoorn.8ekv40 (AT) no-mx (DOT) fo...limdevices.com> wrote:

                            >
                            > Hi,
                            >
                            > I just suffered from the distorted bass on the left woofer, I've opened
                            > up the boom as I've seen the comments on the deteriorating glue on the
                            > speaker rings.
                            > However there is nothing noticeable on the speakers, they look like mint
                            > condition, i cannot spot any tear after thorough inspection.
                            >
                            > Could it be an electronic component or is there anything else I could
                            > try?
                            > Mid and high tones are perfect.
                            >
                            > Thanks
                            >
                            >
                            > ------------------------------------------------------------------------
                            > Neusdoorn's Profile: http://forums.slimdevices.com/member.php?userid=62718
                            > View this thread: http://forums.slimdevices.com/showthread.php?t=107832
                            >
                            >

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                              #29
                              Originally posted by Neusdoorn View Post
                              Hi,

                              I just suffered from the distorted bass on the left woofer, I've opened up the boom as I've seen the comments on the deteriorating glue on the speaker rings.
                              However there is nothing noticeable on the speakers, they look like mint condition, i cannot spot any tear after thorough inspection.

                              Could it be an electronic component or is there anything else I could try?
                              Mid and high tones are perfect.

                              Thanks
                              The tearing of the bass surround is not always visible unless you disassemble the Boom to free the woofer chassis (which you will have to do anyway to repair it).
                              See here for advice: http://joes-tech-blog.blogspot.com/2...adio-bass.html
                              sigpic

                              PN me if your Boom / Classic / Transporter display has issues!

                              Blog: https://www.blogger.com/blogger.g?ri...50753#allposts

                              Comment


                                #30
                                Replacement bass drivers

                                Hi all,
                                bumping this thread to hopefully get some detailed info.

                                Got the dreaded bass fart last week and today found some time to investigate.

                                Looks like the drivers are near impossible to get here in Oz.

                                so.... I was hoping that some of you legends would have an old ORIGINAL driver that has already been removed from the boom case, that you could run the ruler over and get some accurate detailed dimensions.
                                Then it should not be too hard to find a replacement that actually fits.

                                ( I would like to order replacement drivers before pulling mine apart otherwise I would do the measurements my self.)

                                Anyone up for the challenge ??

                                Distance between opposite mounting hole centres
                                Depth of the driver from the mounting flange to the back of the magnet
                                Diameter of the opening in the front case baffle
                                Distance between the edge of the "front baffle hole" and the centre of one of the mounting screw holes

                                Any other measurements that you can make.

                                My gratitude would be immense for this vital info that everyone can use.

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