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Sylvania SP305(DG), Craig CR4189BT and similar Bluetooth Tower Speaker Mods

Discussion in 'Android Accessories' started by chris1379, Dec 16, 2014.

  1. chris1379

    chris1379 Newbie
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    I just bought one of these from Dollar General for $15. It's not a bad speaker for the price and I saw right away that a simple mod can dramatically improve the bass. The lower speaker in the tower is not really a speaker but a passive radiator. Not only is it not larger than the driven speaker but it is poorly tuned resulting in hollow sounding boomy bass at best. All I did was add a little mass to the passive radiator to lower its resonance and the sound is much better. I glued 1 g of cardboard to the backside but this could be done many ways. I tried up to 3 g of additional mass but 1-2 g seems to work fairly well. I also see that a second speaker could be added or the cabinet could be used for a DIY portable speaker project. I'd be interested to know if anyone else has hacked on one of these.
     

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  2. chris1379

    chris1379 Newbie
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    Here are a few pictures. The cardboard disks add up to 1 g. This gives pretty good bass down to about 100Hz, which was barely audible before. 2 g improves the low frequency cuttoff but the resonance isn't as prominent. 20141214_140939.jpg 20141215_235354.jpg 20141216_000127.jpg
    If anyone has a suggestion as to a better forum to post this let me know.
     
    #2 chris1379, Dec 17, 2014
    Last edited: Dec 18, 2014
    mobappn1 likes this.
  3. chris1379

    chris1379 Newbie
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  4. mobappn1

    mobappn1 Lurker
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    What a mod speaker! Nice work
     

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