Sylvania SP305 bluetooth portable speaker mod - diyAudio
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Old 27th December 2014, 03:43 PM   #1
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Default Sylvania SP305 bluetooth portable speaker mod

I 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. I have not tested them but there are other similar models like the Craig CR4189BT and a Proscan from Big Lots. 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. 1 g extends the bass to 100 Hz while 2 g extends it to 80 Hz with a slight reduction in mid-bass. 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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Old 1st January 2015, 11:54 AM   #2
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Has anyone else done this yet? I would love to hear some feedback.
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Old 2nd January 2015, 06:04 PM   #3
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After a little listening, I think it could use a little help on the high end. The original speaker has OK highs but only on-axis. It's a cheap speaker anyway so can anyone recommend a tiny tweeter or a replacement full-range driver with better highs. It's 4 ohms. I'm not sure how to measure a speaker this size but it's about 2 1/2 inches across the cone and 2 3/4 across the surround. I'm thinking an add-on tweeter might be better but it would have to fit between the 2 existing drivers.
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Old 2nd January 2015, 07:25 PM   #4
xrk971 is offline xrk971  United States
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If you ever want to build a BT/mp3 player from scratch without too much money: Vifa TC9FD drivers $24/pair. Sure TPA3110D2 8watt amp $10, BT module $15, DC-DC voltage converter for BT $5. Make either a MLTL, a Mini Karlsonator 0.4x, or a DCR box. It will sound very nice with full bass down to 55Hz.
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Old 2nd January 2015, 08:44 PM   #5
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I'll keep that in mind. I would also need a battery and charge circuit. I can see the Sylvania enclosure is too small for those speakers so definitely a scratch build.
On another note, Ive been wondering if I can access L and R channels separately on this thing but then again, the enclosure probably won't do well with 2 speakers with its volume. I figured it's about .15 cu ft. I'm all about keeping it simple on modifying such a cheap speaker.
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Old 18th January 2015, 06:49 PM   #6
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I found some info based on the FCC ID of the SP305 at the FCC ID Search page. It is manufactured by Winsonic as model WM2899. Here is a list of some other speakers that are similar and may benefit from this mod.

Winsonic WM2899
Naxa NAS-3040
EMB Euro10
SUPERSONIC SC-1321
Craig CR4189BT, CR4197BT, CR4191, CR4190, CR4198
QFX CS-224
Axess SP1002
Pyle Home PSBU9
Tectron HT-985
SoundLogic CWBS-6-5948

If you have one of these, any info including FCC ID from the label would be appreciated.
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Old 26th May 2015, 10:41 PM   #7
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Just checking back to see if anyone else has done this or any other mod.
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