bit of a weird question - CE32A-4 in both series and parallel

3rutu5

Member
2018-07-18 11:57 am
i was watching a video where a gentleman had 3 CE32A-4 per channel wired in series, which sounds like it would put the Ohms less than 2. Lets say i wanted to make a fun little BT speaker and wanted to run 4 per side, could you wire 2 separate pairs in series to get 2ohms each and then run the pairs in parallel to get back to 4ohms?

Am i thinking of this to simplistically or is there something else i should be thinking about?

i thought 1 per channel isnt enough, but 4 each side on a class D PAM chip board (2x15 watts) might be a fun small project coupled with some cheap passive radiators i stupidly bought from china (70x40mm x2)
 

TMM

Member
2007-09-01 8:37 am
Australia
Yep, that works just fine. With the series+parallel connection of 4 drivers, you get +6dB sensitivity compared to a single driver but with exactly the same 4ohm impedance load on the amplifier. The only downside is the combing effects of a speaker array.
 
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woody

Member
Paid Member
2002-01-15 12:57 am
Tyrone Ga. U.S.A.
If he had them wired in series that would make the group of them 16 ohms not 2 ohms and the sensitivity would be 78 db/w that's pitiful just pitiful and then what was that fs about 230 hz . Even wired series parallel for a 4 ohm load you still only get 86db/w. This might give you better preformance and be a little cheaper. HiVi C3N-III 3" Paper Cone Full-Range Driver
 

3rutu5

Member
2018-07-18 11:57 am
Thanks, i guess why i was thinking this was to build something really small. 3inch would be too big.

I'm just finishing a build with the Dayton Audio ND65's, which is relatively small (2x 0.045cuft internals). but i just wanted to go both smaller driver and smaller enclosure. Is there anything people have built (successfully) that uses a driver less than 2inches and maybe 0.05cuft in total or less?
 

3rutu5

Member
2018-07-18 11:57 am
Guys I've purchased some visatron BF 37 drivers, they are small and I want an equally small enclosure. I have 4 of them coming and they do have a low sensitivity of about 74db. I'm being a bit of a scrooge here with size as I want it to be my take on a Bose SoundLink mini hence 0.01cuft each or less. It will be using 2* Chinese oval PR'S and a PAM chip amp around 2*15 watt max. If I run the 2 each side it would have to be in series then as they are 4 Ohm drivers but won't get the size as the requirements will double with 4 drivers... interesting times for a battery powered tiny speaker