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Building my first Bluetooth speaker (need help with box)  

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3vilD3mon
(@3vild3mon)
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22/05/2020 2:43 pm  

Hi I'm building my first Bluetooth speaker but not sure on the box, if I did it right , my speaker is the sb acoustic sb16pfcr25-4-coax , here is pics of it on winlsd , the last picture is the curve for rear port velocity. Thank you in advance for any help 🙂 I made it larger than what sd recommended cause I wanted a better lower end response.and yes it is large. also i'm running four drivers.

20200522 143243
20200522 143252
20200522 143312 HDR
20200522 143304 HDR
20200522 143352
20200522 143325

  


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123Toid
(@123toid)
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22/05/2020 11:18 pm  

@3vild3mon I am glad I reread that - 4 drivers, otherwise that would be huge!  Your first port resonance is not in a great spot.  I would add the amount of power you plan to give in the signal spot and then check your cone excursion.  Keep in mind, the power given should be for all 4 drivers, not one. 


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3vilD3mon
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23/05/2020 8:42 am  

@123toid Yes i realized i just did one , so i put the full power and it was still under the recommend port noise, cone excursion is good except a big leap in 27 hz range, i watched your video on it , if i add a 20hz high pass filter the cone excursion is good. 


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3vilD3mon
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23/05/2020 9:11 am  

@123toid this is how it looks when I do the full 100w and here is the cone excursion , with and without a 20hz high pass filter, I know I'm under powering them a bit but I have the two speakers hooked up to just the left channel right now and I'm happy with the output.

20200523 090251 HDR
20200523 090325
20200523 090338 HDR

 


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123Toid
(@123toid)
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23/05/2020 10:54 pm  

@3vild3mon

With all that data everything looks good.  Looks like a great project.


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3vilD3mon
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25/05/2020 6:33 pm  

@123toid great , thank you very much. Just wondering on how i should do the high pass filter ? like how to make one or find one to purchase ?


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123Toid
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26/05/2020 2:03 am  

@3vild3mon

How are you planning on using this? Just music? What kind? It's hard to tell from your graph, but it looks like excursions not an issue until the 20 Hertz range. If that's the case, you may not even need to do anything. That's only going to become a problem if you're playing that frequency or lower. I personally can't think of a lot of music that does that. 

However if you think it's going to be an issue, will these be passive or active speakers?


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3vilD3mon
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26/05/2020 3:26 am  

@123toid I will be using it for music and ya most likely I won't be planning much notes down that low , so I guess I will just leave it 🙂 makes it more simple 🙂 thank you again 


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123Toid
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26/05/2020 1:02 pm  

@3vild3mon

You're welcome. Looks like a cool project. I'd love to see photos when you're finished.


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3vilD3mon
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26/05/2020 9:45 pm  

@123toid no prob i will post pics 🙂 just might be a while , i always got so much stuff going on  


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3vilD3mon
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03/08/2020 4:13 pm  

hello , have an update , bought wood and cut all the pieces. just need to buy support bars but not sure if i really need them. was going to put them across where the drivers are which are near the top 

thumbnail 20200803 151340
thumbnail 20200803 151224

 


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3vilD3mon
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03/08/2020 5:21 pm  

also sadly winisd crapped out on me now. non of the original drivers that the program came with are compatible anymore and every time i try to do something i get a floating point error... ugh 


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