Bluetooth Loud Speaker Project

[The Architect]

Greetings Audio peeps, 

I'm working on building a bluetooth speaker, high emphasis on design asthetics, will be using natural wood, milled aluminum, etc. 

 

I've been doing my research day and night, for most part I have a clear idea of everything, but for the love of God, I just couldn't figure out the whole crossover business. 

 

I'm willing to get boards that will simplify the assembly process, mind you it will be a mono speaker. 

 

Here is my planned setup, 

 

Cabinet, 4". 4". 10"

Drivers, 2

 

Tweeter, 

https://www.parts-express.com/Peerless-BC25SC06-04-1-Textile-Dome-Tweeter-264-1028

 

Woofer,

https://www.parts-express.com/Peerless-SLS-85S25CP04-04-3-1-4-Paper-Cone-Woofer-4-Ohm-264-1600

 

Amplifier, 

https://www.parts-express.com/Dayton-Audio-KAB-100M-1x100W-Class-D-Audio-Amplifier-Board-with-Bluetooth-4.0-325-122

 

Now, to the crossover buisness

I found this Dayton crossover board on part express, but there is absolutely no documentation on how it fits with all the part. 

https://www.parts-express.com/Dayton-Audio-XO2W-4.5K-2-Way-Crossover-4-500-Hz-260-148

 

My theory is that it has a specific cutoff point, and then, the Tweeter's low frequency cuts off, and vice versa for the woofer, all in one board. 

 

 

 

P. S

I also plan to add a wireless charger on top, 

For that, I need a step down voltage board and the charging coil. Wiring it would be a challenge. 

 

 

[The Architect]

Oh yes, there will also be a passive radiator in the mix

[SkilledRebuilds]

Sounds like you'd be a relative fan of "DIYPerks" on Youtube. Sounds right up your alley.

https://youtube.com/c/DIYPerks

 

All the Best!

[The Architect]

Wow, 

What a video. Dude is a joy to watch.

 

it still leaves me a few things un answered. How does the crossover board work or how does it get connected? it seems Matt from DIY Perks is a very handy man able to make his own crossovers from parts. Its really not my bread butter to figure such things. If a pre assemble board is available, I'd rather use it.

[geo3]

2 hours ago, The Architect said:

Now, to the crossover buisness

I found this Dayton crossover board on part express, but there is absolutely no documentation on how it fits with all the part. 

https://www.parts-express.com/Dayton-Audio-XO2W-4.5K-2-Way-Crossover-4-500-Hz-260-148

I mean it's a crossover, it just connects to the input of the speaker and the drivers. If you look there are connection points for input and both the woofer and tweeter.

 

2 hours ago, The Architect said:

 

My theory is that it has a specific cutoff point, and then, the Tweeter's low frequency cuts off, and vice versa for the woofer, all in one board. 

Yes that's how a crossover works. It sends only low frequencies to the woofer and and highs to the tweeter. This one states that it does that split at 4500Hz

[geo3]

Since this is BT and you are starting with a digital signal you can do a digital crossover and do what is know as bi-amping. An amplifier for each the tweeter and woofer.

[geo3]

Another thing how did you come up with 4500 as a crossover point? At that point your drivers can only be 3 inches apart center to center. Which I don't think is physically possible with your chosen drivers.  A lower crossover frequency will allow you to place them a bit further. 

 

Basically you don't want the drivers more than a wavelength (of the crossover frequency) apart. Ideally less than half a wavelength. 

[H713]

First, you are unlikely to get good performance out of those generic off-the-shelf crossover boards. They're almost never a good match for the drivers you're using. Keep in mind, you can take the very best ScanSpeak / Volt / Seas drivers, costing many hundreds (or many thousands, if you use Volt radial woofers) and make a horrible sounding system (worse than anything from Best Buy) if you butcher the crossover design. It is one of the most important parts of the whole speaker design process. Here are a couple of useful sources.

 

http://www.zaphaudio.com/

http://www.troelsgravesen.dk/

Also, I highly, highly recommend discussing this over at the Parts Express forum or DiyAudio. The LTT forum probably only has a couple of people who actually know how to do this properly (but you'll get lots of opinions, whether they're useful or not), while there are a lot of really great designers over on DiyAudio who have been doing this for decades. There are some very brilliant engineers on DiyAudio, and they'll be able to help you avoid expensive mistakes. 

 

I do some speaker design projects, but my expertise is more in electronics than in acoustics, so while I'm more than happy (and qualified) to give amplifier advice, I'm not the best person to ask about the details of crossover design.

[The Architect]

DiyAudio... 

If only they would respond... 

 

They seem to hate discussions with beginners 

[H713]

30 minutes ago, The Architect said:

DiyAudio... 

If only they would respond... 

 

They seem to hate discussions with beginners 

Give it time. It's a smaller forum, so you won't get responses immediately. 

[geo3]

I would also watch this video. It won't give you answers but will give you some questions you should be considering.