A2DP Speakers

A2DP Wireless Bluetooth Speakers
with a pocket PC phone

I used a broken pair or Logitech wireless stereo headsets to create my speakers with A2DP.

I really hope that manufactures of consumer electronics speed up their development and their time to market with new products. It seems they think "we are not ready to embrace really cool technology" They might think it’s too complicated for the average user, or its just time consuming and very expensive to develop new stuff, what ever the reason, I just want to be able to use what I know is feasable to make happen...

One example is Bluetooth, and Bluetooth is perhaps one of the least understood technologies out there today. Most people think it’s something in a cell phone for a headset, and it’s much more than just that. The best part of Bluetooth is its profiles and one of my favorite profiles is the audio profiles AKA: AVRCP, and A2DP

More bluetooth info

I will talk about A2DP today and show you a hack I did to create my very own Bluetooth speakers with A2DP and use a pocket PC phone to stream high quality stereo sound to my speakers.

A2DP is my preference to be the coolest profile within Bluetooth, why have manufactures not caught on is beyond me. I modified my pocket PC's registry to enable the A2DP profile, and added a driver. The registry hack can be found here  

works with the HTC wizard, ( K-Jam, T-mobile, etc, just update to the latest ROM which has the latest AKU2 ROM from Microsoft, with push email)

See the work in progress here...

1) Find speakers to destroy,  that are amplified like  ipod speakers MP3 etc., I used 50$ CA powered speakers from Staples

2) Make sure they have their own power AA or AAA batteries.

3) Take them apart and locate the wire lead to the speakers on the logic board of the speakers

4) Take your destroyed (but still functional) A2DP headphones. Logitech, ipaq, blue ant etc, and carefully take them apart, on one earpiece is the Bluetooth logic board, on the other ear piece is the battery back, the leads end up on the logic board anyway, and will be rechargeable and the battery lasts a very long time.

5) Drill a hole in back of the casing of the speakers

6) Carefully remove the speakers from the Logitech headphones and run new wires to the logic board to accommodate the connections to the logic board on the speakers

7) If you want volume control and amplification to the speakers locate the volume control on the logic board speakers and solder the 2 positive leads of the Logitech to the headphones positive speaker leads

8) Locate the negative common ground on the speaker’s logic board and solder that to the negative speaker lead of the Logitech

9) Solder the battery connections back to the Logitech board

10) Hot glue everything leave a space to be able to charge the Logitech headphone unit, remove the grills on the speakers to make it look less dinky.

Enjoy Bluetooth premium wireless music form any A2DP device.

I will update to better looking speakers just wanted to see if this would work, will hunt down Altech Lansing speakers etc, or something really nice to embed everything in the speaker box next time so it looks like a real finished product.  I do do not have the budget to make a really cool industrial design, but you get the picture...

Comments

[mimorek]

Hi! Is it able to use that Logitech headphone and control with other pda?

[Simon]

Yes, If you get the version with the next and previous track buttons from logitech, it will work, if the AVRCP profile is loaded on the pocket PC.

[Chris.J]

Hi,
Great idea with the bluetooth headphones! I built a similar bluetooth receiver from a pair of HP headphones (rebranded logitech) to use it in my car together with my iPAQ. Works great!
Have a look at my article here http://www.grynx.com/projects/bluetooth-stereo-in-the-car/

Cheers,
Chris

[Simon]

Hi Chris

Actually I had seen your article a while back, and its a natural! I was planning on referring your piece in my next project which is almost finished, I am rebuilding an entire new set of speakers with new box, and controls built in and your article has great tips and inspiration!

All the best

Simon

[tony tromp]

Excellent mod... I am already planning to get some gear this weekend.. BTW: Compared to full blowen bluetooth audio-headphones, bluetooth car-headsets are much cheaper a much cheaper option ($15-$45).. I've seen some apps which also let you stream Music to the headset profile (Windows Mobile).

[tony tromp]

I just build an Bluetooth audio interface using just a lowbudget handsfree headset, and I must say it works nicely. Instead of a fixed mounting, I used a mini-jack, so I can hook it into any stereo or car-stereo and remove it afterwards... This week I will add an input-jack, so I can add a small microphone so I can use it as a carkit too.

[Pablo]

I found realy nice what you have done! I have a I-mate Jam that I'm tring to make work with my bluetooth Headphone, but as you know the Pocket Pc from I-mate doesn't come with A2DP Profile and you said that you have change your registry on you pocket Pc and got it to work. Could help me out here?

[Robert Webbe]

I test A2DP products for my work. I have an up-to-date list of all phones on my website: http://www.robertwebbe.nl/A2DP.html

[Jerry Crockford]

Hi,

I listen to a lot of MONO podcasts from Australia's Radio National (Similar to America's NPR).

I would LOVE to find a BT mono earpiece, (as opposed to a great big lunky pair of headphones) that supports A2DP. That way, I could use Softick's Audio Gateway programme in my Treo 650.

But...

Having searched high and low, I haven't found any such earpiece.

Do you happen to know of an A2DP earpiece on the market?

Thanks,

Jerry

[Natasha]

Hey that's awesome! I wish I had the skills to do that... I want a pair of wireless earbud headphones for my iPod but Apple doesn't seem to want to make them... it doesn't seem like it'd be that hard if you knew anything about that stuff but I definitly don't! If anybody thought they could do it and either write REALLY simple directions on how to do it or even make them for me I would be eternally grateful (and pay you :) ). dolphin8582@msn.com

Love.

[Kenji]

Why isn't there a bluetooth stereo adaptor for PC's? Right now, I'm using a stereo system as my PC speakers, but I want to use them wirelessly. Does anyone know how make this Bluetooth adaptor: Stereo->RCA Output->3.5mm phone jack->SOME BLUETOOTH ADAPTOR WE NEED TO MAKE->PC Bluetooth dongle

[Kenji]

Why isn't there a bluetooth stereo adaptor for PC's? Right now, I'm using a stereo system as my PC speakers, but I want to use them wirelessly. Does anyone know how make this Bluetooth adaptor: Stereo->RCA Output->3.5mm phone jack->SOME BLUETOOTH ADAPTOR WE NEED TO MAKE->PC Bluetooth dongle

[fin212]

I love this idea can't wait till i get some bits and peices together

[steve]

Hi, would this work with a Sony Ericsson HBM-30?

please email me back

thanks

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[Tariq]

Hi! Is it difficult to modify registries to work-with/allow the A2DP profile?

I use a 17" Powerbook, and I have not been able to use the A2DP with my Sony headphones -- they work really well on my Dash, but on the Mac all I get is the low-quality audio.

Any advice? I know it is possible to buy a transmitter to plug into the headphone jack -- but what a waste!

[LarryW.Walsh]

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[ambrose]

Hi,

Good on you for making something work - a few of us were wondering why bluetooth speakers aren't out there just the other day. I am a loudspeaker designer and quite fancy the challenge of making some battery powered LS go very loud indeed... thanks

[torokilopok]

Hello

This is a beautiful site. I`ll send the link to my friends.

http://krtar.info/insertion.html


G'night

[Rodric]

Hello your projects with BT seem great, it is truly an underexplored tech. I have a question for you if you think you can find the time to answer me.
I have these Nokia BH-501 headset, it works great with my Nokia 5700 cell phone, but i wanted to use them with my PC at home. Do I need only a USB bluetooth adapter with the A2DP profile or do I need anything else? Do you recommend any adapter? Will I be able to use the mic on the headset, recognized as a mic by my PC?

[jacobroder]

Want to start your private office arms race?

I just got my own USB rocket launcher :-) Awsome thing.

Plug into your computer and you got a remote controlled office missile launcher with 360 degrees horizontal and 45 degree vertival rotation with a range of more than 6 meters - which gives you a coverage of 113 square meters round your workplace.
You can get the gadget here: http://tinyurl.com/2qul3c

Check out the video they have on the page.

Cheers

Jacob Roder

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