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Old 3rd December 2014, 05:31 PM   #1
Jamh is offline Jamh  United States
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Default Portable mpd player

So I was looking at this overpriced exercise in design:

BeoPlay A2

and I was thinking wouldn't it make sense to build such a thing with a built in mpd player? You may control it via an LCD panel, or even better, from an old phone built into the unit to act as head. An SSD drive could contain a nice FLAC collection.

Then I was thinking of the components needed:
1. Old phone to run the mpd or volumio client. An alternative might be a screen on Beaglebone or rasberry.
2. A rasberry b+ or BBB with I2S
3. The IQ audio or similar I2S DAC
4. A LiFeO lithium battery
5. A power sipping class D amp of some sort, TPA311?
6. The biggest, most efficient speakers that could fit in the enclosure.

Although size is not really an issue (think of the old boom boxes in the Bronx!), it would be nice to make it as small as possible.

Finally, price-wise, it needs to beat the B&O by a mile.

What do you all think?

Last edited by Jamh; 3rd December 2014 at 05:42 PM.
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Old 3rd December 2014, 05:58 PM   #2
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You can't beat it when you're within the same space limits
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Old 3rd December 2014, 06:41 PM   #3
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Jamh I like your idea and that BeoPlay A2 looks intresting but yeah way overpriced tho there is something to be said about the RND that goes into things like that.

I am actually just embarking on making a Sonos Play:1 type speaker. I just want a nice mono portable speaker.
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Old 3rd December 2014, 06:46 PM   #4
Jamh is offline Jamh  United States
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Quote:
Originally Posted by lutkeveld View Post
You can't beat it when you're within the same space limits
Agreed. It doesn't have to be as small, just as small as can be made. After all, we're adding a head, a player and storage. Frankly, I would happily sacrify size for sound quality (larger and more efficient speakers).
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Old 3rd December 2014, 06:48 PM   #5
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5 liters and up is where DIY starts to get interesting. <3 liter takes a lot of DSP'ing, custom drivers/PR's, custom PCB's and careful designing. Can be done, but probably will cost you in the neighbourhood of what a premade one costs. Will be a nice challenge

Look at the Boominator Micro for example. I'm in the progress of designing a project inspired by the Micro, trading SPL for bass extension. As I'm still learning a lot everyday, it might take a while.
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Old 3rd December 2014, 06:49 PM   #6
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Quote:
Originally Posted by Jamh View Post
Agreed. It doesn't have to be as small, just as small as can be made. After all, we're adding a head, a player and storage. Frankly, I would happily sacrify size for sound quality (larger and more efficient speakers).
Your going into the exact debate I had the last couple of days, what size/form factor would be appropriate. 4 inch woofer vs 5 1/4" woofer etc.

Like you could build the cabinet for your speakers and can get more low end but go with a smaller woofer etc.

Write your self a list of pros and cons and I would say pick you your speakers first that pretty much decides the rest of the components.
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Old 3rd December 2014, 06:49 PM   #7
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Quote:
Originally Posted by Jamh View Post
Agreed. It doesn't have to be as small, just as small as can be made. After all, we're adding a head, a player and storage. Frankly, I would happily sacrify size for sound quality (larger and more efficient speakers).
A Boominator MINI perhaps?
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Old 3rd December 2014, 07:01 PM   #8
Jamh is offline Jamh  United States
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Originally Posted by Saturnus View Post
A Boominator MINI perhaps?
Right, but notice the title of the thread. Why an mpd player vs say a Bluetooth connected phone? Much higher quality sound for one thing. Also FLAC or high resolution audio files, which are large and would overwhelm Bluetooth. If you connect a dedicated FLAC player then you lose the ability to remotely control the player and you are limited in your collection.

Last edited by Jamh; 3rd December 2014 at 07:05 PM.
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Old 3rd December 2014, 07:10 PM   #9
JMFahey is offline JMFahey  Argentina
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Quote:
Originally Posted by Jamh View Post
So I was looking at this overpriced exercise in design:

BeoPlay A2
Overpriced?

349 MSRP


Can you do something this high Tech, same specs, for less?
Very much doubt so.

Quote:
and I was thinking wouldn't it make sense to build such a thing with a built in mpd player? You may control it via an LCD panel, or even better, from an old phone built into the unit to act as head. An SSD drive could contain a nice FLAC collection.
Why?
You have all that in your phone, which streams it vie Bluetooth to the Beoplay for reproduction.
Why duplicate`stuff you already have?

Quote:
Then I was thinking of the components needed:
1. Old phone to run the mpd or volumio client.
It's meant to be used with .... errrrrrr ...... your new phone?
Why also carry an old one?

Quote:
An alternative might be a screen on Beaglebone or rasberry.
2. A rasberry b+ or BBB with I2S
3. The IQ audio or similar I2S DAC
You are already carrying the functional equivalent.

Quote:
4. A LiFeO lithium battery
It already has that or better.

Quote:
5. A power sipping class D amp of some sort, TPA311?
It already has that or better.

Quote:
6. The biggest, most efficient speakers that could fit in the enclosure.
It already has that or better.

Quote:
Although size is not really an issue (think of the old boom boxes in the Bronx!), it would be nice to make it as small as possible.
I think it already is ... while keeping that sound.

Quote:
Finally, price-wise, it needs to beat the B&O by a mile.
A very difficult task.

Quote:
What do you all think?
See above.
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Old 3rd December 2014, 07:17 PM   #10
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You're telling me that you'd be able to tell the difference between 384kbps MP3 compressed file which is the current state-of-the-art for bluetooth audio streaming and FLAC on a set of $20 speakers in a 3-5 liter box?

Bluetooth audio is in fact excellent quality. That there are next to no products that properly exploit it yet is not the fault of the codec. Bluecore5 chips even have the possibility of digital output if you want to supply your own DAC or have an amplifier with digital input.

Last edited by Saturnus; 3rd December 2014 at 07:33 PM.
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