Diy portable. Bluetooth receiver with dsp?

[OldGermanHeaps]

I have a bose 802 mk2 from a stripout, And I fancied turning it into a bluetooth boombox.
These need a lot of exaggerated smiley face EQ to sound good but when properly driven they sound great. I have seen one done already on youtube but it was 3 years ago and they used a lot of discrete modules, I am hoping there is something a bit more integrated I could use now.
There are 8 0.9 ohm full range drivers in a box ported for 50hz resonance.
Is there a battery operated bluetooth rx /amp with programmable dsp, or maybe a 2 module solution like bluetooth/dsp then an amp, or bluetooth rx then amp/dsp combo?
Somewhere in my shed I have a JBL MS8, maybe I could add a bluetooth rx to that, I cant remember if it would be any good for this. It sounded good in my active 3 way setup in a couple of older cars.
Would it make sense to add an 8 inch sub into the same enclosure on the top flat area?
Can anyone recommend a forum where I might be able to get advice on this?

[Lucid_AV]

Are you really sure you want to make a battery powered 802? These things need a shed-load of power to sound any good, and then a shed-load more power on top to cope with the amount of EQ boost and still retain some amp headroom. Do you have a small portable nuclear reactor handy?

[OldGermanHeaps]

I have a 12v 30ah lithium battery. Usually have power on site too. Sometimes my soundcore 30w speaker isnt enough.

[OutInTheShed]

OldGermanHeaps said:

....
Can anyone recommend a forum where I might be able to get advice on this?

Lots of advice available here:
https://www.diyaudio.com/community/forums/-/list

But I'm not guaranteeing that it's all good advice!

Also here:
https://www.minidsp.com/forum/index

Is DSP the easiest way to do this?
An op-amp based filter might be an alternative?

[TonyRPH]

Whilst I admire your desire to recycle equipment like this, I suspect that by the time the project is complete, you could have bought a new, likely better device.

It's an unfortunate fact that DIY audio in the UK is not very popular and as such expensive.

[OutInTheShed]

TonyRPH said:

Whilst I admire your desire to recycle equipment like this, I suspect that by the time the project is complete, you could have bought a new, likely better device.

It's an unfortunate fact that DIY audio in the UK is not very popular and as such expensive.

Some DIY audio seems to be quite popular, resulting in quite high prices for 'spares or repairs' amp for instance.

[TonyRPH]

OutInTheShed said:

Some DIY audio seems to be quite popular, resulting in quite high prices for 'spares or repairs' amp for instance.

I buy spares or repairs amps for the transformers usually! I don't fix them.

But 'build from scratch' audio DIYers seem thin on the ground.

[OldGermanHeaps]

I already have the 802, and the jbl ms8 which is a 240w rms@2 ohms 8 channel amp with dsp built in and a 30ah battery. All sat doing nothing at the moment so no cost there. I have several 12v chargers so I can take one to jobsites where we have power, or charge it in the van.
I have bought a £12 aptx bluetooth receiver.
I found the exact eq curve bose use in their controller.
I am going to build it all at the weekend and see how it sounds, hopefully the jbl is ok with 0.9 ohms.
I will scope the outputs to keep an eye out for clipping.

20 Hz = -5 dB
30 Hz = -1 dB
40 Hz = +3 dB
60 Hz = +14 dB
100 Hz = +5 dB
200 Hz = +1 dB
600 Hz = 0 dB
800 Hz = 0 dB
1 kHz = + 1dB
2 kHz = + 4 dB
3 kHz = + 5 dB
4 kHz = + 8 dB
6 kHz = + 11 dB
10 kHz = + 15dB
15 kHz = + 17 dB

[OldGermanHeaps]

When i was raking for the ms8 i found a nobsound ns20g, which is 2x100w @4ohm with a 24v supply. I fed is from a 18v 12a milwaukee battery, connected it at 8 ohms for now into 1 channel, so its probably only getting 45w or so but it sounds deep, crisp and warm. I used an eq app on my phone. I would be happy with this if the jbl doesnt do the biz. I carry plenty milwaukee batteries in the van, and run 3 rapid chargers off the inverter.
I will need to take it apart at the weekend, all the 8 0.9 ohm drivers are wired in series. I will take 16 wires out the back so i can drive it 8 way 0.9 ohm from the jbl, or 2 way 4 ohm from the nobsound, whichever works best.
https://youtu.be/Rrk-_MRuuBA

[OldGermanHeaps]

Its amazing how much a bit of eq transforms the sound out of this thing.

[OldGermanHeaps]

Its rewired from 1x8ohm to 8x1ohm so my 8 channel amp should be able to deliver at least 240w rms. I am going to put a plate on the top and bottom and rear with 3d printed cleats so it can fit inside my milwaukee packout toolbox stack for easier transport to jobs and so it doesnt rattle about in the back of the fan, I have packout plates screwed to the floor and wall to secure my boxes, drawers, vacuum etc so it will be nice and tidy and sound a lot better than the pathetic milwaukee packout radio. I will make some brackets for the bigger battery and the bluetooth module and fit a switch and charging port.
Tried it at first on some hardcore, but it really works well with old school house, it has the proper club sound.
https://youtu.be/rKgug6EP2qk

[TonyRPH]

OldGermanHeaps said:

When i was raking for the ms8 i found a nobsound ns20g, which is 2x100w @4ohm with a 24v supply. I fed is from a 18v 12a milwaukee battery, connected it at 8 ohms for now into 1 channel, so its probably only getting 45w or so but it sounds deep, crisp and warm. I used an eq app on my phone. I would be happy with this if the jbl doesnt do the biz. I carry plenty milwaukee batteries in the van, and run 3 rapid chargers off the inverter.
I will need to take it apart at the weekend, all the 8 0.9 ohm drivers are wired in series. I will take 16 wires out the back so i can drive it 8 way 0.9 ohm from the jbl, or 2 way 4 ohm from the nobsound, whichever works best.
https://youtu.be/Rrk-_MRuuBA

Looks like an interesting project. Those Class D amps can certainly pack a punch even with a relatively low voltage PSU.

[OldGermanHeaps]

Ok, i found the wondom jab5, or dayton kabd4100 rebadged, 4x100wrms @4 ohms, bridgeable for 2.1, very powerful analog devices sigma dsp and bluetooth5. 0 aptx for under 50 quid. The problem now is my speaker keeps trying to escape. I need to somehow work out how to be a speaker trafficer and hold it against its will.
Sigmastudio is a learning curve, its amazing all the options you have to configure this to do anything.
This is it with 1 milwaukee battery, but the amp prefers 36v so I am going to fit 2 in series, finish tuning the dsp with my dayton rta mic, fit flush tweeters in the front and mount the amp inside the speakers then fit milwaukee packout cleats top amd bottom to integrate it into my rolling modular packout toolbox system to make the jobsite radio milwaukee should have built instead of the fairy nobass weedy hollow sounding piece of st they charge hundreds for.
https://youtu.be/96qg7iIJ3L8