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Portable Battery 2 way speaker

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Jack1991 View Drop Down
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    Posted: 30 May 2022 at 7:36pm
Took it down the field on Friday just gone, with a few mates and we had it on about 1/2 volume for a couple hours, then about 3/4 volume for a further couple hours and it proper pumps! Im well happy with it. The voltage only dropped from 20.4 to 20.2 in that whole time aswell, so i rekon it would last ages on 1 battery. That was 1x brand new 18v makita li-on 5ah battery.

On the poweramp app i was fiddling around with it for ages, but find it just sounds nicest with the bass knob set to 60% and the treble to 25%.
However as i increase the volume to around 3/4, the bass then needs to be reduced to around 40% or it starts to distort, but doing so didnt make it less bassy just kept it from distorting, if that makes sense.

Now i have heard it 'empty' although im happy with the sound i like to experiment anyway so i will try adding in some sound deadening on the 5 panels like Lucasdude suggested. And i will add on top in the centre of 3 opposing panels a bit of dacron dampening. And see how it sound with that.


Edited by Jack1991 - 30 May 2022 at 7:39pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jack1991 Quote  Post ReplyReply Direct Link To This Post Posted: 08 May 2022 at 6:40pm
Any reccomendations for the frequency sweeps? Ive been reading up to try and answer this myself but im still not 100% sure.

Im assuming Linear and Sine Wave. But not sure on sweep time?

Hoping to have a play this evening or 1 evening this week, once the other noises die down in my garden and neighbours.

Also i fitted a volt meter this weekend too. To keep an eye on the battery levels. Have been told 15v is the lowest you should let a 18v lithium Makita battery get to before it will ruin it. Weirdly a fully charged 18v makota battery is 20.4v



Edited by Jack1991 - 30 May 2022 at 7:37pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jack1991 Quote  Post ReplyReply Direct Link To This Post Posted: 02 May 2022 at 12:32pm
Cool thanks man i will try them out soon. Do you just do it outside 1m away and with the speaker and phone on the floor?

Also what is the main aim for a frequency response curve, i assume its just to get rid of peaks and dips and to get as flat a line as possible?


Edited by Jack1991 - 02 May 2022 at 4:51pm
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Lucasdude View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lucasdude Quote  Post ReplyReply Direct Link To This Post Posted: 30 April 2022 at 12:34am
For Android, I have Frequency Sound Generator, and Sound Meter. Where Apple scores points over Android is their control of both hardware and software, but that's still no reason for me to use them. There are fairly large differences in the audio performance of Android phones, so I would suggest you use the best quality ones you can and also use the same brand. I've used Samsung Galaxy and A series for the last 10 years or so, and they test very well for line output.


Edited by Lucasdude - 30 April 2022 at 12:35am
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jack1991 Quote  Post ReplyReply Direct Link To This Post Posted: 29 April 2022 at 9:46pm
Thats not a bad idea. As im not super audiophile so im reluctant to fork out for a umik-1 mic to maybe not fully understand it to get the most out of it. But would like to be able to eq it nicely.

What spl meter app and tone generator app do you use please? Does it show a frequency response line too?


Edited by Jack1991 - 29 April 2022 at 9:52pm
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Lucasdude View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lucasdude Quote  Post ReplyReply Direct Link To This Post Posted: 29 April 2022 at 9:33pm
I've never found anywhere quiet enough to do any serious measurements outside. However, with 2 smart phones and a tone generator app on one, spl meter on t'other, I've managed to lose a few solitary hours!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jack1991 Quote  Post ReplyReply Direct Link To This Post Posted: 29 April 2022 at 6:46pm
Cheers man! Yeh swaps the same as if it was on a tool, its attached to 1 of these in photo.



Haha that would be pretty cool solar charging it. Way beyond my knowledge at the moment though.

One thing someone said on another forum was i should fit a 'low voltage cut off relay' so the battery cuts out at 15v minimum or it can damage them permanently and wont recharge. Or to just keep an eye on the voltage. So bought a little voltmeter the one in the photo. Id rather that as im interested in seeing how long it lasts, with different styles of music, so be good to actually see the voltage itself. Waiting for it to arrive to fit it next week. Its only small around 3cm.



That poweramp app is really good too! I like the parametric eq bit. Although im not 100% sure on what to change so have just been having a play around with it and seeing what sounds good. I think if i had a measurement microhphone it might be better so i can actually see what frequencies need changing. Although i havent done that before so would be a bit of playing around with that. As im not actually sure what i am aiming for with EQ'ing, is it that the freqeuency line should be as flat as possible?


Edited by Jack1991 - 29 April 2022 at 6:50pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lucasdude Quote  Post ReplyReply Direct Link To This Post Posted: 29 April 2022 at 6:32pm
Looking good! Can you swap out the battery easily? Maybe you could rig up some sort of charger using one of those small camping solar panels? I've heard good things about Anker ones, but charging 18v will be a challenge!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jack1991 Quote  Post ReplyReply Direct Link To This Post Posted: 28 April 2022 at 6:15pm
Just finished it today well happy with it. The preamp makes such a difference. Sounds clearer and cleaner, and also louder at lower volumes.

Needs a bit of eq'ing, that poweramp app is really good, but could also do with some pointers in what best to set for it on the parameteic eq.

No idea how long the battery will last yet only tested for 15mins in the garden at half volume was loud enough with neighbours and that 😆 will take it down the field soon to give it a good blast.














Edited by Jack1991 - 28 April 2022 at 6:16pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jack1991 Quote  Post ReplyReply Direct Link To This Post Posted: 13 April 2022 at 8:13pm
Yeh i did think about the weight but not too sure i can do much about it, without it all being near the back towards the door. 

Also the door has 2 holes in which are for air flow and also for your fingers to get in to remove the door. I got no idea how hot the electronics will get but thought its best to have 2 holes for air flow? Another reason thought to keep away from the holes incase of rain or liquid getting in. Chances are low but even lower with things away from there.

But yeh completely agree with you about weight distribution.



The holes can easily be blocked off on the inside if they arent necessary.


Edited by Jack1991 - 13 April 2022 at 9:41pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lucasdude Quote  Post ReplyReply Direct Link To This Post Posted: 13 April 2022 at 8:07pm
From a practical point of view, I would pay some attention to weight distribution when it's being carried. You already have 2 heavy magnets at the front. It might be an idea to mock up all the components inside, then work out the centre of gravity before banging a couple of t-nuts in for a hand carry strap.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jack1991 Quote  Post ReplyReply Direct Link To This Post Posted: 13 April 2022 at 6:39pm
The amplifier finally arrived. Just looking at positioning now for the Amp, Preamp, Crossover, and the DC step up.

I want them fitted toward the front, on the side walls, nearest the tweeter as possible really. Just to keep it all away from peoples fingers, should someone else open it to change the battery or that. The battery holder will then be fitted in the middle nearest the door end.

Is there any downsides to that at all? With the tweeter having the big magnet on it. The tweeter will be the last thing fitted but here is a photo just to show you how it is, and so i can work out roughly how things will go.

There is about a 4cm gap between the tweeter magnet and the tallest part which is the amplifier.

Heres a photo just so you can see what i mean





Edited by Jack1991 - 13 April 2022 at 6:42pm
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