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Portable Battery 2 way speaker

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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 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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Jack1991 View Drop Down
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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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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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Jack1991 View Drop Down
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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: 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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Jack1991 View Drop Down
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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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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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Jack1991 View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jack1991 Quote  Post ReplyReply Direct Link To This Post 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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