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Portable Battery 2 way speaker |
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Lucasdude ![]() Young Croc ![]() Joined: 16 March 2013 Location: London Status: Offline Points: 636 |
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In an ideal world, the vibration of the cabinet panels wouldn't contribute to the sound of the speaker. Some may call this colouring effect "character", but I don't feel the same. I'm not one for just doing stuff for the hell of it, but if I can get a small gain for a small effort and a small expense then I'm all up for it. If you use bitumen panels on all 5 (excluding the baffle), I'm very confident it will result in a better sounding speaker. Do take into consideration that adding this to all the panels will reduce the effective internal volume and therefore raise the cabinet tuning frequency. You might want to calculate the differnece before committing!
Edited by Lucasdude - 11 April 2022 at 9:15pm |
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Jack1991 ![]() Registered User ![]() Joined: 05 February 2020 Location: Bristol Status: Offline Points: 456 |
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Ah ok i see so the bitumen isnt for standing waves in the cab, they are just to stop panel rattle?
So it might be worth adding bitumen and the wadding i showed too? And yes understandable it will reduce the volume in box.
Edited by Jack1991 - 11 April 2022 at 9:19pm |
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Lucasdude ![]() Young Croc ![]() Joined: 16 March 2013 Location: London Status: Offline Points: 636 |
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Try using a tone generator app and feel each panel at various frequencies. There will be a couple of resonant peaks which, although can't really be eliminated, may be mitigated. I've found that these frequencies affect different styles of music to a greater or lesser extent. Using a tone generator can also be helpful when you apply pressure to opposing panels, as these are often the easiest to brace.
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Jack1991 ![]() Registered User ![]() Joined: 05 February 2020 Location: Bristol Status: Offline Points: 456 |
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Cool perfect cheers mate ill try these different tips this week and see how it goes.
I have been testing it using my pioneer car amplifier. Also i just remembered i have some Dodo Deadn Hex Mat leftover from my camper build. Which is litterally used to dampen vibrations. So ill try that out. Unless bitumen has better certain properties?
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Lucasdude ![]() Young Croc ![]() Joined: 16 March 2013 Location: London Status: Offline Points: 636 |
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If it's black, thin and tacky inside I'm sure it's similar stuff. What camper do you have?
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Jack1991 ![]() Registered User ![]() Joined: 05 February 2020 Location: Bristol Status: Offline Points: 456 |
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Cool its perfect stuff then.
Its only a VW Caddy Maxi. Litterally just finished it. Nothing too fancy inside just sound deadened, insulated and carpeted and altro flooring down. Keeping it basic and just using it for weekend aways and festivals.
Edited by Jack1991 - 11 April 2022 at 10:03pm |
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Lucasdude ![]() Young Croc ![]() Joined: 16 March 2013 Location: London Status: Offline Points: 636 |
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Sweet. If you see or hear an army green VW T4 dropping some basslines then say hi!
Edited by Lucasdude - 11 April 2022 at 10:23pm |
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Jack1991 ![]() Registered User ![]() Joined: 05 February 2020 Location: Bristol Status: Offline Points: 456 |
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Haha cool will do man! And cheers for all your help so far!
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Jack1991 ![]() Registered User ![]() Joined: 05 February 2020 Location: Bristol Status: Offline Points: 456 |
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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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Lucasdude ![]() Young Croc ![]() Joined: 16 March 2013 Location: London Status: Offline Points: 636 |
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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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Jack1991 ![]() Registered User ![]() Joined: 05 February 2020 Location: Bristol Status: Offline Points: 456 |
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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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Jack1991 ![]() Registered User ![]() Joined: 05 February 2020 Location: Bristol Status: Offline Points: 456 |
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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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