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Portable Battery 2 way speaker

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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: 11 April 2022 at 10:16pm
Haha cool will do man! And cheers for all your help so far!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lucasdude Quote  Post ReplyReply Direct Link To This Post Posted: 11 April 2022 at 10:07pm
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 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: 11 April 2022 at 10:02pm
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lucasdude Quote  Post ReplyReply Direct Link To This Post Posted: 11 April 2022 at 9:40pm
If it's black, thin and tacky inside I'm sure it's similar stuff. What camper do you have?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jack1991 Quote  Post ReplyReply Direct Link To This Post Posted: 11 April 2022 at 9:37pm
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lucasdude Quote  Post ReplyReply Direct Link To This Post Posted: 11 April 2022 at 9:25pm
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 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: 11 April 2022 at 9:17pm
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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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lucasdude Quote  Post ReplyReply Direct Link To This Post Posted: 11 April 2022 at 9:11pm
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 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: 11 April 2022 at 9:03pm
Cool ok yeh ill try that then. This is the stuff i got, is this ok to use for it, or is bitumen better to use? I have never heard of bitumen being used before.

Also is it worth covering the whole panel or just sections? I know i need to not put any covering the port at all.



Yes i sealed all the joints with CT1


Edited by Jack1991 - 11 April 2022 at 9:04pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lucasdude Quote  Post ReplyReply Direct Link To This Post Posted: 11 April 2022 at 8:58pm
In such a small enclosure it will make a big difference. Imho, the rear panel will be the first to treat. The "woodiness" of lower vocals is what needs to be addressed. The only problem is that bass response will suffer if you put too much in.
  Make sure you keep it away from the port entrance though. If it were me, I would still consider some bitumen panels. Wickes sells various sizes under "roof flashing". You can check the difference it makes just by feeling the panels at different frequencies. That's also a good way to check all the panels are sealed correctly. Did you use anything to seal the inside joints?


Edited by Lucasdude - 11 April 2022 at 9:02pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Jack1991 Quote  Post ReplyReply Direct Link To This Post Posted: 11 April 2022 at 8:45pm
Originally posted by Lucasdude Lucasdude wrote:

I didn't see any damping in the main chamber of your speaker. I would suggest you use something. On that design, maybe just 5 small bitumen panels would do it. The only downside is a bit more weight, but I think the result would justify it.

I havent fitted anything yet but i have here some 'medium wadding' from blue aran, its what i bought to use in here. Would that be ok? If so what walls would be best to do?


Edited by Jack1991 - 11 April 2022 at 8:45pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Lucasdude Quote  Post ReplyReply Direct Link To This Post Posted: 11 April 2022 at 8:40pm
Originally posted by Jack1991 Jack1991 wrote:

Originally posted by Lucasdude Lucasdude wrote:

No, using one half of each board is effectively the same as using the whole board of one.
  In addition to splitting the frequency band, the crossover may also resist one part to balance the end frequency response of the drivers. The purest dividing network is probably just a single capacitor in series with the the HF to ensure it doesn't handle any low frequencies.
  Cheap components on a passive crossover sound poor, and using too much resistance to balance drivers will certainly rob available amp power.

Oh ok would it be better to just do away with the passive crossover and fit a capacitor in series?

If so happens to the woofer though to stop it playing too much highs?

I don't know if that would work for you. If you go the biamp route, and are able to balance the channels as we discussed then it might, but to make that sound right you would have to take measurements of the bass driver response with a full range signal. Then note the roll off rate and work out the type of HPF the tweeter would need. A single series capacitor would only provide a 1st order slope, so that may or may not be ideal.
  Having said all that, it's all good fun!
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