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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: 11 April 2022 at 8:35pm
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.
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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 8:31pm
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?


Edited by Jack1991 - 11 April 2022 at 8:31pm
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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 8:30pm
On one of my battery projects recently, I used a 4 channel high quality car amp to actively biamp a small pair of speakers. Because  car audio is used to such things, it was easy to put a low pass on 2 channels and a high pass on the other 2. The amp also had a variable subsonic high pass, so I can use that in the same way we discussed to stop the system robbing power due to inaudible frequencies.
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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 8:20pm
Oh cool that makes sense then.

Just reading about biamping now and sounds like you get a nicer clearer sound and deeper bass.
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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 8:19pm
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.


Edited by Lucasdude - 11 April 2022 at 8:24pm
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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 8:16pm
Ah right ok cheers yeh i see what you mean now.

And yes i do have another exact crossover. I wasnt planning on using it but will consider it now. As long as there will be enough room inside to fit it ill do it.

My only concern is that passive crossovers eat battery power i have heard, so having 2 in there would make battery power worse wouldnt it?


Edited by Jack1991 - 11 April 2022 at 8:17pm
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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: 11 April 2022 at 8:12pm
In your case it would be passive biamping, so picture 2. The "X" at the input of each driver denotes "crossover". In picture 3, the X is before the amps so that is active biamping.
  Yes, on your mono system you can treat each amp channel as a separate amp.
  If you have 2 identical 2 way boards, just use one for each amp channel connected to the relevant driver.


Edited by Lucasdude - 11 April 2022 at 8:14pm
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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 8:08pm
Ok cool yeh i just googled and i partly understand now here is 1 photo which i assume is what you meant.

I would be wiring it like the first photo. But it sounds like your saying to wire it like the bottom photo? Amplifier 1 and Amplifier 2 being just each channel i assume too?




Edited by Jack1991 - 11 April 2022 at 8:10pm
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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: 11 April 2022 at 7:59pm
Just another thought on that. I assume you have another identical one of those crossovers? If so, you may aswell try the same thing but use a separate board for each driver.
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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 7:29pm
I won't try and explain how you might go about it as I don't want you to damage anything. If you are interested then you'll find some help online. If you do proceed and use Poweramp summed to mono, you will be able to control the level to each driver using the "balance" control in the app. This might also help if the drivers you are using aren't the spec that the crossover was designed for.
  incidentally, I did notice that one of those Convair 2.5k crossovers needs to have the HF polarity reversed, so that might be something to try at some point.


Edited by Lucasdude - 11 April 2022 at 7:31pm
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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 6:48pm
Ah right ok cool how would i go about that i dont really understand?

I thought 1 channel of the amplifier goes to the 'IN' on the crossover and there wasnt any other way round i could do it?

Also there are no gain controls, would that not mean i would be getting too much power to the highs?


Edited by Jack1991 - 11 April 2022 at 7:20pm
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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 6:33pm
It's not difficult to work out watts watt on that board. It won't gain you much, but driving the 2 halves of the network with a channel each might mean less chance of HF driver damage due to clipping, and might sound a bit better.
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