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Halfinator Build - For sale - 28/2

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roopes View Drop Down
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Post Options Post Options   Thanks (0) Thanks(0)   Quote roopes Quote  Post ReplyReply Direct Link To This Post Posted: 11 February 2016 at 1:56pm
Originally posted by lutkeveld lutkeveld wrote:

Did you already fix your MaxAmp problem?
Good rule of thumb for playtime with a MaxAmp on a 12v lead acid battery in hours is:
Maximum volume: Ah*2
Normal volume: Ah * 8




The problem is not yet fixed, but accusafe sent me a new amplifier that im going to test out.

And if u want to calculate other amplifiers other than maxamp? is there a way to do that?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote lutkeveld Quote  Post ReplyReply Direct Link To This Post Posted: 11 February 2016 at 3:55pm
There are a lot of factors to consider:
-Battery type (voltage, max discharge %)
-Amplifier (idle current, max output)
-Volume (how loud you're playing)
-Power usage external components (BT modules, voltage regulators)
-Type of music that is played (mainly crest factor)

There is no one easy formula unfortunately. I'll explain how each factor affects playtime:
-Battery type: higher voltage results in higher idle loss, but allows for higher max output power (which in turn causes higher power draw at max volume)
-Amplifier: on low to medium levels (<1W) idle current dominates the equation.
-External components: things like DC DC converters, USB chargers etc consume quite a lot of power compared to an amplifier
-Type of music: low crest factor (lower average to peak difference) results in higher power draw, clipping can lower the musics natural crestfactor.

As a rule of thumb formula (only amplifier, no significant external power users):
High volume: Useable battery capacity in Wh divided by (total max output / 8)
Low volume: Useable battery capacity divided by amplifier idle power
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Post Options Post Options   Thanks (0) Thanks(0)   Quote roopes Quote  Post ReplyReply Direct Link To This Post Posted: 11 February 2016 at 4:46pm
Originally posted by lutkeveld lutkeveld wrote:

There are a lot of factors to consider:
-Battery type (voltage, max discharge %)
-Amplifier (idle current, max output)
-Volume (how loud you're playing)
-Power usage external components (BT modules, voltage regulators)
-Type of music that is played (mainly crest factor)

There is no one easy formula unfortunately. I'll explain how each factor affects playtime:
-Battery type: higher voltage results in higher idle loss, but allows for higher max output power (which in turn causes higher power draw at max volume)
-Amplifier: on low to medium levels (<1W) idle current dominates the equation.
-External components: things like DC DC converters, USB chargers etc consume quite a lot of power compared to an amplifier
-Type of music: low crest factor (lower average to peak difference) results in higher power draw, clipping can lower the musics natural crestfactor.

As a rule of thumb formula (only amplifier, no significant external power users):
High volume: Useable battery capacity in Wh divided by (total max output / 8)
Low volume: Useable battery capacity divided by amplifier idle power


Thanks for a good answer!
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Post Options Post Options   Thanks (0) Thanks(0)   Quote roopes Quote  Post ReplyReply Direct Link To This Post Posted: 16 February 2016 at 8:01am
Update 2016-02-16 see first post
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Post Options Post Options   Thanks (0) Thanks(0)   Quote roopes Quote  Post ReplyReply Direct Link To This Post Posted: 17 February 2016 at 8:27pm
At 80% volume on my iphone 6s the sound is starting to become crap, is this normal?
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ganon Quote  Post ReplyReply Direct Link To This Post Posted: 18 February 2016 at 7:46am
Yes. The Iphone has it's max output just around there. The last three-four dots are an over output.
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Post Options Post Options   Thanks (0) Thanks(0)   Quote roopes Quote  Post ReplyReply Direct Link To This Post Posted: 18 February 2016 at 7:47am
Thanks Ganon! Then it's all good, and it sounds fantastic for being a portable 270$ homemade speaker! 
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Post Options Post Options   Thanks (0) Thanks(0)   Quote roopes Quote  Post ReplyReply Direct Link To This Post Posted: 19 February 2016 at 1:48pm
Im interested in building a full boominator, so if anyone wants to buy a halfinator then this is for sale. 

Located in Sweden
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ganon Quote  Post ReplyReply Direct Link To This Post Posted: 19 February 2016 at 6:47pm
What about building one more Halfinator and use some Locks/Henges/butterflylocks, to connect them, so that you have a boominator that can be split up to a Halfinator.
Then it's possible to use them as monitors or only have a halfinator with you, if its only needed. :)
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Post Options Post Options   Thanks (0) Thanks(0)   Quote roopes Quote  Post ReplyReply Direct Link To This Post Posted: 19 February 2016 at 6:48pm
Originally posted by Ganon Ganon wrote:

What about building one more Halfinator and use some Locks/Henges/butterflylocks, to connect them, so that you have a boominator that can be split up to a Halfinator.
Then it's possible to use them as monitors or only have a halfinator with you, if its only needed. :)


Yea thats a good idea actually! I already have the wood cut up for one more halfinator

Edited by roopes - 19 February 2016 at 6:53pm
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Post Options Post Options   Thanks (0) Thanks(0)   Quote Ganon Quote  Post ReplyReply Direct Link To This Post Posted: 19 February 2016 at 6:57pm
I am planning to make build like that, a Multinator. :P
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Post Options Post Options   Thanks (0) Thanks(0)   Quote lutkeveld Quote  Post ReplyReply Direct Link To This Post Posted: 19 February 2016 at 7:06pm
Or you could upgrade the battery/amplifier. A 24V the Halfinator will be as loud as the full-size on 12V.

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