Running class d amps on batteries...

[Buehgemeiste]

It's an electric cargo bike with a 21" ground loaded tapped horn, double 12" midbass & turbo tops, should play up to 140 db!

edit:

I run batteries in series doing +- 72-84V (4 pcs 36V lithium) and I'm running that directly onto the amplifier rails.

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For this I run on 2 pcs hypex ucd2k, 2 pcs ucd700, 21" tapped for sub, double 12" tapped for kick, F2 res2 sh for top.

... and this is how it works.
my outdoor party machinery lacks in power.
TDA7498 and its counterparts are nice amps and suit most mobile boomboxes.
but setups like this need more power.
the op of this thread seemed to have similar problems in 2012 like i have in 2015.

i'm looking at TAS5630 modules atm.
maybe one 600W 2Ohm TAS5630 module with four 12V sla batteries for the subs (might be able to add two more in future) and one TAS5611 stereo module for mids and highs powered from five 6V sla batteries (which i already have) might be enough.
anyways this should be a step forward from what i have now
http://www.diyaudio.com/forums/class-d/277195-amping-hand-truck-pa.html

another route would be to look at IRS2092 modules like L25D.
would need more batteries, but those amps are said to be good (,too).

 

[Bob Richards]

Generating decent bass ourdoors takes a LOT of power and cone surface area. You might do well to roll off the FR going into the poweramp below about 80HZ, so you have quite a bit more power available for above 80HZ.

Also, most amp circuits need to see zero ohms when they look at the power supply for stability purposes (for AC), so they don't oscillate spuriously. I'd make sure there is a 0.1uF cap across the PS wires right at the amp circuit, if there isn't one already there.

 

[owlthathurts]

I'm having some issues with my stereos longevity and could really use some advice in the battery department. Your project sounds similar to what I've been building..

So, I'm using the Kinter MA-180(I actually like them better than the 2020). I am powering them with 3 x 18650's (3.7v 4800mAH Li-ion). These batteries sound great at full volume, bass and all, only for about 30 minutes and then fizzles out to nothing.. which sucks.

I've considered doubling them up and putting a regulator in, but is there some obvious battery(to you that are more knowledgeable) that I should be using and just don't know about?

Thanks for any advice!

P.S. If someone could explain or provide a link on how to wire up and charge the batteries without removing them, that would be stellar!😀

The amp idles at 90mah and begins to clip audibly at 4000mah.
A customer has one my ammoblasters and plays electronic dance music at full volume through 2ohm polk 6x9 speakers. His experience is that a 12v7ah sla battery will last three hours and the 19.2v4ah lithium ion battery will last six hours. He just plays his full blast until the music stops. Only issue is that he cooks the .250 faston connectors every few months and they need to be replaced.
I try to swap batteries before they are more than 70% discharged. Which is six hours on average. The sound quality and quantity is startling.
I find the sla batteries provide more heft in the bass range and the lithium ion batteries provide more punch everywhere. With or without extra stiffening capacitors.