12v SLAs for 3116....series or parallel?

[jimk04]

I built an outdoor speaker with a 3 channel tpa3116.

The 4" 'sub' bottoms out quite easily. Not sure if the amp is losing control of it or whether it is more down to the enclosure volume, but for this question in the psu section of the forum we shall assume I am looking into the amp side.

It is powered by a single 12v SLA 7ah. If one were to apply another battery to the system to help control the woofer more, would I go for more current or more volts....should I series or parallel the batteries.?

Ofcourse I can easily connect up either way and test by ear, I was just interested in the technical side of it and what the amp and driver would prefer.

Thanks

 

[Yatsushiro]

I'd be careful running them in parallel, as 2 freshly charged 12v batteries provide very close to the 26v max of a TPA3116 chip.

For my outside 3116 based systems I use clone DeWalt 18v 5Ah batteries, with great success.

 

[UserAbuser]

2x12v in parallel = 12v
2x12v in series = 24v

 

[Yatsushiro]

2 x healthy 12v SLA in parallel = 12.6v
2 x healthy 12v SLA in series = 25.2v

When a 12v SLA battery is giving only 12v, it is almost fully discharged.

 

[lutkeveld]

I'd be careful running them in parallel, as 2 freshly charged 12v batteries provide very close to the 26v max of a TPA3116 chip.

I think he refers to this mistake 🙂

 

[Yatsushiro]

I think he refers to this mistake 🙂

😱

Whoops!

 

[Khron]

If the driver itself is hitting its excursion limits, no amp or supply voltage will help with that.

A 4" driver won't be able to go terribly loud, especially in the low end, to begin with.

I built an outdoor speaker with a 3 channel tpa3116.

The 4" 'sub' bottoms out quite easily.

Thanks

 

[JMFahey]

^^^^ That.

I find very hard to call a 4" speaker a "Subwoofer" by the way.

Hey!, I manufacture 4" *Tweeters* ... how´s that?