I should probably have mentioned what the speaker will be used for to better understand the concept.

My friends and I have always enjoyed the Bristol rave scene and the general big sound system setup. We have access to land where we can camp out and really turn the speakers up without disrupting any neighbours/locals. This started off with a small Bose Bluetooth speaker and has eventually worked its way up to 5 Minirigs and 2 Minirig subs between our group.

However, were looking for the next level up.

We wanted to create almost one section of a tradition large “soundsystem” we thought the folded horn/ scoop may be too large so ported would be a better option? We have access to a large car, small van, large gardening trolley and a team of friends, hence why transport/weight isn’t a top priority. However, as its never a huge group we don’t have the need for a full sound system. We just want something that can get loud and really pump the low ends/base. 

Ideally using battery power on a 12v system opposed to having to bring a generator too and all the complexities which come with it.

Having read this, any updated advice on speaker combinations (size/number of drivers) size of amplifiers in combination speakers and batteries would be great.

As my understanding is so far from the comments a far more powerful amplifier is needed? Should i still aim to use a class D?

Studio45 you mention the GM-A5702 this looks like a good option, however as you mention it is not a class d but in fact an A/B I believe. What are your thoughts on the Pioneer GM-D8604 ? This is a 4 channel, bridgeable class D amplifier with 4x100w rms at 4 Ω

 Or 4x150w rms at 2 Ω. I feel I still may need to go bigger?

Thanks for the recommendation of Sure Electronics (aka Wondom) I will certainly look into this, as well as the hobbyking batteries!

And I will aim to ensure that speaker sensitivity is above 90db. Don’t want any of that rubber chicken!

Carlosdelondres Thanks for the advice, that makes a lot of sense, I will look into some different PA drivers instead. As for batteries, noted not to drop below 50% thanks, will look more into the lipo however I found the price is waaayyyy above the alternatives.

A tracer LiFePO4 battrey pack costing £370 for 12v 24ah while some deep cycle batteries I was looking at were around £120 for 100ah, however I understand they are not meant to be fully discharged are larger/ heavier and I may need more of them. But surely a 100ah deep cycle battery, not dropping below 50%, will still give more juice than a 24ah liop?

18650 battery build sounds interesting, will make sure to read up.

Hemisphere – Hi, thanks for your help!

For transport we have use of a very large car where the back seats can be folded down, a small van, a heavy-duty garden trolley and several friends. So between us should be able to move it to the locations we have in mind.

Horns are a good idea, when I looked into tweeters the research I found said a bullet tweeter would be louder that a tweeter in a horn, what are your thoughts on this? 

Will look more into horns, hybrids and the cubo series, thanks.

You mention needing more along the lines of a 500w amp for the sub alone. Running off a 12v system I believe I would need around 42A to run the sub alone for an hour, would this mean I would need several large batteries?

Great advice on the Fane 12" 12-250tc, I will look into these. It would make a lot of sense to avoid making the system too complicated. As I understand the frequency range for this speaker is 45Hz – 17kHz and with a likely curve at each end would this mean that I don’t get high enough highs and low enough lows without a sub and tweeter anyway? Or would this not be an issue?

Originally, I wanted a 15” driver however I could only find ones with pretty low sensitivity ratings, which for efficiency is an important factor. Any recommendations or advice?

And please do try and convince me, you know a lot more than I do. What would you recommend instead of 35hz?

Also, do you have thoughts on a sealed sub? A lot smaller but I believe you loose on volume and efficiency.

Note taken not to limit amp power.

As for batteries, would a Tracer 12v 24Ah LiFePO4 battery be my best option? I believe this is the highest Ah battery they do before going into the mega expensive cases. Or a couple of the 10AH lithium packs.

I feel this would not be powerful enough?

Note taken that active crossover is a must. And to avoid external active crossover units if possible

As for the amp I specified I believe on the back it had two options for HPF and LPF one for the “front filter” and one for the “back filter”. I guess “front filter” means front speakers referring to two of the four channel outputs, and same for the "back filter"?

I will certainly do more research into amps mentioned, and more into coaxial/full range drivers.

And if I did go down the route of passive crossing from mids to highs I would likely seek the help of a local professional, if I’m going to invest in something I wouldn’t want to muck it up.

Again, thanks for all the advice everyone!!

I would also appreciate any more short theoretical examples of a complete set up, even if your own interpretation, to help me understand the power side of things better. Ie with a 12v 24ah battery you could power a 800w class d amp with 4 channels, with this much power going to these speakers which are this powerful ect. 

Thanks!!!