Good Stereo Speakers for outside use during BBQs, evening pot luck dinners etc

Forgot to add that I would try 12ga in-wall speaker wire from monoprice. A 100ft roll can be had for <$60 I believe. Otherwise maybe the Canare 4S11 which I use, not for your length however. Canare is ~3X the cost of the Monoprice.

Check out these new portable line array systems from electro-voice.  

https://products.electrovoice.com/na/en/30m/

https://products.electrovoice.com/na/en/evolve-50/

They sound great. Are powered and easy to transport.  Have built in bluetooth and dsp.  Just one stack should be more then enough volume.  The clarity on the mids and highs are so much better with these line arrays compared to horn loaded compression drivers most PA speakers use.

Get a pair of Used Mackire Srm 450’s.  Mount them on the adjustable pole mounts with the 3 legs...

The pole on the stand is height adjustable and you can lift the speakers up high so that the sound isn’t blocked by people standing in front of the speakers.  They have a horn waveguide on the tweeter and therefore a very wide dispersion pattern.

buy something like a parasound z dac; something with balanced outputs.  Plug an i phone or ipad into the zdac streaming soundcloud or spotify or tidal, whatever.  Plug the z dac into the speakers with xlr cables.  All in, speakers, dac, stands, i pad, you will spend $1500 but will have a system worthy of a serious dance party!

Tci rock speakers are best...10 years and going strong...

Seriously, check out some Cerwin Vega speakers in the XLS line.  Absolutely voiced perfectly for outdoor situations like you are describing.  I’ve  had an older set of the dual 15” models for years and they absolutely rock outside for parties and surprisingly smooth and subdued when played quietly.