How much power can a pair of Klipsch La Scalas take ?

Am I at the point where I need to upgrade my wires? Any good brand to look for and not break the bank buying them?

All Heritage models are rated at 100 watts continuous 400 peak but they play so loud with so little power its unlikely you will be able to tolerate the volume they can produce with 50 watts.....

I have a pair of Heresy III,  40 watts will drive them plenty loud and clear.  Ridiculously loud and not really even pushing the amps.   Lascalas are much more efficient, so you wont approach your amp's max power if being  sensible with the volume control 

Don't listen higher than average of 85dB, or you'll ruin yourself. 

I am always rotating power amps through my Lascalas. My Yamaha pro amps have a red led indicator per channel that show when 1/2 watt has been reached, and it is plenty loud for me. At the level the OP is listening, there are many areas of the Lascalas that are ringing and vibrating that should be reduced by dampening. The shoutiness and harshness spoken about is caused by THIS, and not the drivers. Dynamat should be used on the metal mid horns immediately. The Klipsch forum has much information on the subject. Enjoy ! MrD.

used a stacked pair with Crown 300’s in the 80’s for a Punk/Rockkabilly band PA

pretty sure you will just hurt yourself IF you dont cliip your amps....

of course I used hearing.  protection.....