Alphanso PA 90 is a standard PA speaker pair suitable for home environment. recommended room size 200sqf. This stereo pair is incredible for home practice, watch movies or listening music. Passive crossover is well tuned at 2.1 kHz and can save internal speaker from unexpected frequencies. These are lightweight series and capable of handling sufficiant power to thier sizes. PA90 has a 8 inch speaker in both cabinets and 1 inch piezo tweeter. 1/2 inch voice coil inside woofer with 3 inch magnet is good enough to shake the 8 inch woofer. Crossover frequency can be tweak a bit by changing  the capacitor inside, but not recommended for non-professional. Alphanso PA90 has been designed for the modern world. This one is able to handle upto 90 watt (45w+45w) which is enoufh for personal room. PA90 can be great for vocal signal, keyboard player or electric drums player, but not recommended for guitar players.. Your instrument response would be very bassy and clear treble.