wall level+ begins at 10462.5 KJ (or 10.4625 MJ)
mid end wall level prolly starts around half of that, but i'd rather use something more concrete: a kg of TNT, which is 4.612 MJ. The mid end of this would include stuff like the rough amount of energy released by an
RPG-7's PG-7VL warhead, which contains 693.5 g of HMX, the equivalent of 1178.95 g of TNT due to
HMX's RE factor of 1.7, which would make it about 5.438 MJ in energy (Altho should be noted this is just a single stage HEAT round). Other rocket launchers should be comparable to this ballpark, but rocket launchers with 9-A warheads do exist.
Low end would still feature autocannons (Such as the GAU-8 Avenger, with a muzzle energy of over 200 KJ at minimum), sniper rifles, and the like.
Higher end Street level is pretty much dominated by guns and their other weapon friends.
Should be noted that we technically dont use a "low end", "mid end", or "high end" for tiers, we just use either the plain version (like "Solar System level") or that, with a +. Although many members, me included, do use those 3 words, we just do rough ballparks.