I can add that every SR-158 mic that I've ever seen that CAME with a radio new, was a very good sounding, loud mic.
But I've tried a "new SR-158" mic that was being sold on eBay by themselves that did not sound good at all. Maybe somebody got hold of a load of factory 2'nds or something that had problems.
Don't by an SR 158 "new" off of eBay
Check out this lemon, brand new out of fhe box today. Came with a 2970NX series radio brand new., First sign of problem, radio goes berserk ( clicking noise from radio with TX on lcd lit ) with mic connecfed but no issue with no mic connecfed.
Further inspection showed the plug didnt have a screw and was almost hanging out, opened UpTo see if any solders or shorts were present, lo and behold red wire copper strand stray touching blue wire and some other piss poor soldering arrangements with bare wires pussy galore. Hopefully didnt trash the rig.
This was a radio that was sold as brand new. However from what I have learned recently, it would appear that some radios come out from the factory a dud, and need to be put in working order prior to shipping, lets not forgot the N2 version and the juice it drew, I have my doubts about that issue being fixed on the N4 also, since even on the low power setting the LCD display dims on the radio itself as the relay clicks into TX mode. Connected directly via 8 guage wire ( 4.5 feet length ) to battery terminals. Lets be honest, the quality of workmanship aint there anymore, pay peanuts to your workers and guess what? You get monkeys.Must be a Copper or H&Y special. Always buy a radio from a place that does good tech work. This way they check everything over then tune and convert the radio one time and it's done.