To my ear most of the sounds in Phoenix sound correct, except the ship's firing sound. We owned an arcade with several different phoenixes, and I spotted that discrepancy right away (stay around a phoenix for 8 hours a day for months on end and you just know the sounds). But, unsure of myself, I checked the old old phoenix.zip samples file, and sure enough the firing sound is different. To double-check, I went to the local arcade here recently, and played an actual PCB, and surely enough the shots are also different - as I remembered. Finally, here is a YouTube video demonstrating the actual sound from a PCB:
再現手順
Simply start the game and play, press fire button. Firing sound is not correct.
追加情報
To me, it sounds as if the firing sound is actually being played backwards. The actual game makes a "pock, pock, pock" sound. But MAME's sound like "whop, whop, whop". Thus, it sounds almost like it is backwards; or at least the envelope is incorrect. Found this problem in all versions of MAME going back before .78, and at least 4 different ROM dumps.
サウンド
phoenix - フェニックス (Amstar, set 1)
phoenix3 - フェニックス (T.P.N. 海賊版)