A few tips from a LOOOONG time trance fan. I traveled thousands of miles anualy to go to the WMC in miami. Look up winter music conference if you want more info. Along with the raves and night scene for years. I got lucky and learned early... The higher the hz the worse it is for you.. Bass will be much less detromental to your hearing. Be carefull of loud shrill tones, horn PA speakers are a nightmare on your ears. Also really crappy headphones will destroy your ear via distortion and amplification of mid-highs.
Anyway some advice for going out.... wear earplugs that are solid. the kind with the "tunable" holes in the middle... not a good idea much sound can travel through it, and to me, it all sounds like just extreme high pitch sound. Something else nice about plugs ( I actualy like cheep standard blaze orange plugs for shooting or for construction ) is you will understand people talking to you better.. i don't know why. You will have a much better experience with Bass, emotional almost if the system is equiped and as you said.. with trance, it's all about the bass creating a feeling in you. High SPL with bass in a setting built for many people and frequesntly outside( raves and goa parties etc ) open air = bad bass SPL, so they crank it up and distortion is abound. Earplugs can help filter that greatly. your ears will remain less stressed, and background noise will be minimal.
Also, a little info on that ringing and why highs and such can';t be heard... from my understanding most of this is due to a muscle in the ear from harsh sounds... It should always go back within a day, usualy less for me. I am not sure on this correct me if I am wrong, it's how I understood this phenominon.
I never have the ringing anymore and I protect my ears with everything I do. I ride my bike with my headphones in,(shues e3's at the moment) and I can hear cars and surrounings much better with no pain from the revving engine and exhaust and other road noise. I plug and muff at the range and even use headphones when i do yardwork. Mine cut almost 20 DB from the top and I can listen to music while doing lawn maintenance and not worry about the headache from the mower that I would normaly have after words.
I would highly recomend you not to use the foam peice from your earbuds without the drivers also... that small hole there will let allot of noise... maybe try it at home before you go out and crank the tunes... I find it filters out the music and lets only high pitches and distortion in... just my .02
Good luck, and I've never heard of classic mushroom, I will have to give it a listen.
Thanks.