ive used amcron(crown u.s.a) in the 80's powerbase 1 and 2... matched with JBL g-series loud speakers
crown mt's in the 90's... matched with my COMMUNITYs
qsc mx and ex series... matched with my TURBOSOUNDs
crest audio fa series.. matched with my cerwin-vega PRO SPEAKERS
and my last purchase was Lab gruppens... matched with my JBL 4892 arrays
in terms of SOUND QUALITY, id go for Crest audio (torroidal) (ang dami ng imitations nito sa raon)
sirain kasi crown and amcron, and its so heavy EI CORE pa kasi mga transformers nito dati...
ewan ko lang sa mga series nowadays kung matibay na...
QSC reverse polarity ang inputs, puro init pa...
as for the lab gruppens, it is so thin and lightweight... but powerfull...
tried mix matchin the speakers with the amps...
di ko talaga gusto tunog ng QSC...
there are alot of generic wannabe "POWER AMPS" nowadays... kaya ingat sa pagbili..
i started 1987 as a professional sound system...
konti pa lang ang reliable branded manufacturers that time..
and walang mura nun... =)