[linux-audio-user] professional audio measurement with linux???

hy, i was wondering if it is possible,and usuable, to make precise pressure and frequency messurements using linux. ie. to test high-end speakers.i somehow guess so,but what do i need? can i use my mic+soundcard+alsa+somemeasurementproggi ? i am looking for an inexpensive but precise solution to test the speakers i am planning to build at home and without an oscilloscope or such equip which i could never ever afford right at the start of production. i have a decent machine with fine running sound support-i thought of maybe just pushing some pink-noise (i just believe that this is what a "rosa-rauschen" is called) to the speakers without any changes to that noise, while recording it with a pretty good mic,centered right in front of the speaker with 1m between. some tests outside and some in different rooms. then i would take some kind of snd-like proggi to view the data and form it (somehow) to a nice graph.well several nice graphs. but right now i dont think that this method would give me any reliable results,as mic amp and my sound-sys may of course have their one characteristica of sound and so may make any speaker-only data unusuable. i hope someone has some ideas for me,as i have _no_ plan whatsoever about "real" measurement-cards in linux,or if i need one at all...some rough directions please? as i dont know what a propiate software might be named i didnt even find a hint. i though found some measurement cards and drivers for em-but i couldnt even guess what to measure these would be for =). im willing to try even the most complicated stuff,as long as it wont cost that much bucks. and it would be nice if i could go on with my 2.4.9EL kernel-as my realizm-drivers only work with this flavor. mfg sonicx