Input Gain / Subsonic Filter

[osamio]

Sweet, sounds good, thanks a lot for the help.

Unrelated question: (doesn't really deserve its own thread) Is there a way to measure dB's at home?

Theres quite a few hand-held options for SPL meters, mostly you're going to want minimum and maximum hold as a feature, and on higher end models,the frequency at which this SPL was achieved (eliminating the need to play individual tones, and allowing you to use a sweep). These will stay at the peak SPL (dB's) reached, or show the lowest SPL during the time you take a reading. If price is not an object, some of these systems work extremely well, in the $200-300 range. Other lower end models will do basic min/max readings, but usually not with %100 accuracy, and usually within a limited range, usually not into the really high (140+) SPL levels. Another draw back is the systems usually have built in mics, which are often not going to work as well or give an accurate reading like a windshield mounted system like Termlab will. If you are not trying to compete, and just need a some what accurate measurement, low end models like this:

http://www.amazon.com/Scosche-SPL1000F-135DB-Max-Meter/dp/B001CMKFH8

or

http://www.amazon.com/gp/product/B000EWY67W/ref=pd_lpo_k2_dp_sr_2?pf_rd_p=486539851&pf_rd_s=lpo-top-stripe-1&pf_rd_t=201&pf_rd_i=B001CMKFH8&pf_rd_m=ATVPDKIKX0DER&pf_rd_r=0T4ARZ6CQ24FR1TFWAB6

Are worth a look. As for higher end models, looking at 130db+ it's almost cost effective to buy a termlab system. For all your options, just do a quick search for 'SPL meter' on amazon/google shopping etc...