CECAA850 Posted April 10, 2012 Share Posted April 10, 2012 Agreed. To me, a flat bass response sounds just that, flat. I always run my subs on the north side of flat. Usually 6dB or so. Quote Link to comment Share on other sites More sharing options...
glennconti Posted April 10, 2012 Share Posted April 10, 2012 IMHO the reason level bass would sound flat is we don't hear bass tones as well. So they need to be tweaked up. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted April 10, 2012 Share Posted April 10, 2012 I don't think that graph is accurate, at least not as far as the threshold of pain is concerned below 40 Hz or so. Quote Link to comment Share on other sites More sharing options...
glennconti Posted April 10, 2012 Share Posted April 10, 2012 Did you mean Threshold of Hearing (bottom red line)? The Threshold of Pain (top red line) at 40Hz on the graph is like 125 db. That would seem to be pretty loud and painful. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted April 10, 2012 Share Posted April 10, 2012 I've been in my son's mini-van when it hit 150 dB@34Hz measured with a calibrated termlab. It's not that bad. I wouldn't want to stay in there for extended periods but a 5 or 6 second burst isn't bad at all. Quote Link to comment Share on other sites More sharing options...
Quiet_Hollow Posted April 10, 2012 Share Posted April 10, 2012 I don't think that graph is accurate, at least not as far as the threshold of pain is concerned below 40 Hz or so. It is. It's differential (dB), not absolute (dB SPL). To get absolute, add 8 dB to any number pulled from the chart. I've been in my son's mini-van when it hit 150 dB@34Hz measured with a calibrated termlab. It's not that bad. With your ear up against against the windshield, where the mic was?? I wager that most folks would not share that same sentiment. [:S] Quote Link to comment Share on other sites More sharing options...
glennconti Posted April 10, 2012 Share Posted April 10, 2012 TABLE G-16 - PERMISSIBLE NOISE EXPOSURES (1)______________________________________________________________ | Duration per day, hours | Sound level dBA slow response____________________________|_________________________________ |8...........................| 906...........................| 924...........................| 953...........................| 972...........................| 1001 1/2 ......................| 1021...........................| 1051/2 ........................| 1101/4 or less................| 115____________________________|________________________________ This is from OSHA website. I googled "government noise thresholds". In case anyone is interested. Based on this I wouldnt listen to music over 90db for any extended period of time. Quote Link to comment Share on other sites More sharing options...
glennconti Posted April 10, 2012 Share Posted April 10, 2012 Based on the above I wouldn't listen to the stereo above like 90 db. (my other post got cut off) Quote Link to comment Share on other sites More sharing options...
ousig Posted April 10, 2012 Share Posted April 10, 2012 this is why most reference levels are 85db - to be "safe" for all of our ears. 85db is pretty loud for regular listening. another reason why arguing if your amp puts out 90 or 110 watts is irrelevant. Most of the time we are only using a couple watts to produce 85+dbs. and someone please correct me but I for some reason thought bass frequencies do not techincally hurt your ears? or maybe it just takes such higher dbs compared to higher frequencies Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted April 11, 2012 Share Posted April 11, 2012 [With your ear up against against the windshield, where the mic was?? I was in the front seat, my head was about 2' from the mic. I wager that most folks would not share that same sentiment. Most people there wanted a turn in the van, but it WAS an SPL competition.[]. Quote Link to comment Share on other sites More sharing options...
Quiet_Hollow Posted April 11, 2012 Share Posted April 11, 2012 I was in the front seat, my head was about 2' from the mic. In my vehicles (a coupe and a sedan), the difference in measured SPL from the driver seat and front passenger listening positions to the corners of the windows (where the meters are typically adhered) was +10 dB (about twice as loud) any where's between 60-80 Hz. What I was getting at, was that the SPL's where you were sitting were most likely lower than what was being measured. Loud as heck regardless, but not quite what was being recorded on the meter. Next time your in the van, kiss your ears up against the windshield and run a test tone in the subs' pass band. There's a lot more pressure change up there against that surface than back at the seats. ..and get those kids up to Dyess for a couple of B-1 afterburner takeoffs without any hearing protection. Wandering around clinically deaf for the rest of the day, and bleeding from their ears should quench any wanton bass addiction. [] Quote Link to comment Share on other sites More sharing options...
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