A local car stereo store "Sound Waves" http://www.soundwaveshq.com is this possible with home stereo? you guys remember that 60 grand McIntosh system? how many dB's do you think it would max out at? thanx
>>>is this possible with home stereo?> you guys remember that 60 grand McIntosh system? how many dB's do you think it would max out at? thanx
They are not hitting 161dB from 20Hz. >>>is this possible with home stereo?>>> What frequency and spl does glass break at Tom? >>> you guys remember that 60 grand McIntosh system? how many dB's do you think it would max out at? >>>>>>>>>>>>>> I have not heard the system but I have recenlty done alot of research on high SPL speakers ...pretty much the loudest you will find can hit 130dB from 3ft.(thats loud!) But if you set all speakers to SMALL and use bass-management to reroute all the lowest bass to the subwoofer...MINIMUM *dolby reference requirements* are 121dB. If you can hit clean reference levels...that's a hell of a HT. >>>>>>>>>>> Very few HT system can hit 121dB from 3ft much less the listening position. The way my system is right now is that I have no trouble hitting 120dB from 80Hz on down but cannot pull it off from 80Hz on up(however I am halfway there since I can get to 110dBs ) Shortly this problem will be fixed ------------------ James' DIY speakers
That's 161.xdB number probably came from a "burp" in which they used a tone in conjunction in knowing the frequency response of the vehicle. ------------------
TV can correct me if i'm wrong, but what I believe from my high school physics class this year is that the frequency and spl depends on the natural frequency of the glass, which will be different in different windows. For example, we were shown a commercial in which a singer shattered a wine glass singing a high frequency note. The only other this is that I think that if you get enough low frequency energy, that the pounding will be able to break the glass as well.
The natural resonant frequency of the glass will also vary with the thickness and its surface area. IIRC, there was a MMATS demo van that regularly shatters its windshield during a 50Hz tone at 171dB... That's regularly. ------------------
Doesn't the human heart stop somewhere in the 140's? ------------------ ...transmission terminated... Anubis [email protected]
I don't what the limit is but my gf is a nurse she's seen Heartbeats in the 150-160 range. Of course that's beata/min which is entirely different from dB. ------------------
Zane Johnson, If you want to spend lots of money, you could hit those kinds of levels in a HT. It would take a lot of speakers to do it. dB is a measure of sound pressure level. What you have in the car audio world is several speakers in a small space. Most HT rooms have about 10 times the volumn of a typical car. If it takes 12 15" woofers to hit 161db in a 175 to 200 cubic ft van, imagine what it would take to fill a 2000 to 2500 cubic ft room. Its interesting to watch one of the car audio contests. The windows are taped and sometimes have metal strips bracing the windows. Then they get several people to push on the doors to help keep air and pressure from getting out the door seals. Other than to be able to say you hit those kinds of levels there's no real use for it. It might be useful as a laxative Personally I think they're nuts. Derrick G ------------------
Most of the competitive "DB Drag Racing" cars are purpose built and could not be driven on the street. The glass is replaced with 1 - 2" thick plexiglass panels and the interiors are gutted and rebuilt with solid MDF panels, welded reinforcement and pretty much anything that can eliminate vibrations or flexing. Many of the finished vehicles gain thousands of pounds as a result. I have seen guys sit inside these things without ear protection in the warm-up area or after the contest. They have a site atwww.dbdragracing.com I think that BestBuys, Circuit City, Crutchfield etc...should prominantly display warning and informational literature that explains hearing loss. I have talked to many "loud" enthusiasts for car and home that really don't realize what levels can cause damage. Education is the key. ????? It pains me just to see them. Interestingly, a study recently reported that many shool age children have already suffered perminant hearing loss. Oh well, I'll get off the soap box now...
Paul - welcome to the forum. 170dB with one 15" driver? Care to explain where you heard this from? That seems pretty impossible to me.
I have been into car audio for quite some time now. It is not impossible to hit 160's-170 with one driver. Usually these are put it HUGE ported boxes, anywhere from 5-10 cu ft, and tuned to about 40-70 hz, depending on where the vehical has the most cabin gain. Most people that compete in the extreme 1-2 sub class have the subs in a very small car (honda crx, volkswagen rabbits etc) and have anywhere from 2000 watts to 10,000 watts on one sub. Not to mention the fact that they have tons of batteries, 1/0 or better gauge wires, etc etc etc. Official spl is on the dash, but some classes let you put the mic wherever you want, and then you seem to find higher scores. The record for street 1-2 is 172.3 I do believe 174.2 is where the records at this year for any class, and thats very good considering the atmosphere only allows somewhere around 190 dbs tops.
i have a friend who owns a car audio shop. They often deaden SPL comp cars w/ cement. ------------------
when i heard it, it was about half volume i believe and it was LOUD... i dont' think high SPL's is impossible to reach with 1 or few drivers... my neighbor has (3) infiniti Kappa perfect 10"s at like 400 watts a piece rms and i think he said he hits 130dB or so... the van was reinforced with something hard because the guy told me to kinda hit it and it wa HARD... like solid... it was overkill big time but it was cool
Just think if you construction a HT room properly! Of course, if you won't get anywhere close to 170dB - Who what's that? But you will certainly get some clean and loud bass. ------------------
170 with one 15"? NOT possible. to get 146 in my friends small car (Rx-7, glass hatchback) it took 2 12" Rockford Fosgate Power DVC (1000 watts rms) and a Rockford Fosgate 500.2 amp. A general rule of thumb is 3db increase is twice as loud, so 4 12"s, two 500.2 amps, 149db, maybe.
