JasonJCarney Posted August 20, 2011 Share Posted August 20, 2011 Those numbers won't mean too much cause the volume used to get those readings was not "reference" . It does show you the difference between 2 A5-350's vs 1 in my system. The settings were on what audyssey set everything to. 4db difference between 1 sub and 2. Thought it was interesting. Quote Link to comment Share on other sites More sharing options...
twistedcrankcammer Posted August 20, 2011 Share Posted August 20, 2011 Those numbers won't mean too much cause the volume used to get those readings was not "reference" . It does show you the difference between 2 A5-350's vs 1 in my system. The settings were on what audyssey set everything to. 4db difference between 1 sub and 2. Thought it was interesting. Should be 3db, not 4! Go from 2 watts to 4 watts = 3db, go from 4 watts to 8 watts = 3db, go from 1 speaker to two = 3 db, go from 2 speakers to 4 speakers = 3 db, 4 speakers to 8 speakers = 3 db. decibels are not a linear measurenment!! 3db = twice the output physically. It takes 10 db for our inefficent ears to register that sound as twice as loud. Roger Quote Link to comment Share on other sites More sharing options...
JasonJCarney Posted August 20, 2011 Author Share Posted August 20, 2011 Could be a function of my measurement technique and my radio shack meter. So 3 db's is 2x as loud? Quote Link to comment Share on other sites More sharing options...
twistedcrankcammer Posted August 21, 2011 Share Posted August 21, 2011 Could be a function of my measurement technique and my radio shack meter. So 3 db's is 2x as loud? Physically, 3db is twice as loud, although it does not sound like it to the human ear, yes..... Although eight of your subs would be 9db louder then one sub, and percieved as almost twice as loud as one to a listener in a blind study. Roger Quote Link to comment Share on other sites More sharing options...
JasonJCarney Posted August 21, 2011 Author Share Posted August 21, 2011 So your saying 1 sub is as good as 3? Quote Link to comment Share on other sites More sharing options...
twistedcrankcammer Posted August 21, 2011 Share Posted August 21, 2011 So your saying 1 sub is as good as 3? I'm sure you have realized that two subs don't sound twice as loud, however, there is twice the output! You still get the benifit of twice the energy into your chest and couch though! There is a PWK dope from hope on this relationship. Hopefully, someone tomorow may post it for you. Regaurdless, do the math and figure out how many watts it takes to hit 121 db from a speaker that is say 80 db efficient vs: 104 db efficient like a klipschorn, and efficencies importance becomes imeadiately apparant. I hit 126 db at the center of a 13' x 17' room with only 4 TSCMs playing, not the seven I have now, nor the same room. This is at the center of the room, not 3 feet, and with no woofer. My KPT-684 can put out 130db at 3 feet, efficency at work here! Roger Quote Link to comment Share on other sites More sharing options...
twistedcrankcammer Posted August 21, 2011 Share Posted August 21, 2011 So your saying 1 sub is as good as 3? Diminshing returns audibly, especially when you understand that db is not a linear measurement and the inherent inefficiency of the human ear. Another way to look at it would be that you got an increase of 3db by adding one sub so now you have two. OK, now we add a third sub and it will only give you an increase of 1.5db over two subs. If you already had 4 subs, one additional sub is going to give you an increase of only 0.75db! Roger Quote Link to comment Share on other sites More sharing options...
Brunt Posted August 21, 2011 Share Posted August 21, 2011 So your saying 1 sub is as good as 3? Diminshing returns audibly, especially when you understand that db is not a linear measurement and the inherent inefficiency of the human ear. Another way to look at it would be that you got an increase of 3db by adding one sub so now you have two. OK, now we add a third sub and it will only give you an increase of 1.5db over two subs. If you already had 4 subs, one additional sub is going to give you an increase of only 0.75db! Roger I just sharted.[*-)] Quote Link to comment Share on other sites More sharing options...
Quiet_Hollow Posted August 21, 2011 Share Posted August 21, 2011 I just sharted. +1 Getting stinky in here. Quote Link to comment Share on other sites More sharing options...
Moderators Youthman Posted August 21, 2011 Moderators Share Posted August 21, 2011 I just sharted. You know they make adult underwear for people that have that problem. Some things are better kept to yourself. Quote Link to comment Share on other sites More sharing options...
StephenM Posted August 22, 2011 Share Posted August 22, 2011 Should just note that it is not always a 3dB increase when adding a second subwoofer. For example, if they are stacked, you should yield a 6dB increase; same as if you measured a subwoofer in an anechoic chamber at 1 meter and then measured it ground plane at one meter. Quote Link to comment Share on other sites More sharing options...
Heritage_Head Posted August 22, 2011 Share Posted August 22, 2011 Should just note that it is not always a 3dB increase when adding a second subwoofer. For example, if they are stacked, you should yield a 6dB increase; same as if you measured a subwoofer in an anechoic chamber at 1 meter and then measured it ground plane at one meter. Sometimes if you have a lot of room gain it can be a little more than 3db but if you have two identical subs level matched it’s always 3db. Twice as much = 3db. Quote Link to comment Share on other sites More sharing options...
CECAA850 Posted August 22, 2011 Share Posted August 22, 2011 Co-located subs will typically yield a 6 dB gain. I've seen twice as loud listed as 10 dB, or even 6 dB. I've never seen twice as loud listed as 3 dB. Quote Link to comment Share on other sites More sharing options...
Heritage_Head Posted August 22, 2011 Share Posted August 22, 2011 Co-located subs will typically yield a 6 dB gain. I've seen twice as loud listed as 10 dB, or even 6 dB. I've never seen twice as loud listed as 3 dB. 3db IS twice as loud, technically. The way the human ear responds to sound however, it takes 10db to be "perceived" as twice as loud http://www.google.com/url?sa=t&source=web&cd=2&sqi=2&ved=0CB0QFjAB&url=http%3A%2F%2Fwww.decibelcar.com%2Fmenutheory%2F115.html&ei=OcVSTvmJH8XosQLHgrDCBg&usg=AFQjCNFkBKO9tlI3mspj00Qi_FtP3CoEMQ Quote Link to comment Share on other sites More sharing options...
StephenM Posted August 22, 2011 Share Posted August 22, 2011 3db IS twice as loud, technically. Yes and no. A 6dB increase equates to twice the sound pressure (in pascals), whereas 3dB increase equates to twice the sound intensity (watts/meter^2). Basically, when you double the power into a single driver, you yield a 3dB increase. When you double the drivers in a colocated fashion and in phase, as well as double the power, you yield 6dB. Quote Link to comment Share on other sites More sharing options...
nezff Posted August 23, 2011 Share Posted August 23, 2011 rat shack meter isnt going to be accurate anyway. Quote Link to comment Share on other sites More sharing options...
Recommended Posts
Join the conversation
You can post now and register later. If you have an account, sign in now to post with your account.
Note: Your post will require moderator approval before it will be visible.