140 db is it possible?
Printed From: the12volt.com
Forum Name: Car Audio
Forum Discription: Car Stereos, Amplifiers, Crossovers, Processors, Speakers, Subwoofers, etc.
URL: https://www.the12volt.com/installbay/forum_posts.asp?tid=115699
Printed Date: April 28, 2024 at 7:50 PM
Topic: 140 db is it possible?
Posted By: i_want_the_boom
Subject: 140 db is it possible?
Date Posted: August 17, 2009 at 1:55 PM
I want to know if it is possible to get over 140db with 2 jl13w7 pushed by 2000wattts rms? it will be in a 2002 chevy suburban. I know there are alot of factors that can determine this like what kind of box there in and prolly alot other things. I just want to know if 2 13w7 can hit 140 or close to it. If so how would you go about doing that? ------------- If the trunk dont rattle then its not loud.
If it's to loud then you're to old.
Replies:
Posted By: i_want_the_boom
Date Posted: August 17, 2009 at 3:40 PM
Ok I did a search on hear and seen that 140 is pretty loud, and I dont think I want it to be that loud as a daily driver. More like 100 to 115db would be more what im looking for. what size box would i need to get the best spl from these speakers? I really dont want to push more than 1000watts apeice for these speakers as i do not wish to damage them. how could I maximize out put from these speakers?
-------------
If the trunk dont rattle then its not loud.
If it's to loud then you're to old.
Posted By: DYohn
Date Posted: August 17, 2009 at 3:50 PM
Two 13W7's in 5 cuft (141 liters) tuned to about 46Hz and driven by 2KW should hit about 132 dbSPL according to a quick Unibox model. ------------- Support the12volt.com
Posted By: i_want_the_boom
Date Posted: August 17, 2009 at 5:17 PM
Thanks dyohn thats what I was looking for. Is that sealed or ported? and is that a single chamber box or dual chamber? If I tunned the box lower say about 30-35hz how much would that affect the results. thanks for the help.
-------------
If the trunk dont rattle then its not loud.
If it's to loud then you're to old.
Posted By: DYohn
Date Posted: August 17, 2009 at 5:38 PM
i_want_the_boom wrote:
Thanks dyohn thats what I was looking for. Is that sealed or ported? and is that a single chamber box or dual chamber? If I tunned the box lower say about 30-35hz how much would that affect the results. thanks for the help.
Sorry, vented single chamber. Tuning lower will drop the peak SPL (but be more musical) ------------- Support the12volt.com
Posted By: soundnsecurity
Date Posted: August 17, 2009 at 5:48 PM
i think 140db is very possible with those W7's. 140 is not that loud and nobody said anything about it having to be all the way up all the time. i keep my 18 turned way down for daily driving but if somebody wants to have their ears destroyed real quick then i turn it up.
-------------
Posted By: paidnfull
Date Posted: August 18, 2009 at 12:16 PM
You should be able to get over 140 pretty easy if you will truly have 2000watts rms. I saw a single 13w7 hit 149 on the dash with two jl1000.1's in an explorer. Gonna need a HO alt, and at least one really good battery to create that kinda power though.
Posted By: i_want_the_boom
Date Posted: August 18, 2009 at 12:27 PM
I was actually going to put 2 jl13w7 and 2 jl 1000.1 with an upgraded ho alt wasnt sure if i was going to need a extra battery or not, havent decided which interior speakers yet but they will most likely be jl.
-------------
If the trunk dont rattle then its not loud.
If it's to loud then you're to old.
Posted By: paidnfull
Date Posted: August 18, 2009 at 12:36 PM
Probably won't need a second battery, although wouldn't hurt anything as long as you have a good alt. Just make sure you upgrade your stock batt. Kinetic, Optima Redtop, Exide Orbital, etc. Stay away from the deep cycles for a starting batt, you'll burn em up quick. You should be in the 140's with ease. Even with a box designed for music. Tuned lower like dyohn mentioned above. I'm guessing the design program he used doesn't account for cabin gain, which should be significant in an suv
Posted By: jeffchilcott
Date Posted: August 19, 2009 at 4:00 PM
140db with 2 13W7's with the correct amount of power for them is completly possible, even in a daily tuned box.
I would start with something in the 6cuft range with a large slot port with subs firing up and port back at the tailgate. keep the port at least 12 inches off the tailgate.
Just worked on a single 12" L5 in a slot port enclosure powered by a kenwood 900 watt amp (clamped 880) and it was capable of 145.1db on a tone and 143.3 on music PEAK
All measurments on a Term-Lab USB, tones via USACI 2009 disk, music was Put on, cant remember who does that song.
That was a 2.5cu ft net enclosure tuned to 32hz. peak resonant frequency of the vehicle was 56hz on the meter
-------------
2009 0-1000 Trunk WR 154.0DB 2009 1001+ Trunk WR
2007 USACI World Champion
2007 World Record
2006 USACI Finals 2nd Place
Posted By: DYohn
Date Posted: August 19, 2009 at 4:40 PM
Yea, exactly the 132db I got in Unibox is the theoretical raw output from the enclosure all by itself. In a vehicle hitting 140 should be very possible. ------------- Support the12volt.com
|