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how do i get the most spl?


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durangomanz 
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Joined: August 03, 2002
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Posted: September 03, 2002 at 5:00 PM / IP Logged  

hello,

i hope someone can help me with this i just got my box built for 2 12" cerwin vega strokers dvcs my question is in order to get the most spl which way do i need to set my box ?subs firing up ?subs facing the rear ?or facing the front?

crroush 
Copper - Posts: 151
Copper spacespace
Joined: August 02, 2002
Location: United States
Posted: September 03, 2002 at 7:59 PM / IP Logged  

how do i get the most spl? -- posted image.umm, what is the raw dimensions of the box, volume, is it vented, etc...what are the thiele small specs for your strokers etc....

Craig

Philo 
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Posted: September 03, 2002 at 9:08 PM / IP Logged  

it is a good rule of thumb that the further a bass note travels, the lower a note you will hear. The thinking is that the bass note must travel a Quarter of a wave before the note matures. In other words if your vehicle is large enough to face the woffers backwards, where they can reflect off the back and sides of your trunk then bounce back forward, you will usualy get a more powerful low, and in most cases a higher SPL. Go to a couple small shows, They are usualy happy to let you get in a test run, where the big competitions rarely have time to let you experiment.

17 years in the 12 volt industry MECP 1st Class
Velocity Motors 
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Joined: March 08, 2002
Location: Manitoba, Canada
Posted: September 03, 2002 at 9:17 PM / IP Logged  

Bass is mono ( don't really know where it's coming from. Put more focus on the power aspect of the setup. Make sure that the subs are getting the power needed and more important make sure that the voltage is consistent for the amplifiers. The lower the voltage the lower your SPL.

Jeff
Velocity Custom Home Theater
Mobile Audio/Video Specialist
Morden, Manitoba CANADA
TheRapture 
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Posted: September 04, 2002 at 9:16 AM / IP Logged  
what is your box tuned to?   and what is the cubic feet?
the12volt 
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Posted: September 04, 2002 at 9:45 AM / IP Logged  

BTW, what vehicle is this box going into?

F4Pilot 
Copper - Posts: 113
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Joined: August 28, 2002
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Posted: September 04, 2002 at 11:04 AM / IP Logged  

All of the above posts are things that need to be taken into consideration.  Philo provides good information.  But SPL related to box direction wont make a difference unless you get the enclosure correct.  Ive found that box direction will mostly help where the bass is heard, inside vs outside.  Personally, I go for feeling the bass rather than hearing it. 

If you are going to compete,  youre going to need much more help than can be learned  over this bulletin board.  If you just want your system to hit, youve already done half the work by using the Strokers.  Make sure you have plenty of power.  Normally CV's dont require much power to hit, however the Strokers are a different beast.  All this being said, the dimensions and type of box is critical to performance.   CV's tend to be effectively loud but need airspace for low notes even if tuned using reflex type enclosures.  Havent done a Vega in a while but as far as Ive seen, CV doesnt offer recommended sealed dimensions.  Hope you have plenty of space. 

02 Odyssey / 99 F4
TheRapture 
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Posted: September 04, 2002 at 2:38 PM / IP Logged  
F4Piolet has it deadon!
durangomanz 
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Joined: August 03, 2002
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Posted: September 04, 2002 at 5:30 PM / IP Logged  
its going into a 99 dodge durango the box is huge i think that its a little over 8 ft of airspace alltogether for 2 of those strokers
Philo 
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Posted: September 18, 2002 at 12:16 PM / IP Logged  
Another rule of thumb is double your power, or double your speaker surface area, you get 3 more DB each time. So you can see, those high db scores are going to take a big wallet. Your best bet is to build the perfect box, good placvement in the vehicle, and run as much power as you can afford to your subs. Get just the right track to play at the show.
17 years in the 12 volt industry MECP 1st Class
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