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Want to enter into street B Class..... 

 

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Posted: Fri Aug 25, 2006 11:13 pm 
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ED911 wrote:
I want to know what amp and configuration I should run to try to push these subs into the 130db mark.
Street B allows me to run 2 externally bridged amps, what I want to know is it worth buying another one of these amps, or a different one altogether?
What size amp/amps would you recommend to power these subs.
And how big would the box need to be?
Hope this is a bit clearer, cause I can't make hide nor hair of whats been said now. :shock: :lol: :lol:
Thanks again....


Ok best to run a single large monoblock. On your budget i would look at the Jaycar one 1,500rms for $550ish

I would try your current subs for now, they will be fine if the box is designed well.
I dont know the subs well enough to reccomenend a box but around 3.5c/f ported would be the go.

With 2 x 0g runs from the battery, the Jaycar amps, your current subs + good box will get you high 130's................

 

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Posted: Fri Aug 25, 2006 11:27 pm 
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Yep i was originally looking at 3.6cf but 3.5 is prolly closer would you be able to give me rough dimensions I'd need for a box that size? 25mm MDF?...

 

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Posted: Sat Aug 26, 2006 1:19 am 
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sorry guys ohms and all the rest is still a brain f**k for me but i'll have a go.

From the battery I run a 0g cable to the Jaycar 1,500wrms d class mono.
I bridge the subs together to run off this amp.
From my rough (very) calculations this amp running at 4ohms should produce around 700-720w RMS at 12V (battery), is this correct?
But if this is right that equates to around 350-360w RMS, but won't this overload the subs, cause according to what you said before Kev the subs are only 200w RMS.

I just hope I'm not starting to piss you guys off, you are both being really helpful. Much appreciated....

Can you please give us a diagram might help for me to understand better...

 

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Posted: Sat Aug 26, 2006 11:15 am 
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send me the specs of your drivers and ill design a box for you (roughly) but its a good start, i totally agree with what aaron said , and kev had some really good points 2, if your doing spl dont skimp on the amp, btw guys (sry to hijack) street c class is 2 10" subs isnt it?

 

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Posted: Sat Aug 26, 2006 11:56 am 
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cooki street C is:
-1x18"
-Max of 4x12"
-Max of 6-10"
-Max if 8-8"

4 aub amps or 8 externally bridged amps...
I'll pm you cheers mate....

 

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Posted: Sat Aug 26, 2006 12:25 pm 
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You are pretty much right. subs will end up seeing aomewhere around 700rms between them (350rms a piece)

The amount of power subs can handle is dependant upon a lot of factors.
- Obviously the sub built quality itself
- Clean amplifier power
- The frequency being played through the subs and their rated X-max (dont confuse x-max with power)
- box size and tunning.

As mentioned u beleive they would be fine with 350rms each if the box is tuned correctly and the right frequency is played.

Whatever you do dont tune the box to say 40htz ten play any frequencies below that at loud levels.

The subs become unloaded and will x-max until they are destroyed. Music will not be a probelm for everyday listening i am talking about when burping for SPL.

If you design te box right, find the resonant freq of the car then get the larger amp you should do fine. You will also be able to just pop out te subs and put better ones in without needing to re-do anything down the track when your ready.

Your prompting me to do a tutorial just on SPL.......

 

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Posted: Sat Aug 26, 2006 3:29 pm 
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Thanks again mate.
Quote:
Your prompting me to do a tutorial just on SPL.......


That would be good too as I have no idea what you mean by the resonant freq of the car :oops:
But yeah I'm starting to get the idea...

Also one more thing about the street B class. Are you allowed to run an amp for your front components? cause the rules are a bit unclear for me in regards to this...

 

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Posted: Sat Aug 26, 2006 6:43 pm 
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Yes if it's used to drive fronts then thats fine.

 

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Posted: Tue Aug 29, 2006 9:01 am 
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ed911 i have my DD9915 sub for sale as well as pyroay old amp which pumps out 4500wrms as well as 3.7cf 40hz ported box, spl meter and every thing u need really pm me
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Posted: Tue Aug 29, 2006 10:00 am 
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gros20 wrote:
ed911 i have my DD9915 sub for sale as well as pyroay old amp which pumps out 4500wrms as well as 3.7cf 40hz ported box, spl meter and every thing u need really pm me


hehe mind sayin how much youd like to part ways with it for .... cant imagine it would be too light on the hip pocket.

 

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Posted: Tue Aug 29, 2006 10:02 am 
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In the right car 150db+ from that amp and sub

 

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Posted: Tue Aug 29, 2006 10:20 am 
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I wouldn't mind taking my ute to a test and tune day to see how it goes ... but it sounds like I could be eligible for Street Class B as well.

Now to get the guts to turn up to an event and not look like a N00b that I am when it comes to car audio.

 

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Posted: Tue Aug 29, 2006 10:21 am 
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pyroay wrote:
In the right car 150db+ from that amp and sub


yeh with that gear certainly should be able to just crack into the 150's ... hehe might throw out his street B hopes tho :P if hes chasin these sort of figures

 

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Posted: Tue Aug 29, 2006 10:21 am 
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$2500 for every thing
sub,amp,box,spl meter, wiring.

oh please note this box is a big as u get in into an EF boot any bigger u would have to build it in there. im dieing to try it in my gf's nissan tiida
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Posted: Tue Aug 29, 2006 10:22 am 
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Mechan1k wrote:
I wouldn't mind taking my ute to a test and tune day to see how it goes ... but it sounds like I could be eligible for Street Class B as well.

Now to get the guts to turn up to an event and not look like a N00b that I am when it comes to car audio.


what gear are you running

 

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