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Discussion Starter #1
Has anyone ever seen an 18-inch sub installed in a B-body? One of my two 12s is almost blown, and I'm thinking about doing something radical to replace them
 
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Discussion Starter #3
Check out the DD Audio 9517. They call it a 17, but from what I hear, it is actually an 18". This company makes AMAZING subs. My brother has a 15" and it is incredible. HTH
 
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Discussion Starter #4
Just FYI if you do a cone area displacement comparison between multiple smaller woofers vs 1 larger woofer and box volume requirements you'll see that multiple smaller drivers win every time.
Example - 3 10" vs 1 18" - 235.5 sq in for the 10's vs 254.34 and box volume would be approximately 3 cuft (and smaller) for 3 10's vs 9 cuft (and larger) for 1 18" woofer. You get a 3db coupling effect from having multiple drivers next to each other and with proper enclosure building they'll hit the same low notes due to secondary harmonics.

Just FYI
BTW I was on Team Streamline Audio when we built Alma Gates 164.9 DB Bronco with 46 10" woofers and 23 1400 watt amps.

Mike
 
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Discussion Starter #5
The main reason why I'm drawn to a single 18 is the fact that bigger drivers generally reproduce lower frequencies better. I love subsonic bass... the kind you can't hear but can really feel. :cool: I haven't been able to get much of it with 2 12s.
 
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Discussion Starter #6
Trust me build a nice 7th order bandpass porting through the back deck of the trunk with 4 10's and you'll be in heaven. to make it perfect make the seal between the trunk and the interior cabin air tight and it will make a huge difference.

I had 6 15" woofers through the rear deck the car isobarically mounted when I took 6th place in the Expert class 1995 IASCA world finals in my 92 Caprice. I only did the 15's for the WOW factor that the MTX Thundercast series gave you when you saw the 3 baskets coming up through the rear deck.
Mike
 
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Discussion Starter #7
7th-order bandpass? :eek:
Highest order I've ever heard of is 6th, and don't those things have to be built perfectly or else they'll sound like crap?
Define "heaven" :D. Pure SQ with good SPL, or just all-out SPL?
 
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Discussion Starter #8
Alright, so I did some research
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7th-order is just a 6th-order with a tuned port between the two chambers, correct?
Almost everyone on the audio forums seem to think that bandpass boxes sound like crap. I'm going for SQ here as well as SPL... would 7th-order still keep me happy? Trunk space is a big concern too
 
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Discussion Starter #9
Bandpass boxes absolutely do not sound like crap. Somebody doesn't know how to tune them if they say that.
Mike
 
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Discussion Starter #11
I'm gonna go with the bambinator on this one. The 18 probably won't even get as loud as you 12s. And they are gonna sound horrible.

18s are so low to the point they are just plain sloppy when they hit. Sure they are low but its pointless when the bass line and the highs are a .5 second off from each other.

I would say go with 15s. They get very loud. They get low enough. They are more practical than 18s and sometimes if you use enough of them you can get that wow factor. The only trick to 15s is making sure you have enough trunk space for the box. 1 15 is easy in a trunk. But if you use any sub other than a solobaric, 2 15s and more are gonna be difficult if you wanna give them their maximum enclosure space which is highly recommended for best results.

Why do you need anymore wow factor any ways. Have you looked at your car lately!?! Isn't that wow enough. :D
 
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