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Showing results for tags '4th order'.
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musgofasa posted a topic in Newbie Sign INHi guys, Just got the third 18 in this week and we are starting a new build in a 2002 Chevy Suburban. We've got a TON of room as we're going to go up to the B pillar. We're using 3 SSA Evil 18" subs on 3 Linear Power 2250 amplifiers which should be at 2500w ea (maybe a touch more at 15.8v we will be running with dual alts/batts etc). I've modeled these subs till my head hurts and I've asked a few people for opinions on the enclosure and gotten quite a mixed result. The most popular opinion has been a 4th order using 3 to 3.5 cu ft ea sealed and 9 to 10.5 cu ft ported...modeling looks best to me at 3.5 and 31.5 cu ft with a 30x17.25 port (roughly 90% of total Sd) Gives me a port velocity around 20m/s at peak but the low end of the output suffers a little in the model. I've built literally thousands of boxes but only a few walls and honestly I'm not sure how it will perform considering the smaller cabin space in front of the box. Our ultimate goal is a reasonably musical response with as much output in the hair trick range as possible. Doesn't have to play into the teens and doesn't have to do 160s at 55hz but would like it to be a demo monster and play music. With that in mind I've also modeled a 6th order and ported walls and come up with a better looking curve...I have only done a few 6th orders and never anything nearly this large. Most of mine have been 1:1ish depending on modeling but this one seems to work out better at 18 rear tuned to 24hz and 25 front tuned to 50hz. Has anyone here done a band pass with these subs in a very large vehicle like this? Or would anyone be willing to take a look at the numbers on these subs and see if you might have a better idea on the band pass design for them? I've seen quite a few vids of 4th orders and I know a few people using 4ths but haven't heard them. Considering our goals and the relatively low power I want to take advantage of all that airspace :-) Subwoofers in question, number of subwoofers & subwoofer size: SSA Evil 18D2 Amplifier being used, specifically the model number. Linear Power LP2250 Fabrication skill level: Expert (27 years building and competing) Preferred material to be used (i.e. MDF, fibreglass, etc) MDF multi layer Vehicle which the subwoofers will be used in: 2002 Chevrolet Suburban Musical preferences: Demoing at shows, pop, some rap and Dub and a LOT of Rock/classic Rock System goals: Primarily fun at shows and parking lots. Demoing low tones and musical Previous subwoofers you have used, and their installation particulars: many many many brands types of installs over 27 years List any research you have previously done: Youtube vids of these particular subs and others with 3 18s as well as comparable subs, checked with other builders and searched here for band pass and threads on these subs.
What's up guys, I have a 00 jeep grand cherokee. I have two crescendo 5500s and three zv4 18s which I'll be selling for two nsv3 18s. This is my first wall I'm building and I want to make sure I'm using the right ratio and box size. I was thinking of using a 3:1 ratio and anywhere from 2.5-3 cubes sealed per woofer and 15-18 ported for the pair with a 25-47hz range. Any help or suggestions is much appreciated.
Alright guys, I finally got my build up and running (its in the build log section if you need to see it) and I am asking myself if I need more power. Currently I am running an AB1100.1, and during testing had it wired up but scored a 150.2. After wiring it down for peak power from the amp it scored a 154.2. Te reason I ask this is because these subs seem to be laughing at that amp.. I mean I know they are underrated at 2250 RMS but they literally only move 3/4 of an inch at most (20-30hz) and get stupid loud in that box. I am looking to add more batteries, maybe another alt, and maybe gonna add another AB1100.1. I am just worried that the 3" coil wont be able to handle it at full power.. Anybody have any ideas on what they think they could take (I only give clean power), or know of anyone who has had these up around that power level?