Revdoc Posted March 18, 2015 Report Posted March 18, 2015 Hi everyone, I recently swapped 2 PSi level 2 18s for 2 Skar Zvx-18s (version 1) and thought you all might be interested in the results. The PSi subs were loud but I wanted more low end extension, and had no room or desire to mess with my box size or port. With that in mind I modeled several different subs on WinISD and eventual settled on the Zvx-18s (finding them for $269 on Amazon helped a lot with that decision). The meter used was a splmeter.com dbm-2, it's not a TL by any means but it is supposed to be within 3 dB of a TL. I assume it is accurate compared to itself, I make no claims that these numbers are "legal" or anything just that they show a difference between two subwoofers. Box specs are 10.8 net cubes, 8" x 20" port 22" long, tuned to about 35 hz according to WinISD. The SMD IM-SG says it's more like 32.5-33.5 hz. Amp is a SQ 3500D.1. PSi subs are fully decked out Platform 2s with the high performance option, 8 ga direct connects, and CF dustcap. Skar subs are ZVX-18 v1 with the black logo, no options or modifications. Car is a 2007 Ford Escape, box fills the entire cargo area behind the rear seats but there is no wall. Subs and port face forward. 1 Optima red top under hood, 4 runs of 1/0 from front to back, 2 power 2 ground, 2 XS Power D925s in the back by the amp. http://i.imgur.com/tiM7uX3.jpg and http://i.imgur.com/vLsFxuj.jpg a couple of pics of the box and amp. Results: Max SPL with PSi = 149.9 dB at 47 hz Max SPL with Skar = 148.6 dB at 47 hz
Mustang2dakota Posted March 18, 2015 Report Posted March 18, 2015 I like your overall approach on how you went about this. And the graph was a nice touch edit: phone just loaded the graph 2014 JKU Sound: pioneer xav-65 4 12in pioneer tsw3003d4 2 pioneer gm-d9601 (much more in route) General: 18in worx rims 33in tire stinger src bumpers light bars 6k hids 2in leveling kit 3.25in lift The Build Log: http://www.stevemeadedesigns.com/board/topic/195839-2014-jku-build-4-12s/
Revdoc Posted March 18, 2015 Author Report Posted March 18, 2015 I accidentally posted this before I was done. Oh well. Anyway, as you can see from the numbers I got the desired extra low end from the Skars that I wasn't getting with the PSis. I lost a dB or two peak, but the gain at 30 hz is worth it. Also, the Skars are fresh out of the box without any break in, and they were stiff as hell. Might get a little louder over time. A few lessons learned: it's harder to hit 150 dB than I thought. Model your subs in WinISD before purchasing. PSi PF2 are a bargain at $325-350, if the Skars weren't discontinued I'd have to buy new and they are $479 new.
hdorre Posted March 18, 2015 Report Posted March 18, 2015 That graph.. is that WinISD's data or from actual termlab testing? Maybe i missed it somewhere. On 5/8/2011 at 7:38 PM, Kranny said: On 5/8/2011 at 7:35 PM, 'Maxim' said: It hurts me inside when I read stuff like this and remember you're 15 LMFAO so true Mitsubishi 3000GT (Old Build) Headunit: Pioneer 80PRS Frontstage: (2) McLaren Audio MLT-2 Tweeters & (4) PRV Audio MR Series Neo 6.5" Mids Substage: 4 15" Hybrid Subs - Tantric Motors & Sundown Softies Amps: Banda 2.4D Amp (Tweets), American Bass VFL 350.4 (Mids), and (2) Ampere 3800s Electrical :Singer 260A Alt & JY Power Lithium 2005 Chevy Colorado Ext Cab Headunit: Pioneer 80PRS Frontstage: 4 PRV 700Ti Tweets & 6 10" Delta Mids on 3000wrms Substage: 6 Fi BTL 18s in a 4th Order Walkthrough on 3 Wolfram 4500s Electrical: Singer "390" and JY Power My Official Feedback Thread
CstrokerV Posted March 18, 2015 Report Posted March 18, 2015 so the skars are more suited for the box you built ? or even in winisd you couldn't get the psi's to model with lower extension? my build http://www.stevemeadedesigns.com/board/topic/142505-small-build-log-4-dc-lvl3-10s-tl-update-link-to-rebuild/ http://www.stevemeadedesigns.com/board/topic/154258-rebuild-6-lvl3-12s-update-small-video-nothing-spectacular/ new build http://www.stevemeadedesigns.com/board/topic/188181-03-trailblazer-slow-build-8-dc-lvl3-12-m1-motor-m2-parts/
Triticum Agricolam Posted March 18, 2015 Report Posted March 18, 2015 Awesome job with modeling and before & after testing! I wish more folks would do stuff like this rather than just relying on the ear-o-meter!! Those PSI subs have a high QTS and low FS, I'm not surprised they didn't hit as low as you would want. How closely did your measure results match up to what you saw in WinISD? Would you mind posting a picture of your WinISD graphs? "Nothing prevents people from knowing the truth more than the belief they already know it.""Making bass is easy, making music is the hard part."Builds:
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