TLEJ Posted January 17, 2011 Report Share Posted January 17, 2011 (edited) So I built my first box, and when measuring it with a tape measure, it's to perfect specs from Torrez's calc. It's tuned to about 33hz... Here's the build log http://www.stevemeadedesigns.com/board/topic/97119-dc-audio-honda-accord-build/page__p__1344538__hl__Audio%20Accord%20build__fromsearch__1entry1344538 Now my problem is.. I have my amps down low now because these 2 12's are still being broken in., .. (I might need to mess with my subsonic? idk.. idek what that is. It only goes to 50hz (I think), but my box is tuned to 33.. so I don't get this stuff.. The problem is like.. The subs are moving, and they just aren't really creating bass.. the box is all sealed off (besides the port..).. Maybe I'm just use to my 2 15 kicker cvrs? Should I try stuffing the box a little? I built it to what DC said. I just don't really know what I'm doing. Edited January 17, 2011 by TLEJ Quote Link to comment Share on other sites More sharing options...
Namosh Posted January 17, 2011 Report Share Posted January 17, 2011 Make sure one isn't out of phase. Quote My Ram Quad Cab Blow-through Link to comment Share on other sites More sharing options...
TLEJ Posted January 17, 2011 Author Report Share Posted January 17, 2011 (edited) Nope, it's not that. Is it because my box doesn't have 2 chambers separating the subs? I mean, they can get loud, but only on weird notes in songs.. Maybe my tuning is just WAY off? .. I mean, I built it JUST like it says, but something is just off.. I tried turning the box all different ways, and it pretty much sounds the same no matter which way it's facing. (Unlike my 15s that sound like NOTHING if they're facing me compared to being spun around backwards) Edited January 17, 2011 by TLEJ Quote Link to comment Share on other sites More sharing options...
Justin Posted January 17, 2011 Report Share Posted January 17, 2011 +1.. Quote 99 2dr Blazer Kenwood KVT-614 SounDigital SD16k 4 Fi BTL 18s 4 hertz high energy 6.5s comps 4 stock ad244 alts 6 g31s batts 8 runs 0ga Link to comment Share on other sites More sharing options...
Robert8252 Posted January 17, 2011 Report Share Posted January 17, 2011 What's your amp settings. LPF should be 60-79hz Subsonic about 30hz Do you have your subsonic all the way up? That will cut out all your bass Quote 2013 F150 Crew Cab Old Build Log Feedback 2013 F150 Equipment - Some Awesome Stereo Sound Making Stuff Link to comment Share on other sites More sharing options...
Namosh Posted January 17, 2011 Report Share Posted January 17, 2011 I'd still check the polarity anyway....just unhook one of them while it is playing and see if it helps. I'm not doubting whether you wired it right. I just happened to get a brand new DC XL not long ago and the pos and neg terminals are backwards. Quote My Ram Quad Cab Blow-through Link to comment Share on other sites More sharing options...
Freshman6969 Posted January 17, 2011 Report Share Posted January 17, 2011 phase issue, check your wiring, same thing happend to me Quote Legal TL scores145.6 on the dash sealed up in the low 40hz area with the port out145.5 on the dash sealed up @30hz with the port inless then 1k clamped on a 3.5k! Why would you EVER WANT flex?huh?...flex is what can make the lows lower and more air being pushed correct? My FeedbackJeep-BuildlogPT LOSER buildlog Link to comment Share on other sites More sharing options...
Baydestrian Posted January 17, 2011 Report Share Posted January 17, 2011 The subsonic filter cuts out Frequencies below what you set it too, needed for ported boxes tuned to a FQ so you don't go below the tuning freq of the box and ruined the subs. Like said above put it to 30hz since the box is tuned to 33hz, this will then not play any note under 30hz. If you have it set at 50hz then any bass under 50 will not play and everything over 50 will lol, this could be your problem. Quote 2015 Mazda 6 JVF Customz 4.0 Proto 15>Wolfram W4500 @ .5ohm 2 Sundown Neo 6.5 + 2 CT Meso Tweeters (Front) x Kicker KS6.5 (Rear)>JL Audio VX400/4i NSB-AMG35 (front) / 40ah Lithium Headway (Rear) built by Erni Audio & Electrical Link to comment Share on other sites More sharing options...
TLEJ Posted January 17, 2011 Author Report Share Posted January 17, 2011 (edited) It's possible it could be a phase issue.. but would they be moving oppositely? Like one going in, while the other is going out? And well my subsonic is around 30 I believe, (Need to double check when I have some light), and Frequency Response: 10Hz ~ 30Khz +/- 0.5dB Variable high pass (50Hz-500Hz & 500Hz-5KHz) Variable low pass (50Hz-500Hz & 500Hz-5KHz) Don't know if that helps at all EDIT: and What's your amp settings. LPF should be 60-79hzSubsonic about 30hz Can you explain where you got the LPF number from? just wondering how it's calculated Edited January 17, 2011 by TLEJ Quote Link to comment Share on other sites More sharing options...
osamio Posted January 17, 2011 Report Share Posted January 17, 2011 (edited) It's possible it could be a phase issue.. but would they be moving oppositely? Like one going in, while the other is going out? And well my subsonic is around 30 I believe, (Need to double check when I have some light), and Frequency Response: 10Hz ~ 30Khz +/- 0.5dB Variable high pass (50Hz-500Hz & 500Hz-5KHz) Variable low pass (50Hz-500Hz & 500Hz-5KHz) Don't know if that helps at all EDIT: and What's your amp settings. LPF should be 60-79hzSubsonic about 30hz Can you explain where you got the LPF number from? just wondering how it's calculated The low pass filter allows frequencies LOWer than the setting (hence low-pass) to get through, while blocking everything above that frequency. Where you set it is mostly personal preference, in a complex install you would tune it to achieve flat frequency response, so the high end cuts off right about where your mids or mid-bass take over. As a basic way to set it, keep it right in the range he suggested. If you have mid-bass or large range mids, then go to about 60hz. As for the sub sonic filter, the basics are that when using a ported enclosure, if your subs play a frequency that is below the box's tune, the box no longer cushions the sub, and it turns into a free-air situation, which will cause the sub to over extend and bottom out. Ideally, set your subsonic filter right at the tune of your box, if your eyeballing it, go just above the tune to be safe, so if you have a 32hz box, set the subsonic at 32hz or just above it. As for the low output, first off, did you compensate for material thickness when making your measurements and cuts? if you used 3/4 inch MDF, but didn't compensate for that thickness when making the measurements, your box could be 1.5 inches too small in every dimension. Also, check to see if it's a phasing issue by disconnecting one sub woofer and see if the out put improves. I believe someone said that already... If it does, check your wiring. Also make sure your gain is set correctly, i'm sure you've done that already though. **Edit did you seal the box with silicone? even if you wood glued the joints, it's always good to go over it again with silicone or a similar sealant, and painting the box with a poly urethane sealant, or latex paint can help seal the MDF itself to prevent microscopic leaks through pores in the material. That usually only matters at higher SPL... Edited January 17, 2011 by osamio Quote 2009 Cobalt LT Pioneer Headunit 2x Pioneer 6 1/2 (stock amp) 2x Pioneer 1" tweeters (stock amp) 2x Pioneer 6x9 (stock amp 4x Pioneer 6 1/2 Pioneer GM-6400F Soundstream DTR 1700 R.I.P 2x Champion series PRO 12" subs 0 AWG Big 3, Stinger SP1700 battery To come: New or repaired DTR!! Link to comment Share on other sites More sharing options...
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