fordpride Posted September 5, 2016 Report Share Posted September 5, 2016 With a 4th order BT do I need a sub that works well in a sealed box, ported box or somewhere in between? Link to comment Share on other sites More sharing options...
hdorre Posted September 6, 2016 Report Share Posted September 6, 2016 sealed. high qts/ low ebp, lower fs, softer suspension. 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 Link to comment Share on other sites More sharing options...
fordpride Posted September 6, 2016 Author Report Share Posted September 6, 2016 One more. For a daily beater whst would be a good ratio 2:1 ? This is my first time building a BT and I willing to screw it up a couple times. Lol so any Adobe is really appreciated Link to comment Share on other sites More sharing options...
hdorre Posted September 6, 2016 Report Share Posted September 6, 2016 2:1 is definitely on the smaller side, but should play pretty flat. If you have room to spare, Id use it. 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 Link to comment Share on other sites More sharing options...
fordpride Posted September 6, 2016 Author Report Share Posted September 6, 2016 Room is my enemy. This is in a c notched hardbody. My plan is 3 12's in 2:1 Tuned to 45htz I have to get my tunnel welding in before I can get some ture measurements Link to comment Share on other sites More sharing options...
MrSkippyJ Posted September 6, 2016 Report Share Posted September 6, 2016 Ratios are not the way to think about a bandpass. Let that go. F150: Stock 2019 Harley Road Glide: Amp: TM400Xad - 4 channel 400 watt Processor: DSR1 Fairing (Front) 6.5s -MMats PA601cx Lid (Rear) 6x9s - TMS69 Link to comment Share on other sites More sharing options...
fordpride Posted September 6, 2016 Author Report Share Posted September 6, 2016 Inlighten me or a link please. Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted September 6, 2016 Report Share Posted September 6, 2016 Inlighten me or a link please. Here is the problem with ratios, they are a design shortcut and like all design shortcuts they make assumptions that can bite you in the ass if you don't know about them. Its not that ratios are always wrong, they aren't, the problem is they aren't always right. Depending on the T/S parameters of a particular sub, one sub may give you a very flat and musical frequency response in a low ratio (say 2:1 or less) bandpass box, however a different sub could give you very peaky output and sound totally different in the exact same box. The other problem with ratios is they infer that making the rear chamber smaller has the same effect as making the front chamber larger, or vice-versa (both increase the ratio). However this is not the case and those two actions will have very different results. Bandpass boxes are very tricky things compared to a regular ported box. Different people have different ways of designing them, with varied levels of success. To each their own. The way that works for me to is to size each chamber individually based on the parameters of the sub, the specs of the whole system, and what the desired performance is. "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: Link to comment Share on other sites More sharing options...
fordpride Posted September 6, 2016 Author Report Share Posted September 6, 2016 If I understand that correctly you are saying take the parameters of the driver and design a sealed box then use those same parameters to design a ported box and put them together? Link to comment Share on other sites More sharing options...
Triticum Agricolam Posted September 6, 2016 Report Share Posted September 6, 2016 If I understand that correctly you are saying take the parameters of the driver and design a sealed box then use those same parameters to design a ported box and put them together? No. What I'm saying is to take the T/S parameters and design a bandpass box with the proper sized sealed and ported chambers to do what you want it to do and don't worry about what the ratio is. "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: Link to comment Share on other sites More sharing options...
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