SH73 Posted February 20, 2022 Share Posted February 20, 2022 I'm planning to build a 2x 12 bass cab. I've got a delimma , sealed bass cab or ported. I found some information that ported gives better frequency response and sealed may sound muddy but have more low end. I thought ported cabs give more low end. I've got a Fender rumble 100 and it's ported and the bottom end is deep, but with a 15 inch speaker. I'm looking for an overall solution maybe geared towards mid frequencies? I'm not into technical frequency graph response charts as they mean nothing to me. The question is sealed or ported? Any suggestions please? Quote Link to comment Share on other sites More sharing options...
Jus Lukin Posted February 20, 2022 Share Posted February 20, 2022 (edited) - Edited March 16, 2022 by Jus Lukin Quote Link to comment Share on other sites More sharing options...
SH73 Posted February 20, 2022 Author Share Posted February 20, 2022 Thanks, that what I was after as Steve Harris uses sealed Marshall cabinets with EV speakers. Quote Link to comment Share on other sites More sharing options...
itu Posted February 20, 2022 Share Posted February 20, 2022 Remember that the speaker has to be chosen after the cab: sealed construction needs different T/S parametres. Quote Link to comment Share on other sites More sharing options...
SH73 Posted February 21, 2022 Author Share Posted February 21, 2022 19 hours ago, itu said: Remember that the speaker has to be chosen after the cab: sealed construction needs different T/S parametres. Hi. Unfortunately that means nothing to me sorry, as I said the technical figures no comprendo. Don't know what T/S is without Googleing😁 but perhaps you could educate me Quote Link to comment Share on other sites More sharing options...
itu Posted February 21, 2022 Share Posted February 21, 2022 Thiele / Small. The parameters will tell you whether a certain element is meant to be put to a reflex or a closed enclosure. Read this short text: https://audiojudgement.com/thiele-small-parameters-explained/ 1 Quote Link to comment Share on other sites More sharing options...
SH73 Posted February 21, 2022 Author Share Posted February 21, 2022 This seems pretty heavy going, but is there a way of working out the dimensions of the cab if I know what speakers I'm using? Quote Link to comment Share on other sites More sharing options...
Boodang Posted February 21, 2022 Share Posted February 21, 2022 https://www.bluearan.co.uk/index.php?&category=Speaker_Building&masthead=Speaker_Plans&subheadnew=Bass_Reflex_Sub A lot of speaker manufacturers have cabinet designs to go with them. If you just use random dimensions it won't match the performance specs of the speakers. Don't try and work it out from scratch, use a tried and tested design. Just as a generality, I've found ported designs to be louder than sealed. Quote Link to comment Share on other sites More sharing options...
SH73 Posted February 21, 2022 Author Share Posted February 21, 2022 Surely if I know the speakers came from a 2x12 TC bass cab, I can use the cabinet specs to build it? Quote Link to comment Share on other sites More sharing options...
SH73 Posted February 21, 2022 Author Share Posted February 21, 2022 https://www.tcelectronic.com/product.html?modelCode=HE017 Quote Link to comment Share on other sites More sharing options...
itu Posted February 21, 2022 Share Posted February 21, 2022 Yes. If you want the size to be bigger, it is usually OK. efficiency - low end - cubic volume You make the enclosure smaller, either the efficiency becomes smaller, or the lowest reproducible frequency rises - or both. This is similar to the ISO - aperture - time trio in photography. Quote Link to comment Share on other sites More sharing options...
SH73 Posted February 21, 2022 Author Share Posted February 21, 2022 Thanks all, Iooks like lots of research ahead of building Quote Link to comment Share on other sites More sharing options...
SpondonBassed Posted February 22, 2022 Share Posted February 22, 2022 18 hours ago, SH73 said: Thanks all, Iooks like lots of research ahead of building Doing some homework that produces good results will usually give a long lasting sense of satisfaction. Good luck. 1 Quote Link to comment Share on other sites More sharing options...
Billy Mack Posted November 3 Share Posted November 3 This is very important and its worth repeating (Qtc 0.707 stuff); you must match your drivers to the enclosure and I am not just talking about the size of circular hole in the front of the audio speaker enclosure. Most audio drivers are now designed to be used in a specific type of enclosure with a specific volume (size). So when deciding upon your audio drivers you have to take into consideration the type of enclosure (ported, sealed) and the enclosure size recommended by the manufacturer. If their recommendations are not available you will have to take the other information that is given such as Fs, SPL, Vas, Qms, Qts, etc and figure that out for yourself. You can do that by using various complex mathematical equations or by simply plugging in the information about the driver into any of the many audio loudspeaker building software programs that are available. Okay, you now know to match up your audio speaker drivers to the enclosure size and type recommended; you have to do that with the midrange audio speaker also if it is not-rear sealed . The reason why you build an enclosure within an enclosure for a non-rear sealed audio speaker is that you'll want to isolate the air spaces behind the driver and midrange from each other to prevent them from "pushing" on each other. The volume of air displaced by a large woofer moving in and out can destroy the much smaller midrange driver and even if it doesn't, they will interfere with one another causing distortions which is not a good thing to have happen. Don't forget to add the total volume of the midrange enclosure to the audio speakers enclosure's total volume. Don't worry about building a separate enclosure for the tweeter; every tweeter that I have ever seen is rear sealed so the driver's air pressure won't affect it. https://diyaudiospeakers.5150.ca/types.html Quote Link to comment Share on other sites More sharing options...
Billy Mack Posted November 3 Share Posted November 3 If You Want "Big" Sound You Need Big Speakers It's only logical that if you want big sound with deep clean base you need big Speakers. I have read claims by some builders that their 6.5 inch based or smaller Loudspeaker can match or exceed the sound quality and quantity of a much larger driver based Loudspeaker. The laws of physics say higher frequencies don't require much air movement, but for every octave drop in the audio spectrum the driver has to be capable of moving 4 times more air to keep the same output level (loudness). Simply put, deep base requires you to move a lot of air, something a small audio driver cannot do so don't fight the real facts, just accept them. So now your considering using a 15 inch audio driver in your loudspeakers but are concerned that your loudspeakers will have too much bass and they will sound unnatural; don't worry, they won't. They will sound very similar to those quality 6.5 inch Speakers at low to mid volume levels. They will just be more capable of delivering much louder clearer bass than the 6.5 inchers when asked. They will only sound boomy if your enclosure is too small; remember keep the Qtc to 0.707. https://diyaudiospeakers.5150.ca/types.html Quote Link to comment Share on other sites More sharing options...
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