Just a quick update. I am making a Passive Radiator sub. It should be up next week. So if you want to see it, make sure your subscribed. I'll leave a build log and parts list.

123Toid I'm waiting Excitng

i would like to know this too

It's for EACH ... if you just doubled it then you'd have to sum the cone areas and suspension characteristics as well .. ok 👍

What do you mean by box fequency? Are you saying you are not getting the -3 anywhere near tuning? If so, that could mean a couple things. But the immediate thing it means is you need to raise your tuning frequency. Try changing your box size and your weights on the passive radiator to see what happens.

That is a lot of questions, lol. Let's see if we can clear them up for you. First, the 0 and -3db. The -3db is considered a speakers F3. This is the frequency where a speaker is typically 3db down from it's normal spl. This is where most people focus on, as after this you start to lose a lot of the spl past this. Secondly, he tuning frequency does not need to be the f3. However, you do need to make sure you are not tuning well below the f3. If you are you will have issues, most likely with cone excursion and resonate frequency. So it should be near, but not right at. Finally, it is much harder for an amplifier to power lower frequencies. If you take a look at individual speaker parts you will notice a spec called sensitivity. In easy terms, this relates to how much wattage a speaker needs to be driven to the same sound level as other speakers in the system. What you will notice, is that woofers and subwoofers will have a much lower sensitivity than say a tweeter. You see it takes, a lot more power to drive those speakers lower. You'll also start seeing a correlation between even the woofers. The less sensitive ones, can often have lower tuning frequencies. As far as the gap between higher and lower frequencies, that is what an L-pad is for. You use an L-pad to attenuate your tweeter to match the sensitivity of your woofer or midrange

Yeah, I know;) So, a L-pad is like a crossover? That matches that the bass has the same loundness as the tweeter.. And the F3 seems to be rly important.. Could I say that when the F3 is very low (40hz) a lot of people would say that the bass is very deep? And everything below the F3 isn`t very noticeable anymore.. ? Your a really helpful guy! Thx

A L-pad isn't a crossover, it is a filter used in a crossover. It is used to match the sensitivity of the lowest sensitive speaker, so one speaker does not play louder than the others. It is typically used on a tweeter in a two way system. The last think you want is for the tweeter to overpower you. As far as the f3 goes, most mainstream music doesn't play past 60hz. SO if you are looking for a musical speaker, an f3 of 60 is pretty good. However if you are looking at movies, you would like to have an f3 of 40 or lower. The 30hz and under range is more felt than heard. So you need bigger speakers really to reproduce those in a meaningful way. As far, as not noticeable, I guess that is one way to put it. However, we are not taking into account room dynamics. You room can actually boost or deaden certain frequencies. Having said that, you will hardly notice anything past f16. From f15-f3 you will still notice, but not nearly as much as something at 0 or f3. Basically, your speakers will probably overpower those frequencies. SO even though, they are present, they won't be heard as much.

Just a quick update. I am making a Passive Radiator sub. It should be up next week. So if you want to see it, make sure your subscribed. I'll leave a build log and parts list.

123Toid Hey! I already subscribed you! Thanks again

I’m not sure what you mean. But one thing I will say for sure is that two 5 1/2 inch passive radiators for two 7 inch subs is not going to work well. You typically want two times the volume displacement. In this case you would want four 7 inch passive radiators. Of course, that’s the assumption without actually running the calculations.

yes parts express allows you to download that for free from their site. If you need to know how to input data and exactly where to get it, check out this video for detailed information. kzfaq.info/get/bejne/hdJnfpiottiqcZs.html

the reason for this is, you can't tune a sealed box. You can only tune a ported enclosure. With a sealed box all you do is change the size of the box and that will change the response.

Thanks man! I was losing it because I thought something was wrong with the program LOL. About to watch your passive radiator video again. Any reason why you didn’t use one 8” driver with 10” passives or like one 10” with 12” passives?

@@kelvinrandolph4466 you're welcome. I don't see why that would be an issue assuming you won't reach the mechanical limits of the Pr

Cool, thanks!

@@Toid One last quick question: In this video, you only modeled 1 driver and one passive radiator, but when you did the build, you had two passive radiators. Should the model in WinISD have had 2 passive radiators to equal the build? Just making sure I'm entering the data right. I'm getting really a really high f3.

There is no way, that I know of. If you have a microphone like the umik1, you can use REW, to get a baseline in the enclosure you are using. Then adjust with weight and enclosure size as needed. It's a lot more work, but it's one of the only ways I know of. This is one of the reasons I try to steer away from Ebay when buying passive radiators. But you usually can't beat the price!

123Toid Thanks for your answer. I bought the PR on ebay because I couldn't find any with a diameter of arrourd 1.5". Do you know any seller that sells small PR with a datasheet? I can't find anyway to design my enclosure on winisd without theses specs.

+Pierre Dal Busco Typically you won't find much below about 3.5" with specs. Mainly, this is due to you needing about double the air movement of your passive radiator compared to your speakers. So a 1.5" passive radiator would typically pair with around a 3/4" speaker l. and that type of speaker will not get very low. However, you may be able to find some small passive radiators that will work. I'd check out Ali Express. If the specs aren't listed, sellers will often get them for you. You will have to email the seller though. I hope this helps.

Just a quick update. I am making a Passive Radiator sub. It should be up next week. So if you want to see it, make sure your subscribed. I'll leave a build log and parts list.

I really don't know a good way. You would end up needing some measurement equipment along with some trial and error. I would start with around the same size as a ported enclosure. Then continue to add weight to the passive radiators until you get your desired result.

@@Toid hi! Thank’s - I will try

Yes you can

Bob Richards that's all explained in the video. assuming you have the specs, the program will help you adjust both the box size and added mass hat will get you the response you are attempting to get. BUt in short, the answer is no.

Just a quick update. I am making a Passive Radiator sub. It should be up next week. So if you want to see it, make sure your subscribed. I'll leave a build log and parts list.

No you don't. But since this video, I have actually switched to the altest version. That version is available for download from their facebook page. Just google winisd facebook.

123Toid Thanks man

Crazy Experiments You're Welcome

i just downloaded the 0.7.0.950, so lets see if i can figure it out :)

123Toid I have problem when I need to choose a alignment it says: none available. What do i do?