blazian87
gckless
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CarAudio.com Veteran
You've got plenty of PR planned. I am actually planning two 15's with 2 18" PR's, so you're well over what is probably needed. Not a bad thing, but it is possible to have too much PR, though I don't think you're at that point yet. Anyway, go with the 15 man. I'd do a 15" with two 15" PR's, and you'll have a nice box.
gckless
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CarAudio.com Veteran
Here's my thread bro, might have some info in it you can use:
http://www.caraudio.com/forums/enclosure-design-construction-help/572465-ported-vs-google-page-ranking-my-application.html
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blazian87
10+ year member
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- Thread Starter
- #4
Thanks alot for the input man. You're right.. two 18 PR's might be a little overkill and might be a little harder to tune. If I go with the 15" all around, how big you think my box will be around? Will I have still have a good amount of room to put stuff in my trunk?
gckless
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CarAudio.com Veteran
Box size requirements for PR are the same as ported, whatever that Q needs for net airspace. I can look it up later and get back to you, but you're probably looking at around 3.5cubes net. Not sure how big your trunk is, and you can play around with dimensions for the box as much as you want ((length x width x depth)/1728=cubic feet. Remember to take inner dimensions, not outer dimensions) since it's basically sealed in that aspect. 24x17x17 inner should give you about 3.6-ish after displacements, just to give you an idea. I think people try to stay away from perfectly cubed for a box, and try to make it at least a bit rectangular. Though I never understood this because there are plenty of good HT subs that are cubes. I'm not going to argue their experiences though.
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blazian87
10+ year member
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- #6
Yea, I got my idea of a perfectly cubed box from all the HT systems I've seen. At first I was thinking of having the sub facing rear and PR's facing front, which still might be a good idea. The thing is I sound deadened a lot of the side walls of the trunk and I wanted to take advantage of the waves bouncing off each other, maybe getting more SPL... I'm not sure what to do anymore.. I'm even more confused now.. I'm not opposed to making a rectangular box, I just want the best application for my setup while being conservative on space. The whole purpose of me doing PR's is so I can save space. If the 15" box ends up being to big, I might have to downsize to 12".. I took measurements of my trunk and it is roughly W: 47" H: 20" D: 27".. I'm trying to save a good portion of that just in case when people want to fit things in my trunk, I can still do so while keeping my sub.
gckless
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CarAudio.com Veteran
Well I do think that sub firing rear, and a PR on each side is the way to go. That way you won't need it to be super wide if you rear-fire them all, you can take advantage of the work you've already done to the side walls of the trunk, and the opposite movements of the PR's will cancel each other out. Not sure where you plan on tuning, but if you tune lower, those things can be heavy, and can move or even tip boxes when they get moving if they are on the same face. So by putting one on each side, you won't have to worry about that at all.
How big is too big to you? The dimensions I listed in my last post are about what you'll need for a 15", and I don't think that's too big, but this is your trunk, not mine. It's your call man.
In my experience with trunks PR systems I'd do the subs rear firing toward the lid and passives to the side. If you do it all one one side, just make sure the box is bolted down. Most people attach systems in trunks anyway. The whole "put passives on opposing sides" thing is more for home audio, IMO, where subs just sit on the ground. In a car if your going to bolt it down anyway, try to keep it all same side for better loading, if you can. Usually passenger side port tends to be loudest at the headrest. However, my last setup had passives on 3 sides, 2 back one on each side. Tuned at 25hz, so pretty low and it did ok.
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blazian87
10+ year member
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- Thread Starter
- #9
@gckless yea actually it's not that big.. When you said 3.5 cubes, it sounded like a lot. It might work out beautifully with the measurements you provided. How soon are you gonna get your PR setup?
@T3mpest I'm still planning to have sub firing rear and passives to the side. I'm gonna keep it in the center at all times, just maybe when I need to fit luggages or something, I will move it to one side. I'm not really trying to be the loudest, I just need it to sound good while being loud. 2000KW RMS should be plenty of power to play with. Was it very tedious to tune a PR box? You think 32hz is a good place to tune if I listen to different types of music?
@T3mpest I'm still planning to have sub firing rear and passives to the side. I'm gonna keep it in the center at all times, just maybe when I need to fit luggages or something, I will move it to one side. I'm not really trying to be the loudest, I just need it to sound good while being loud. 2000KW RMS should be plenty of power to play with. Was it very tedious to tune a PR box? You think 32hz is a good place to tune if I listen to different types of music?
Tuning a PR box is stupidly easy. Get winisd alpha and put in all the info about your subs and passives. The program can show you how much mass you need to get to your desired tuning. Once you know that simply add the metal washers to your passives.. Something to look into though is the creative sounds passive radiators.. Those passives are ALOT cheaper than the TC sound ones, have almost as much throw, and are loadable from the front. Basically the dustcap unscrews and you attach the weight from the front. You can change tuning ALOT easier that way. Anyway, tuning is mostly personal preference. Use winisd and post up some graphs. If you've never used it before, their are tutorials online, but really it's the easiest box program out, very easy.
gckless
5,000+ posts
CarAudio.com Veteran
[quote name='blazian87']@gckless yea actually it's not that big.. When you said 3.5 cubes, it sounded like a lot. It might work out beautifully with the measurements you provided. How soon are you gonna get your PR setup?
@T3mpest I'm still planning to have sub firing rear and passives to the side. I'm gonna keep it in the center at all times, just maybe when I need to fit luggages or something, I will move it to one side. I'm not really trying to be the loudest, I just need it to sound good while being loud. 2000KW RMS should be plenty of power to play with. Was it very tedious to tune a PR box? You think 32hz is a good place to tune if I listen to different types of music?[/QUOTE]
Yeah man, with the space you gave 3.5 shouldn't be a huge issue. My PR setup won't be done for a while unfortunately, funds are low and I still need to buy all my electrical and a bunch of other things. I am ordering my PR's sometime this week though. As T3mpest said, Creative Sounds has PR's that are very easy to tune randomly. From what I have seen they aren't as high quality as others, but not in the way that they fail or anything like that, just not as high performing. I'm going with PSI for mine. Talked to them, and they are setting me up with a stiffer, higher excursion (3.5" p-p, same as the TC but higher for them) pair of 18" PR's with carbon dome for $300. That's almost half of the TC's. The TC's sure are nice, but expensive. I'd email PSI before you buy and atleast ask what they can do for you. He will build almost anything, and quick too. My buddy just ordered a pair of custom Platform 3's, and they were built and shipped within a week.
Also, to quote people, you have to put a space and a ";" after the @username. So, @blazian87 ;
Edit: When tuning, be careful of where you tune. There is a deep notch, a dip, in output just below tuning. Also, a PR system will unload faster under tuning, so make sure you are using a steep SSF there.
@T3mpest I'm still planning to have sub firing rear and passives to the side. I'm gonna keep it in the center at all times, just maybe when I need to fit luggages or something, I will move it to one side. I'm not really trying to be the loudest, I just need it to sound good while being loud. 2000KW RMS should be plenty of power to play with. Was it very tedious to tune a PR box? You think 32hz is a good place to tune if I listen to different types of music?[/QUOTE]
Yeah man, with the space you gave 3.5 shouldn't be a huge issue. My PR setup won't be done for a while unfortunately, funds are low and I still need to buy all my electrical and a bunch of other things. I am ordering my PR's sometime this week though. As T3mpest said, Creative Sounds has PR's that are very easy to tune randomly. From what I have seen they aren't as high quality as others, but not in the way that they fail or anything like that, just not as high performing. I'm going with PSI for mine. Talked to them, and they are setting me up with a stiffer, higher excursion (3.5" p-p, same as the TC but higher for them) pair of 18" PR's with carbon dome for $300. That's almost half of the TC's. The TC's sure are nice, but expensive. I'd email PSI before you buy and atleast ask what they can do for you. He will build almost anything, and quick too. My buddy just ordered a pair of custom Platform 3's, and they were built and shipped within a week.
Also, to quote people, you have to put a space and a ";" after the @username. So, @blazian87 ;
Edit: When tuning, be careful of where you tune. There is a deep notch, a dip, in output just below tuning. Also, a PR system will unload faster under tuning, so make sure you are using a steep SSF there.
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OP
blazian87
10+ year member
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- Thread Starter
- #12
haha gotcha @gckless ; I know TC is overpriced but I really like their quality. I had a subwoofer by them when I was in highschool and I was amazed at how it performed. After many years of research and saving up for this, I'm not gonna let the price stop me from achieving my goal. Thanks for the advice though guys, I really appreciate the feedback. You guys helped lead me to the right path. I just pulled the trigger on the 15" Fi Q fully loaded and already having someone build a box specific for this. Can't wait to put this all together. Will have to spend countless hours tuning everything to my taste but it's all gonna be worth it. Let me know how it turns out for you. I will keep you posted on my project as well.
gckless
5,000+ posts
CarAudio.com Veteran
[quote name='blazian87']haha gotcha @gckless ; I know TC is overpriced but I really like their quality. I had a subwoofer by them when I was in highschool and I was amazed at how it performed. After many years of research and saving up for this, I'm not gonna let the price stop me from achieving my goal. Thanks for the advice though guys, I really appreciate the feedback. You guys helped lead me to the right path. I just pulled the trigger on the 15" Fi Q fully loaded and already having someone build a box specific for this. Can't wait to put this all together. Will have to spend countless hours tuning everything to my taste but it's all gonna be worth it. Let me know how it turns out for you. I will keep you posted on my project as well.[/QUOTE]
Don't get me wrong man, I didn't mean TC is overpriced, I think they are great products. I just said they were expensive. But you get what you pay for IMO.
And for an update, here's where I will probably be posting updates:
http://www.caraudio.com/forums/encl...-vs-google-page-ranking-my-application-3.html
I just paid for my PRs from PSI
Good luck with your build man!
Don't get me wrong man, I didn't mean TC is overpriced, I think they are great products. I just said they were expensive. But you get what you pay for IMO.
And for an update, here's where I will probably be posting updates:
http://www.caraudio.com/forums/encl...-vs-google-page-ranking-my-application-3.html
I just paid for my PRs from PSI
Good luck with your build man!
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